SEARCHING: IAG
G01 Reference Systems and Frames
Convener(s): Christopher Kotsakis (Greece)Co-Convener(s): Geoff Blewitt (USA) Johannes Boehm (Austria) Xavier Collilieux (France) Susanne Glaser (Germany)
Description
Reference systems and frames are of primary importance for scientific research, satellite navigation, and geospatial applications. A precisely defined and accurate reference frame improves our understanding of the Earth’s system and its time variations, including Earth’s variable rotation and gravity field, sea level changes and their global environmental impact, tectonic plate motion, glacial isostatic adjustment, geocenter motion, deformation due to the earthquake cycle, terrestrial water storage, ice-sheet melting, ocean and atmospheric loading, and volcanism. An accurate reference frame is also needed to position GNSS, SLR and DORIS satellites, and any Earth observation satellite or aircraft with geodetic sensors such as those used for ocean and ice-sheet altimetry, InSAR, gravimetry, and LiDAR. Furthermore, self-consistency is required to connect the terrestrial frame, celestial frame, and Earth rotation to realize the inherent stability in orientation and scale provided by VLBI quasar observations. Co-location, whether it be on the ground or in space as planned with VLBI transmitters on satellites, is essential to tie the various space geodetic techniques together into one consistent global reference system to be used for Earth monitoring. For this symposium, we solicit presentations dealing with theoretical aspects of reference systems and the practical realization of the celestial, global and regional terrestrial reference frames, as well as their various applications like those mentioned above, and beyond. The contributing role of space geodetic techniques in the realization of the origin and scale of global frames through new and improved modeling of their systematic errors and novel exploitations of LEO satellites is also a topic of great interest for this symposium. We also solicit presentations on new and emerging technologies applicable to the future of reference frames such as inter-satellite links, as well as relativistic and quantum geodetic sensors.
Go to the top of the page
G02 Static Gravity Field and Height Systems
Convener(s): Laura Sanchez (Germany)Co-Convener(s): Hussein Abd-Elmotaal (Egypt) Roland Pail (Germany) Elmas Sinem Ince (Germany)
Description
Global and regional static gravity field models of high accuracy and spatial resolution encapsulate important information for a wide range of applications. They are essential for the unification of existing height systems and the establishment of an International Height Reference System (IHRS), inertial navigation, the derivation of the mean dynamic ocean topography and geostrophic ocean currents (in combination with satellite altimetry), and also for constraining geophysical models of lithospheric structures. Input to these models are satellite-based data, especially from dedicated space missions such as CHAMP, GRACE, GOCE, other low Earth orbiters, and next-generation missions in the future, satellite altimetry, and ground, air- and shipborne data. An essential element of such model developments is the availability of global digital topographic models. The error assessment of global and regional gravity solutions is of equal importance to the signal information. Modern developments of sensor technology both, for ground- and satellite-based systems, and new measurement concepts, such as quantum gravimeters and optical clocks, will complement and support gravity campaigns and networks using absolute, superconducting and other relative gravimeters. This session solicits contributions on all aspects of global and regional high resolution gravity model developments and assessment. We also seek contributions on effective parsimonious representations of gravity model functionals, geophysical and oceanographic applications, as well as mission concepts, instrumentation and processing strategies for future gravity field missions. A further main topic of this symposium is the determination of modern height systems, especially the precise geoid modelling, the establishment of the International Height Reference Frame (IHRF), and theory and methods for the vertical datum unification.
Go to the top of the page
G03 Time-variable Gravity Field
Convener(s): Adrian Jaeggi (Switzerland)Co-Convener(s): Srinivas Bettadpur (USA) Frank Flechtner (Germany) Shuanggen Jin (China)
Description
The time-variable Earth’s gravity field is related to the mass transport and the physical processes within Earth’s system (including the atmosphere, oceans, hydrology and cryosphere), such as melting of ice sheets and glaciers, ocean circulation and sea level variations, hydrological cycle, post-glacial rebound and earthquake-induced gravity change. Satellite gravimetry missions, particularly the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-on, have provided new insights at unprecedented accuracy and resolution, which has been widely used to investigate mass flux within the ocean-land water cycle and Earth’s system coupling as well as responses to climate change together with complimentary data from other space missions, such as Jason-1/2, ICESat, Cryosat-2, GNSS, and InSAR. This interdisciplinary session solicits contributions on (1) time-varying gravity field estimation and improvement from satellite gravimetry missions and combination synergies, (2) extraction and interpretation of mass transport in the Earth system and responses to climate change, and (3) ideas and for innovations for in future time-varying gravity field measurement missions.
Go to the top of the page
G04 Earth Rotation and Geodynamics
Convener(s): Janusz Bogusz (Poland)Co-Convener(s): Chengli Huang (China) Severine Rosat (France) Michael Schindelegger (Germany)
Description
This session discusses recent progress of the studies of Earth rotation and geodynamics using geodetic techniques. Relevant geophysical phenomena include those associated with changes in Earth’s shape, gravity field and rotation. These include the wide spectra of observational/analytical/theoretical studies of Earth rotation and orientation such as polar motion, Universal Time or length of day, precession and nutation, critical parameters for transformation between terrestrial and celestial reference frames at the mm level required by GGOS. Measurements of Earth’s static and time-varying gravity field from space-based and ground-based sensors, including comparison of results to models. We encourage researchers to contribute early results from the GRACE Follow-on mission. In terms of solid Earth deformation, relevant research includes those related to tidal processes (solid Earth and ocean loading tides), Earth’s free oscillations, crust and mantle deformation due to tectonic motions and isostatic adjustment etc. as well. Studies with traditional techniques and historical data are also encouraged to be contributed.
Go to the top of the page
G05 Multi-signal positioning, Remote Sensing and Applications
Convener(s): Kealy Allison (Australia)Co-Convener(s): Zaminpardaz Safoora (Australia) Wielgosz Pawel (Poland) Beata Milanowska (Poland)
Description
Positioning applications are, today, as diverse as they are vast. They can be done using just a single signal from a single system but more often they are done merging multiple signals from distinct systems, including, at times, signals of opportunity. Among the applications are the ones that perform remote sensing of the environment from where signals propagate, either below, near or above the Earth’s surface, including its atmospheric layers, either land-based, airborne or from space. This symposium focuses on theoretical and practical advancements as well as innovative applications and architectures for multi-signal positioning, remote sensing and applications. We invite the submission of papers that address, navigation, timing and guidance systems for autonomous vehicles, intelligent transport systems, personal mobility, and other safety and liability critical applications. Indoor positioning systems and sensors and solutions for positioning in GNSS difficult environments. Alternative positioning technologies and techniques including collaborative positioning and innovative integration architectures. Positioning using low-cost sensors including GNSS and smartphone sensors, geospatial mapping and engineering, ranging from construction work, geotechnical and structural health monitoring, mining, to natural phenomena such as landslides and ground subsidence. Geodetic applications and high-precision GNSS technologies and applications and the use of multi-signals stemming from modernized signals and issues and opportunities coming from multi-constellation signals. In delivering multi-sensor systems numerous challenges emerge. This symposium welcomes any topic that addresses these challenges.
Go to the top of the page
G06 Monitoring and Understanding the Dynamic Earth with Geodetic Observations
Convener(s): Basara Miyahara (Japan)Co-Convener(s): Detlef Angermann (Germany) Allison Craddock (USA) Hansjörg Kutterer (Germany)
Description
Geodetic observations of the Earth’s shape, rotation, and gravity show that these Earth properties change on a wide range of timescales reflecting the wide range of processes affecting them, from external tidal forces to surficial processes involving the atmosphere, oceans, and hydrosphere to internal processes acting both at the core-mantle boundary as well as within the solid Earth itself. Measurements of the Earth's shape, rotation, and gravity can therefore be used to gain greater understanding of mass transport within the entire Earth system, from tracking water in its various phases as it cycles through the atmosphere, oceans, and land, to crustal deformation associated with tectonic motions and glacial isostatic adjustment, to torsional, rotational, and inertial oscillations of the core. Geodetic observations provide the basis on which future advances in the geosciences can be built. By considering the Earth system as a whole (including the geosphere, hydrosphere, cryosphere, atmosphere and biosphere), monitoring Earth system components and their interactions by geodetic techniques and studying them from the geodetic point of view, the geodetic community provides the global geosciences community with a powerful tool consisting mainly of high-quality services, standards and references, and theoretical and observational innovations. Earth observations are needed not only for scientific research but also for societal applications such as disaster prevention and mitigation, managing resources like energy, water, and food, mitigating the effects of climate change, and protecting the biosphere, the environment, and human health. Geodetic observations provide the metrological foundation for Earth observations and provide the means to determine mass transport in the Earth system. Geodetic observations are therefore a cornerstone of the Earth observing systems needed for scientific research and societal applications. This Symposium will highlight the importance of geodetic observations to monitoring and understanding the dynamic Earth system for the benefit of both science and so
Go to the top of the page
JOINT
JA03 Analogue Data for the Future: Preservation and Present-Day Utilization of Historical Data in the Geosciences (IAGA, IACS, IASPEI, IAHS, IAG, IAPSO)
Convener(s): Ciarán Beggan (UK, IAGA)Co-Convener(s): Lauren Vargo (New Zealand, IACS), Kirsten Elger (Germany, IAG), Hisashi Hayakawa (Japan/UK, IAGA), Alberto Viglione (Italy, IAHS), Satheesh S.C. Shenoi (India, IAPSO), Josep Batlló Ortiz (Spain, IASPEI), Kristine Harper (Denmark, IAMAS), Roberto Carniel (Italy, IAVCEI)
Description
In many areas of geophysical and geological studies, long running measurements at a fixed location or over a wider region exist in analogue (physical) form including, amongst others, on photographic paper, in journals or as published tables. It is highly advantageous to convert analogue records to digital values, allowing modern computational techniques and analysis to be applied. However, it is often challenging to convert analogue records as formatting, the type of information recorded, accompanying metadata, and unit metrics change over time. Campaigns to digitize temperature or climate-related measurements have been very successful, especially with the recruitment of keen citizen scientists. However, more scientific formats, such as graphs with technical information or notation, are less amenable to generalist help. Historic analogue records frequently offer significant scientific implications, forming a baseline for analyses of long-term variability and/or short-term extreme hazards in multiple scientific aspects. In this context, it is important to compare these analogue records with one another and document their individual instrumental details for cross-calibrations. This session looks at methods for preservation, extraction, and analysis of historic analogue records, including by manual, image processing or machine learning techniques. This session also accommodates documentation of instrument detail and calibration methods for historical observations. This session welcomes new analyses using data that have previously been in analogue form, and case studies of long-term geophysical variability or individual short-term extreme events. We seek submissions from across all associations.
Go to the top of the page
JA04 Marine Geodesy and Geophysics – Opportunities & Hazards (IAGA, IAG, IASPEI, IAVCEI)
Convener(s): Sebastian Hölz (Germany, IAGA)Co-Convener(s): Valérie Ballu (France, IAG), Heidrun Kopp (Germany, IASPEI), Paraskevi Nomikou (Greece, IAVCEI)
Description
More than 70% of the Earth surface is covered by ocean. The seafloor is the critical interface where geology, climate, ecosystems, and human activities converge. Yet, a high percentage of the ocean’s seafloor and the subsurface below the seafloor remain unexplored and is both a source of opportunities in terms of unexplored resources (e.g. massive sulfides and hydrothermal fluids) as well as hazards (e.g. due to earthquakes, tsunamis, volcanoes or the exploitation of marine mineral resources). A responsible and sustainable use of resources and mitigation of geohazards require an enhanced knowledge about short- and long-term processes that shape the current sea floor, as well as about its role in the Earth System. Innovative methods help us to better identify and monitor structures, which can be related to geohazards as well as resources. This session invites all contributions of marine geophysical and geodetic research ranging from small to large scales aimed at characterizing structures and dynamics of the Earth’s interior and the seafloor. Solicited fields of research include instrumentation, survey design, data acquisition and novel data processing, visualization, modeling and interpretation procedures. We invite contributions from various fields of offshore geophysical investigations including seismological and seismic, electromagnetic methods as well as contributions from seafloor geodesy.
Go to the top of the page
JG01 Interactions of the Solid Earth With Ice Sheets and Sea Level (IAG, IACS, IASPEI)
Convener(s): Rebekka Steffen (Sweden, IAG/IASPEI)Co-Convener(s): Bert Wouters (Netherlands, IACS), Natalya Gomez (Canada, IAG/IACS), Lambert Caron (US, IAG), Doug Wiens (US, IASPEI)
Description
Measurements of solid Earth, sea-level and ice-sheet changes are influenced by a complex interaction of processes occurring over a large range of spatial and temporal scales. Present-day observations of solid Earth deformation in a given location are influenced by present and past changes in global surface loading, and these deformations play an important role in controlling ice-sheet changes in turn. Furthermore, observations that constrain past ice sheets are affected not only by glacial isostatic adjustment, but also by changing mantle dynamic topography and tectonic processes. In addition, applied geophysical investigations are revealing crucial spatial variations in Earth rheology, which again affect the deformation of the solid Earth. In this symposium, we showcase model- and data-driven efforts to understand feedbacks between surface load changes and the solid Earth over all timescales and observation types.
Topics covered by the Symposium:
- observations of mass changes in the cryosphere and oceans, and their interaction with solid Earth deformation
- influence of glacial isostatic adjustment on paleo and modern observations of sea level or ice sheet behavior
- seismicity induced by ice-mass and sea-level changes
- geophysical studies of the rheology of the solid Earth in the context of sea-level and ice-sheet studies
Solicited speakers: Tanghua Li (Earth Observatory of Singapore) and Terry Wilson (Ohio State University)
Go to the top of the page
JG02 Theory and Methods of Potential Fields (IAG, IAGA)
Convener(s): Dimitrios Tsoulis (Greece, IAG)Co-Convener(s): Sten Claessens (Australia, IAG), Maurizio Fedi (Italy, IAGA)
Description
Heterogeneous data sets of increasing spatial resolution describing the shape and structure of the Earth and other celestial bodies as well as their gravity and magnetic fields are currently available. This brings about new developments in the theory and methods of potential fields. Densely sampled Digital Elevation Models, global crustal models and an abundance of potential field models up to and beyond degree and order 5480 provide a dynamic framework for revisiting and updating the methodological apparatus that deals with all aspects of the theoretical description and numerical evaluation of potential functions and their spatial derivatives. The symposium welcomes contributions that fall into this topic and deal with new theoretical or methodological advances in modeling and evaluating potential fields for geodesy and geophysics. Terrain modeling and reductions at all spatial scales, spherical harmonic analysis and synthesis, spheroidal and ellipsoidal harmonics, ultra-high degree and order expansions, and analytical, numerical and multiresolutional techniques in potential field modeling are some of the encouraged keywords. Also welcomed are contributions that deal with source modeling through joint or separate inversion of potential fields.
Go to the top of the page
JG03 Remote Sensing and Modelling of the Atmosphere (IAG, IAGA, IAMAS, IAVCEI,)
Convener(s): Michael Schmidt (Germany, IAG)Co-Convener(s): Ehsan Forootan (Denmark, IAG), Loren Chang (Taiwan, China, IAGA), Claudia Stubenrauch (France, IAMAS), Fabio Dioguardi (Italy, IAVCEI)
Description
Satellite observations provide a continuous survey of our planet’s surrounding atmosphere, which is structured into distinct layers, according, e.g. to temperature or charge state.
Space weather effects are observed in the magnetosphere, ionosphere, plasmasphere and thermosphere; its impacts and risks are gaining more and more importance in politics and sciences, because the demands of communications and precise positioning are ever increasing in the modern society.
Stratosphere and troposphere and their constituents are essential for life on our planet, and tropospheric water vapour is source of clouds and precipitation, which in turn affect the large-scale circulation through heat transfer. Radiative forcing induced by external factors like changes in aerosol and greenhouse gas concentrations leads to feedbacks which are still an important uncertainty source in modelling climate change. The synergistic use of different instruments and modelling is leading to major advances in the understanding of our climate.
This symposium invites contributions on advances in observing, modelling, and understanding our atmosphere – from troposphere to magnetosphere. Specific topics are:
- (near) real-time approaches to monitor and forecast the atmospheric state
- combination of various observation techniques and improvement of the representation of atmospheric key parameters in models
- monitoring the Earth by Global Navigation Satellite Systems (GNSS) and other measurement techniques
- studies on space weather research and coupling processes in the upper atmosphere
- aerosol, cloud, precipitation and radiation processes as well as interactions in the climate system
- data assimilation, model-data fusion, and artificial intelligence techniques for advancing modelling and prediction of atmospheric variables
- use of synergetic satellite observations and modelling for a better understanding of cloud processes and feedbacks
Possible Sessions:
1. Upper Atmosphere: Ionosphere, Thermosphere, Plasmasphere, Magnetosphere
2. From Ionosphere to Troposphere
3. Lower Atmosphere: Monitoring the Earth by Global Navigation Satellite Systems and other measurement systems
4. Lower Atmosphere: Water Vapour, Clouds, Precipitation and Radiation
5. Lower Atmosphere: Monitoring of anthropogenic and natural aerosols and their radiative forcing
Go to the top of the page
JG04 Satellite Gravimetry for Groundwater Monitoring (IAG, IAHS)
Convener(s): Adrian Jäggi (Switzerland, IAG)Co-Convener(s): Andreas Güntner (Germany, IAG), Felipe de Barros (Brazil/USA, IAHS), Michelle Newcomer (USA, IAHS)
Description
Groundwater is one of the most important freshwater resources for mankind and for ecosystems. Assessing groundwater resources and developing sustainable groundwater management plans are major fields of activity for science, water authorities and consultancies worldwide. To this end, sound data on the status of groundwater level and storage and of their changes is required. GRACE and GRACE-FO satellite gravimetry provides a unique capability to monitor subsurface mass transport and thus large-scale groundwater storage variations. In this symposium we gather the latest developments in the field of groundwater monitoring by satellite gravimetry. Contributions are solicited that that address improved GRACE/GRACE-FO processing strategies towards groundwater applications, methods for separating out groundwater storage variations from the total water storage observed by GRACE/GRACE-FO, evaluations of gravity-based groundwater storage against independent data sets, case studies of gravity-based groundwater resources assessments with or without combination with complementary data sets and models, developments of gravity-based groundwater products and services, among others.
Go to the top of the page
JG05 Geodesy for Climate Research (IAG, IAMAS, IACS, IAPSO, IAHS)
Convener(s): Annette Eicker (Germany, IAG)Co-Convener(s): Bert Wouters (Netherlands, IACS), John T Reager (USA, IAHS), Adam Scaife (UK, IAMAS), Benoit Meyssignac (France, IAPSO)
Description
This symposium is dedicated to the use of geodetic measuring techniques for innovative climate and Earth system studies. Modern geodetic observing systems document a wide range of changes in the Earth’s solid and fluid layers at very different spatial and temporal scales related to processes as, e.g., the terrestrial and atmospheric water cycle, ocean and atmosphere dynamics, sea level, ice-mass balance, and glacial isostatic adjustment. Different time spans of observations need to be cross-compared and combined to resolve a wide spectrum of climate-related signals. Geodetic observables are also often compared with geophysical models and climate models, which helps to explain observations, test theories, evaluate simulations, and finally merge measurements and numerical models via data assimilation. We appreciate contributions utilizing data from diverse geodetic observation techniques including altimetry and gravimetry satellites, navigation satellite systems, satellite radio occultation and reflectometry, InSAR, VLBI, tide gauges, or remote sensing. We welcome studies that cover a wide variety of applications of geodetic measurements and their combination to observe and model Earth system signals in hydrological, ocean, atmospheric, climate and cryospheric sciences. Any new approaches helping to separate and interpret the variety of geophysical signals are equally appreciated. Contributions working towards any of the goals of the Inter-Commission Committee on "Geodesy for Climate Research" (ICCC) of the International Association of Geodesy (IAG) are very welcome in this symposium.
Go to the top of the page
JG06 Monitoring Sea Level Changes by Satellite and In-Situ Measurements (IAG, IAPSO)
Convener(s): Xiaoli Deng (Australia, IAG)Co-Convener(s): Steve Nerem (USA, IAG), Fabio Raicich (Italy, IAPSO)
Description
Monitoring sea level changes at regional and global scales allows better understanding the climate system and supporting the design of adaption strategies to climate change. Sea level has been mainly measured by tide gauges and satellite altimeters. Coast-based tide gauge stations from around the world have for more than a century provided high temporal sea level records. Their number and lengths are being increased by sea-level data archaeology activities committed to discover and recover past observations. Satellite altimeters have been observing nearly global sea surface heights with revisit (or non-revisit) periods since the early 1990s. In addition, the spaceborne Global Navigation Satellite System Reflectometry (GNSS-R) has provided an alternative sea level monitoring method. Data availability from the Gravity Recovery and Climate Experiment (GRACE) mission since 2002 and from the Argo system of autonomous profiling floats since 2005 allows to estimate the thermal expansion and mass transfer components in sea level rise. This IAG-led Joint JG6 Symposium invites researchers to present their studies in monitoring and observing sea level changes over multiple spatial and temporal scales using data from satellite altimetry, satellite gravimetry, GNSS-R, tide gauges, Argo and in-situ techniques.
Go to the top of the page
JG07 Modern Gravimetric Techniques for Geosciences (IAG, IAVCEI, IAPSO, IASPEI)
Convener(s): Jürgen Müller (Germany, IAG)Co-Convener(s): Chris Hughes (UK, IAPSO), Rudolf Widmer-Schnidrig (Germany, IASPEI), Emily Montgomery-Brown (USA, IAVCEI)
Description
New tools for gravimetric Earth observation on ground and in space are being developed in quantum physics that enable novel applications and measurement concepts in the geosciences. We invite presentations to illustrate the principles and state of the art of these novel techniques, like quantum gravimetry, relativistic geodesy with clocks or chronometric levelling, advanced intersatellite tracking and others. These advanced techniques will open a door to a vast bundle of applications. Terrestrial mass variations can be monitored at various scales providing unique information on the related climate change processes. We especially welcome presentations on further applications of those new methods in the geosciences. For example, quantum gravimeters are beneficial for monitoring mass changes, e.g. at volcanos or of the local groundwater. Clock networks provide differences of physical heights and can monitor mass and height variations, e.g., at tide gauges, to disentangle land deformation and sea level rise. Based on that advanced quantum technology, improved observation of mass changes from space will give access to smaller (but relevant) effects like those related to permafrost thawing.
Solicited speaker: Daniele Carbone (INGV - Sezione di Catania, Osservatorio Etneo, Italy) - Experimentation of new technologies for volcano gravimetry at Mt. Etna
Go to the top of the page
JH04 Anthropocene: Perspectives From and Within Geophysics (IAHS, IAMAS, IACS, IASPEI, IAVCEI, IAG, IAPSO)
Convener(s): Christophe Cudennec (France, IAHS)Co-Convener(s): Richard Essery (UK,IACS), Melita Keywood (Australia, IAMAS/iCACGP), Mark Lawrence (Germany, IAMAS/iCACGP), Domenico Giardini (Switzerland, IASPEI), Roberto Sulpizio (Italy, IAVCEI), Catia Domingues (UK, IAPSO)
Description
As the International Union of Geological Sciences considers the Anthropocene from a stratigraphic perspective, and as other communities are considering a wider definition (see the ICSU-ICS intermediate synthesis in 2016, https://www.sciencedirect.com/journal/global-environmental-change/vol/39/suppl/C) IUGG has to reconsider the concept and to renew its contribution. This session welcomes any communication in that perspective, including about great acceleration, planetary boundaries, change detection and attribution, climate change and other changes to the atmosphere-ocean-cryosphere-hydrosphere system, such as erosion-sedimentation, man-induced seismicity and man-driven geomorphology, along with related farther-reaching topics such as One Health; and assessing these issues and science-informed policy options for mitigation and adaptation together with the socio-geosciences.
Go to the top of the page
JH06 Education & Outreach in Geosciences (IAHS, IASPEI, IAGA, IAG, IAVCEI, IACS, IAMAS, IAPSO)
Convener(s): Christophe Cudennec (France, IAHS)Co-Convener(s): Fabien Maussion (Austria, IACS), Markku Poutanen (Finland, IAG), Katia Pinheiro (Brasil, IAGA), Tereza Kameníková (Czech Republic, IAGA), Thomas Spengler (Norway, IAMAS), Angela Pomaro (Italy, IAPSO), Raju Sarkar (Bhutan, IASPEI), Natalia Pardo (Colombia, IAVCEI)
Description
Sharing scientific knowledge and methods through education and outreach is of high importance to support the societal transition in terms of sustainability, development, and security. Initial and life-long education, training in operational services, and capacity development within institutions and society are facing many challenges, when dealing with environmental and societal changes, disaster risk reduction, and the evolution of techniques along the data – information – knowledge – decision support chain. This symposium welcomes conceptual developments as well as practical study cases from geoscientists, as well as from didacticians and knowledge brokers. The variety of approaches across disciplines and across the diversity of the geosciences will provide a collective overview on education and outreach activities the basics and variants in our fields. The symposium also encourages sharing of lessons learned from the enhanced digitization induced by the pandemic and from the ongoing digital revolution, showcasing perspectives of the knowledge society and the Open Science paradigm.
Go to the top of the page
JS03 Probing the Earth’s Lithosphere: Understanding Tectonic, Volcanic, Cryotonic and Geodynamic Processes Using Geophysical Methods (IASPEI, IAG, IAGA)
Convener(s): Uli Achauer (France, IASPEI)Co-Convener(s): Holger Steffen (Sweden, IAG), Foteini Vervelidou (France, IAGA)
Description
The emergence of many new high-resolution datasets in almost all different disciplines of geosciences over the last two decades further emphasized that most geoscientific objects are so complex, that only interdisciplinary efforts and combination of datasets provide a pathway to decipher their complex structures and variability with time.
Cratonic domaines, hotspot track systems, rifted continental margins, subduction zones, continental baby plumes, intraplate seismicity, coastal subsidence, and impact cratering are just few examples of such processes pertaining in particular to Earth's lithosphere. In this symposium we welcome studies which shed new light on the evolution and geodynamic development of complex geological processes and structures of Earth's lithosphere using geophysical methods. Terrestrial and space-borne studies making combined use of data from different fields in earth sciences, e.g., potential fields like magnetic field and gravity, tectonics, geochemistry, and structural geology, as well as studies including geodynamic modelling are especially welcome. We further invite presentation on multidisciplinary national and international research infrastructures for integrated use of data and their products.
Solicited speakers:
Magdala Tesauro (University of Trieste, Italy) will present her work on the collisional phase of young orogens using numerical simulations and observations in the Zagros Collisional Zone.
Hanjin Choe (Pusan National University, South Korea) will present his work on the effects of hydrothermal circulation at subduction zones on the magnetization of oceanic crust using geodynamic modeling.
Go to the top of the page
JS04 Monitoring, Imaging and Mapping of Volcanic Areas (IASPEI, IAG, IAVCEI, IAGA)
Convener(s): Thomas Walter (Germany, IASPEI)Co-Convener(s): Ronni Grapenthin (USA. IAG), Takeshi Hashimoto (Japan, IAGA), Federico Lucchi (Italy, IAVCEI)
Description
Over 1500 volcanoes are considered active, and are in reach of an estimated 10% of the global population. Volcanoes are curse and blessing for the population, as they are a source of significant hazards difficult to predict, and provide fertile soil and exploitable resources. Thanks to field-constrained eruptive histories of active centers and improved instrumental monitoring on the ground, complemented by high resolution remote sensing and complex modelling, the involved time scales, dimensions of volcanic processes and diversity in eruptive style are much better understood. All this allows identifying the internal structure and unrest, intrusion of magma in reservoirs and dikes, hydrothermal activity and degassing at the surface, and material transport processes to distance. Despite these advances, significant volcano eruptions and location is unpredictable, and the duration, rates, or scale remain largely speculative, as vividly demonstrated for the recent eruptions at Nyiragongo (DR Congo), at Hunga Tonga (SW Pacific), Fagradallsfjall (Iceland), or at La Palma (Canary Islands), and elsewhere. The aim of this joint symposium is to bring together scientists elaborating volcanic areas using monitoring, imaging and modelling techniques, to better understand the past, present, and future of volcanoes, and to access the hazards and benefits of volcanic areas. In particular, we invite contributions using broad techniques from geophysical imaging, seismology, geodesy, as well as from active and passive remote sensing, geochemistry, gas analysis and petrology, in order to exchange on how volcanoes prepare for eruptions, undergo unrest, hydrothermally exhalate during periods of quiescence, and evolve in the short and long term. Moreover, interaction of volcanoes and their surrounding will be discussed in this symposium, trying to better understand and exchange on the role of the tectonics, glaciers, earthquakes, ocean, and climate.
Go to the top of the page
JS05 Real-Time GNSS Data and Products Usage: Interoperability and Management Challenges (IASPEI, IAG, IAVCEI, IAPSO)
Convener(s): Angelo Strollo (Germany, IASPEI)Co-Convener(s): Antonio Avallone (Italy, IAG), Yuhe Tony Song (USA, IAPSO), Clinton John (Switzerland, IASPEI), Giuseppe Puglisi (Italy, IAVCEI)
Description
The Internet of Things continues to expand with reduced restrictions throughout the Urban Space and enables reliable and simple real-time data streaming even from very remote areas. Such technological developments, alongside the growth in cloud computing, have enabled real-time streaming of GNSS data and products. GNSS data today has mature standards (i.e. RTCM formats) for a wide spectrum of applications (civil and military navigation, science, commercial purposes). On the other hand, GNSS products are domain-specific, requiring expertise of scientists and technical personnel. In the last decade, real-time GNSS products have offered new opportunities for monitoring natural hazards in real-time (i.e. earthquakes, volcanoes, landscapes). To become widely available within existing domain specific processing pipelines these products must be available via standard formats and services. A typical example is real-time satellite orbit and clock data which enables several real-time positioning flavours, from standard precise point positioning and relative positioning to regional augmentation and seismic and geodetic data fusion. These products, available in real-time and via standard formats and services (e.g., seedlink and mseed for seismology) could be game changers within the context of early warning systems for tsunamis, landslides, volcanoes, and other natural disasters, as well as for infrastructural monitoring. This interdisciplinary symposium welcomes contributions outlining recent developments in real-time GNSS applications, in particular the usage of real-time data and products within the geophysics domain. This includes: processing techniques developed for real-time products, augmentation through the addition of new data; data management policies; use case examples, in particular those fostering interoperability; adoption or development of new standard formats. The aim of the symposia is to remove the barriers between scientific domains, foster interoperability, and to welcome discussions that lead towards interdisciplinary technical discussions around common formats and interoperability.
Go to the top of the page
JS06 Joint Inversion of Different Geophysical Data Sets (IASPEI, IAGA, IAG, IAVCEI)
Convener(s): Christel Tiberi (France, IASPEI)Co-Convener(s): Mareen Lösing, (Germany, IAG), Max Moorkamp (Germany, IASPEI/IAGA), Alexander Grayver (Switzerland, IAGA), Luca D'Auria (Spain, IAVCEI)
Description
The Earth is composed of various materials with different physical properties. Therefore understanding its structure and dynamics requires a combination of multiple observations and complementary tools. For decades now, the joint use of different geophysical and geological datasets in inversion or modelling has become a popular way of investigating Earth structure and dynamics at many different scales. In this symposium, we will address all aspects of research that utilize the combination of multiple datasets in multiple parameter inversion or modelling. This includes methodological concepts to improve the performance of integrative imaging, innovative applications and case studies of these techniques, theoretical developments and multi-scale approaches. We welcome contributions from all disciplines that use data integration for a better quantitative understanding of the structure and dynamics of the Earth, from the subsurface down to its core.
Go to the top of the page
JS07 Geophysical Constraints on the Earth’s Deep Interior Combining Modelling and Observations (IASPEI, IAGA, IAG, SEDI)
Convener(s): Jérémy Rekier (Belgia, IASPEI)Co-Convener(s): Carla Braintenberg (Italy, IAG), David Cebron (France, IAHS)
Description
This symposium aims to bring together contributions from different fields aiming to elucidate the physics of the deep Earth, in particular the Core-Mantle interactions. Recent satellite missions GRACE, GOCE and SWARM have provided invaluable data that can be used to constrain the planet’s deep interior dynamics and physical state. Combined with geodetic and seismic observations, these can be used to constrain the existence of density stratification in the outer core which would affect models of geodynamo, and long-term thermal evolution. With the addition of magnetic observations, magnetohydrodynamics models can be employed to constrain the electric conductivity near the CMB and its direct effect on the Earth’s nutation and length of Day. We also welcome contributions concerning the inner core composition and dynamical interactions with the outer core and mantle.
Go to the top of the page
JV06 Geophysics of Solar System Planets (IAVCEI, IASPEI, IAG, IAGA)
Convener(s): Alessandro Bonforte (Italy, IAVCEI)Co-Convener(s): Kumiko Hori (Japan, IAGA), Philippe Lognonné (France, IASPEI)
Description
Observations of the distribution, form, and composition of planetary bodies, where subduction, erosion, and vegetation does not obscure surface features. In this session we invite all contributions relating to planetary geology and geophysics, encompassing remote sensing, geomorphology, in-situ or orbital geophysics, sample-based, experimental and numerical modelling, and Earth-analogue studies that utilize planetary data to provide a deeper understanding of this fundamental planetary process.
Go to the top of the page