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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20260401T160000
DTEND;TZID=Europe/Rome:20260401T170000
DTSTAMP:20260424T083009
CREATED:20260331T041343Z
LAST-MODIFIED:20260331T041343Z
UID:34871-1775059200-1775062800@geodesy.science
SUMMARY:Hydrologic Signature in Geodetic Observations
DESCRIPTION:Dear Colleagues\, \nWe are pleased to announce our second seminar for our series\, hosted by the International Association of Geodesy (IAG) Working Group 3.1: Hydrologic Signature in Geodetic Observations\, given by Wenjin Chen\, Assistant Professor at Jiangxi University of Science and Technology\, China. This seminar will be held on April 1 at 10:00 EDT/ 7:00 PDT/ 16:00 CET/ 23:00 CST. \nJoin the webinar:\nhttps://iu.zoom.us/j/82304710308\nMeeting ID: 823 0471 0308 \nTitle: Algorithms and Software for efficient Gravity forward modeling of hydrological mass changes \nAbstract: Gravimetric forward modeling is a fundamental tool in physical geodesy and gravimetric geophysics to model the gravitational potential and its derivatives from a prescribed subsurface density distribution. This paper presents a systematic review and unified formulation of forward modeling algorithms in Cartesian and spherical coordinate systems\, defined in both spatial and spectral domains. In the Cartesian coordinate framework\, analytical and numerical expressions are provided for a simple representation of volumetric mass elements that include point mass\, vertical line mass\, horizontal mass layer\, and prism as well as for more complex and generalized representations involving volumetric mass bodies bounded by variable upper and lower interfaces and volumetric mass bodies with arbitrary geometries and heterogeneous density distribution. In the spherical coordinates\, expressions are given for prism and tesseroid together with two spectral domain approaches involving tesseroid modeling combined with spherical harmonic analysis and concentric-shell method suited for arbitrary mass geometries. Numerical experiments\, based on using digital terrain model of Tibet and Himalaya\, demonstrate that compared to prism method\, simple point and line mass approaches reproduce only the long-wavelength gravity field\, with gravity differences typically up to about 12 mGal and gravity gradient discrepancies about 0.45 E\, whereas the horizontal layer method agrees with the prism gravity solution within ±0.01 mGal and approaches almost zero differences for gravity gradient solutions. Models with variable interfaces or full arbitrary geometries can deviate by 8 mGal in regions with extremely complex topography\, underscoring necessity of realistic geometric representation in high resolution applications. Spectral domain implementations in both Cartesian and spherical coordinates substantially reduce computational time when compared with direct spatial integration techniques\, while preserving numerical accuracy that is effectively indistinguishable from spatial domain algorithms at regional scales. These results highlight the trade-offs between geometric realism\, accuracy\, and computational efficiency\, and provide practical guidance for selecting suitable forward modeling strategies in numerical studies. Finally\, we present several examples of hydrological mass changes derived from gravity forward modeling.
URL:https://geodesy.science/event/hydrologic-signature-in-geodetic-observations/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Commission 3- Earth Rotation and Geodynamics. WG 3.1 Hydrologic signature in geodetic observations%2C WG3.1":MAILTO:berg@units.it
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260316
DTEND;VALUE=DATE:20260321
DTSTAMP:20260424T083009
CREATED:20251106T061830Z
LAST-MODIFIED:20251120T101331Z
UID:31681-1773619200-1774051199@geodesy.science
SUMMARY:EPOS days 2026
DESCRIPTION:EPOS Days is the flagship annual conference of the European Plate Observing System (EPOS)\, bringing together researchers\, data providers\, and infrastructure developers from across Europe to advance collaboration in solid Earth science. The event serves as a key forum to discuss the evolution of EPOS as a pan-European research infrastructure and to showcase progress in data interoperability\, FAIR principles\, and service integration across the various Thematic Core Services (TCS). \nThe programme combines plenary talks\, thematic sessions\, and interactive discussions covering: \n\nintroductions to EPOS and its services for newcomers and partners;\nupdates from the different TCS communities\, including geodesy\, seismology\, volcanology\, and geomagnetism;\nsessions on technical challenges\, data policy\, and ICS–TCS integration;\ndiscussions on responsible and societal use of research infrastructures;\ninternational collaboration and national implementation showcases;\nnetworking opportunities such as poster sessions and a dedicated Early Career Researchers event.\n\nOverall\, EPOS Days provides a dynamic platform to exchange knowledge\, align technical developments\, and strengthen the community working towards a FAIR\, open\, and sustainable EPOS infrastructure for solid Earth science in Europe.
URL:https://geodesy.science/event/epos-days-2026/
LOCATION:Palazzo Doglio hotel conference centre\, Cagliary\, Italy
CATEGORIES:Commission 3,IAGA,IASPEI,IAVCEI,IGETS,IGS,🌐 Other,📚 Education & Training
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/EPOSdays_26_A3_DEF_blu_Copyright-EPOSERIC_2025-11-05_721b62.jpg
ORGANIZER;CN="EPOS ERIC":MAILTO:communication@epos-eric.eu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20260311T160000
DTEND;TZID=Europe/Rome:20260311T170000
DTSTAMP:20260424T083009
CREATED:20260309T125919Z
LAST-MODIFIED:20260309T125919Z
UID:34064-1773244800-1773248400@geodesy.science
SUMMARY:Tracking Mountain Aquifer using Space Geodesy
DESCRIPTION:Dear Colleagues\,\n\nWe are pleased to announce our first seminar for our series\, hosted by the International Association of Geodesy (IAG) Working Group 3.1: Hydrologic Signature in Geodetic Observations\, will be given by Matthew Swarr\, from the University of Montana.  This seminar wil be held at 11:00 EDT/ 8:00 PDT/ 16:00 CET/ 23:00 CST.\n\nJoin the webinar:  \nhttps://iu.zoom.us/j/82295302430\nMeeting ID: 822 9530 2430\n\nTitle: Tracking Mountain Aquifer Storage and Discharge Using Space Geodesy\nAbstract: Fractured bedrock underlying mountain ranges is a critical source of water for mountain and adjacent low-elevation communities and ecosystems. Despite the importance of mountain groundwater systems to water supplies of major socioeconomic regions\, quantifying storage changes within these aquifers remains a challenge. To evaluate the fate of water stored in mountain systems and the role of extreme precipitation events\, such as atmospheric rivers\, in replenishing groundwater storage\, we use high-precision Global Navigation Satellite Systems (GNSS) surface displacements to constrain changes in groundwater storage within the Sierra Nevada and Cascade mountain ranges\, two important mountainous regions of the Western United States. We find that mountain aquifers have been significantly depleted over the past two decades\, associated with recurrent severe multi-year droughts within these regions. However\, extremely wet winters\, can replenish storage by more than twice the average annual flux over relatively short periods\, driving the state of groundwater storage from historical lows to above normal conditions. Further\, we find GNSS derived groundwater storage changes are strongly correlated with observed groundwater head from wells. These findings show that periods of extreme precipitation rapidly recharge mountain aquifer systems and can offset multi-year losses. Moreover\, mountain aquifer systems can retain storage gains for several years post-event\, providing a durable source of streamflow\, agricultural\, and municipal water supply. As extreme precipitation events are predicted to become more intense and frequent in coming years\, we hypothesize that these events may help offset groundwater loss due to aridification\, sustaining ecosystems and buffering against a new\, drier climate normal. Additionally\, we provide insights on a newly developed method to constrain the hydraulic properties of mountain groundwater systems at the mountain range-scale using fluid diffusion models in combination with our GNSS-inferred estimates of groundwater storage. Our results indicate the effective hydraulic conductivity of the bedrock within the Sierra Nevada and Cascades is an order of magnitude higher than previous findings\, and we find consistency between our estimates of the average groundwater flow path length within the Sierra Nevada and Cascades and those derived from perennial and intermittent and perennial stream networks\, respectively\, indicating the Cascades to be a recharge dominated groundwater system with increased regional groundwater flow compared to the Sierra Nevada. These results further the current understanding of the storage and release properties of mountain groundwater systems as well as highlighting the use of geodetic observations in advancing groundwater hydrology.\n\n\nCarla Braitenberg and Grace Carlson\n\nGrace Carlson\nshe/ her\nDepartment of Geography\nIndiana University\n\n\nCarla Braitenberg\nDepartment of Mathematics\, Informatics and Geosciences\nUniversity of Trieste
URL:https://geodesy.science/event/tracking-mountain-aquifer-using-space-geodesy/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Commission 3- Earth Rotation and Geodynamics. WG 3.1 Hydrologic signature in geodetic observations":MAILTO:berg@units.it
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260305T070000
DTEND;TZID=Australia/Sydney:20260305T080000
DTSTAMP:20260424T083009
CREATED:20260218T140956Z
LAST-MODIFIED:20260218T140956Z
UID:33158-1772694000-1772697600@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Paul Tregoning (Australian National University\, Canberra\, Australia)\, will present \n“A tool to assess the accuracy of glacial isostatic adjustment predictions of present-day crustal uplift rates” \nWhile there are many global and regional glacial isostatic adjustment (GIA) models available that can be used to compute expected present-day uplift rates of the surface of the Earth\, they do not always agree in their predictions. Obtaining accurate estimates of uncertainties in predictions is difficult due to the assumptions that must be made when constructing the GIA models\, and geodetic users often simply adopt a preferred model or assign uncertanties based on the spread of values derived from several models. Here we show that\, through a combination of gravity changes observed by GRACE/GRACE-FO and uplift observed by GNSS\, it is possible to quantify the error in uplift rates of one or more GIA models. Whilst it is not possible to repair the GIA models directly\, this tool can be used to identify regions where ice histories and/or Earth rheology parameters are deficient in the GIA models. In this talk I will give examples of locations where GIA modelling appears to be very accurate as well as indicate some locations that are clearly problematic.
URL:https://geodesy.science/event/talks-on-gia-seminar-4/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Lisbon:20260223T090000
DTEND;TZID=Europe/Lisbon:20260223T100000
DTSTAMP:20260424T083009
CREATED:20260122T085759Z
LAST-MODIFIED:20260122T085759Z
UID:32771-1771837200-1771840800@geodesy.science
SUMMARY:GNSS-EPOS Webinar\, with Dr. Marianne Métois
DESCRIPTION:We are pleased to invite the GNSS-EPOS community to the inaugural session of our 2026 webinar series\, featuring guest speaker Dr. Marianne Métois from the Laboratoire de Géologie de Lyon. \nPresentation Title:\n\n“Tracking very slow deformation of continental Europe with GNSS: challenges and perspectives” \n\nEvent Details:\n\n\nDate: Monday\, 23rd February 2026 \n\n\nTime: 10:00 – 11:00 CET \n\n\nPlatform: Microsoft Teams \n\nRegistration: CLICK FOR REGISTRATION
URL:https://geodesy.science/event/gnss-epos-webinar-with-dr-marianne-metois/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/GNSS-EPOS_2026_Webinar_Copyright-EPOSTCSGNSS_2026-01-21_e34d8d.png
ORGANIZER;CN="EPOS TCS GNSS":MAILTO:communication@gnss-epos.eu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Stockholm:20260203T170000
DTEND;TZID=Europe/Stockholm:20260203T180000
DTSTAMP:20260424T083009
CREATED:20251210T083323Z
LAST-MODIFIED:20251210T083323Z
UID:32255-1770138000-1770141600@geodesy.science
SUMMARY:“Talks on GIA” seminar 3
DESCRIPTION:Mirjam Bilker-Koivula (Finnish Geospatial Research Institute) and Holger Steffen (Lantmäteriet\, Sweden)\, will present \n“The Whys and Hows of Dealing with Glacial Isostatic Adjustment in a Mapping Authority” \nGlacial isostatic adjustment (GIA) affects among others vertical datums\, sea-level measurements\, GNSS heights\, and crustal motion models. Hence\, it creates technical and practical challenges for mapping agencies. They have to address them in their daily work by updating geodetic reference frames\, modeling vertical land motion\, adjusting elevation datasets\, communicating changes to users\, maintaining long-term stability of coordinates and more. We will present some examples how two authorities\, Lantmäteriet in Sweden and the Finnish Geospatial Research Institute (FGI)\, handle GIA. We will focus on deformation and gravity change\, but also provide snapshots of Lantmäteriet’s communication efforts and FGI’s GIA-related investigations in Antarctica.
URL:https://geodesy.science/event/talks-on-gia-seminar-3/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="IAG/IACS subcommission 3.4 %E2%80%9CCryospheric Deformation%E2%80%9D":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251205T150000
DTEND;TZID=UTC:20251205T160000
DTSTAMP:20260424T083009
CREATED:20251114T090917Z
LAST-MODIFIED:20251114T090917Z
UID:31775-1764946800-1764950400@geodesy.science
SUMMARY:“Talks on GIA” seminar
DESCRIPTION:Helio Guerra Neto and Jeff Freymueller from Michigan State University\, East Lansing\, USA\, will present \n“GIA in the Great Lakes Basin: A Geodetic Perspective on Vertical Motion and Hydrological Loading” \nVertical crustal motion in the Great Lakes Basin\, North America\, results from a combination of ongoing Glacial Isostatic Adjustment (GIA) and environmental and hydrological loadings. The hinge line for present-day vertical motion from GIA passes through the region\, and the last 15 years have featured significant rise and then fall of the water levels in the Great Lakes. The region is also densely instrumented with continuous GNSS sites\, due to extensive networks operated by US states. We are involved in a project with the goal of constraining groundwater changes in the region\, and to make those measurements we need to remove the GIA signal accurately. In this presentation\, we will discuss recent advances in our project\, using GNSS time series to quantify vertical land motion across the basin\, emphasizing the challenges of distinguishing long-term uplift signals (GIA) from the elastic responses to local mass variations.\nWe identify three distinct periods with very different patterns of local mass variations. Before 2012\, the water levels in the Great Lakes were stable\, and GRACE data suggest minimal total water changes across the region; this time interval should thus feature motions entirely due to GIA. From 2012-2019\, water levels in the Lakes rose to record highs\, and since 2020 the water levels have been falling at a similar rate. We thus examine the velocities in map view and along profiles roughly normal to the ice front.\nWe have compared the predictions of a large number of GIA models (mainly variations in the Earth models) with the pre-2012 observations\, which should be due entirely to GIA. We find that none of the GIA models adequately predict the observed data\, and models fail systematically: they all predict the hinge line to be located too far south. When viewed along a profile normal to the ice front\, our data look very much like a GIA model curve. We thus experimented with an empirical correction in which we shift the GIA model predictions laterally and identify a suite of models that predict profiles with the same shape as the data. The model predictions need to be shifted northward to northeastward\, which would likely mean that an ice model with less ice near the southern ice front in the Great Lakes region would fit the data better.
URL:https://geodesy.science/event/talks-on-gia-seminar-2/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="IAG/IACS subcommission 3.4 %E2%80%9CCryospheric Deformation%E2%80%9D":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251106T170000
DTEND;TZID=Europe/Berlin:20251106T180000
DTSTAMP:20260424T083009
CREATED:20251013T094703Z
LAST-MODIFIED:20251022T060719Z
UID:30586-1762448400-1762452000@geodesy.science
SUMMARY:"Talks on GIA" seminar
DESCRIPTION:“Talks on GIA” seminar – Constraining GIA where the mantle is heterogeneous AND Community Priorities for GNSS Measurements\nWe will have two presentations. \n\nErica Lucas (University of California\, Santa Cruz\, USA) will present “Constraining Glacial Isostatic Adjustment where the mantle is heterogeneous”.\nTerry Wilson (Ohio State University\, Columbus\, USA) will present “Community Priorities for GNSS Measurements to Constrain GIA – Results of a Survey”\n\n“Constraining Glacial Isostatic Adjustment where the mantle is heterogeneous”\nTo date\, investigations of the impact of 3-D Earth structure on GIA have adopted solid Earth viscoelastic models based on global- and continental-scale seismic imaging\, with variability at spatial length scales >150 km. However\, regional body-wave tomography shows mantle structure variability at smaller length scales (∼50–100 km) in central West Antarctica. We investigate the effects of incorporating smaller-scale lateral variability in upper-mantle viscosity into 3-D GIA simulations\, finding that upper-mantle structure at the glacial drainage basin scale is found to impact GIA model predictions for modern and projected ice mass changes. Differences between simulations adopting upper-mantle viscosity structure inferred from regional- versus coarser continental-scale seismic imaging are large enough to impact the interpretation of crustal motion observations from GNSS and reach up to ∼15 % of the total predicted sea level change during the instrumental record. \n“Community Priorities for GNSS Measurements to Constrain GIA – Results of a Survey”\nA survey in 2025 revealed community views on the most pressing science questions in Antarctica that can be addressed using GNSS measurements and on the regions in Antarctica where in situ GNSS observations will be most helpful in answering these science questions. A summary of survey results will be presented for discussion.
URL:https://geodesy.science/event/talks-on-gia-seminar/
CATEGORIES:Commission 3,📚 Education & Training
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250602
DTEND;VALUE=DATE:20250607
DTSTAMP:20260424T083009
CREATED:20250305T062105Z
LAST-MODIFIED:20250325T113645Z
UID:25594-1748822400-1749254399@geodesy.science
SUMMARY:2025 Glacial Isostatic Adjustment workshop: Advancing Models and Observational Constraints
DESCRIPTION:We are excited to announce that registration for the “2025 Glacial Isostatic Adjustment workshop: Advancing Models and Observational Constraints” taking place on June 2nd to 6th\, 2025\, in Sidney (British Columbia\, Canada) & online\, is now open. \nTo register\, please visit our website at https://polenet.org/2025-gia-workshop-registration/. \nPlease note that space is limited by the physical capacity of the workshop venue. Depending on the level of interest\, it may be necessary to cap in-person registration. If needed\, priority will be given to individuals with accepted abstracts and invited speakers\, with the remaining in-person registration seats offered on a first come\, first served basis. A notification will be posted on the workshop website (https://polenet.org/2025-gia-workshop/) if all in-person spaces have been filled. Registration deadline is April 11th\, 2025\, for in-person attendees. Virtual attendance is free of charge and there is no limit on the number of attendees. \nThe schedule and detailed programme will be published on the workshop website soon. \nIf you have any questions\, please feel free to reach out to Karen Simon (karen.simon@nrcan-rncan.gc.ca).
URL:https://geodesy.science/event/2025-glacial-isostatic-adjustment-workshop-advancing-models-and-observational-constraints/
LOCATION:Sidney\, CA\, Sidney\, Canada
CATEGORIES:Commission 3,IACS,IASPEI
END:VEVENT
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