4-4-4-4-4-4-4-4-4-4-4-4-4 From: Edna Warsame Dualeh <edna.dualeh@xxxxxxxxxxxxx> Dear Colleagues, COMET (The Centre for Observation and Modelling of Earthquakes, Volcanoes, and Tectonics) invites you to the next instalment of our COMET+ webinar series, viewable from the home office. *High-resolution remote sensing data to measure topographic changes in volcanoes* *Wednesday 28th May 2025 at 4pm UK time* (4pm BST / 5pm CEST / 8am PDT) *Dr Federico Galetto* *Cornell University, USA* *Please register at: * https://ukri.zoom.us/webinar/register/WN_w6vsUH7rRjqNFaC-VDlG4A <https://urldefense.com/v3/__https://ukri.zoom.us/webinar/register/WN_w6vsUH7rRjqNFaC-VDlG4A__;!!IKRxdwAv5BmarQ!aUO3KkAfF4DeyVMqXookHAE2J7LhFSgOOcX89chef5dqHsvwkJQWxizsSZmsjPjhB6Yu2c5rerjiu3QELPxDj_Fz3w$> (After registering, you will receive a confirmation email containing information on how to join the webinar) *Abstract:* Quantifying topographic changes in volcanoes provides important information about volcanic deposits and mass-wasting processes, with implications for forecasting volcanic hazards. High-resolution Digital Elevation Models (DEMs) acquired over time are a powerful tool to develop time-series of topographic changes. Here we use EarthDEM/ArcticDEM DEMs, derived from Maxar satellites stereo-optical data, and DEMs derived from bistatic TerraSAR-X/TanDEM-X data to study topographic changes in different volcanoes placed worldwide. These volcanoes experienced different volcanic eruptions, generating a wide range of volcanic deposits and mass-wasting features. The high resolution of these DEMs allowed us to detect many topographic changes not visible with lower resolution DEMs, also in difficult environmental conditions, as long as height changes are â?¥0.5-2 m, which is the range of vertical data errors. Pre-eruptive DEMs used to process bistatic data can affect volume estimates, while clouds and artifacts often affect EarthDEM/ArcticDEM. Nevertheless, high-resolution DEMs remain a valuable tool to quantify volcanic deposits and can be combined with other remote sensing data (thermal, InSAR) to better understand the volcanic activity in poorly monitored volcanoes. Acquisition of high resolution DEMs on a more frequent basis could significantly improve our ability to document time-dependent topographic changes at volcanoes worldwide. The COMET+ webinar series promotes research by collaborators of COMET scientists. We aim to provide a platform for these researchers to showcase their work to large and international audiences, opening doors to broader collaborative networks and enhancing the communityâ??s diversity of backgrounds and ideas. Catch up on past COMET and COMET+ webinars on our YouTube page: https:/www.youtube.com/channel/UCtFDytX1hgjvlS4NH48M2oQ/video <https://urldefense.com/v3/__https://www.youtube.com/channel/UCtFDytX1hgjvlS4NH48M2oQ/videos__;!!IKRxdwAv5BmarQ!aUO3KkAfF4DeyVMqXookHAE2J7LhFSgOOcX89chef5dqHsvwkJQWxizsSZmsjPjhB6Yu2c5rerjiu3QELPxnR2lsWA$> Best wishes, Edna Dualeh, Sophie Butcher and Milan Lazecky COMET - Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics https://comet.nerc.ac.uk/ <https://urldefense.com/v3/__https://comet.nerc.ac.uk/__;!!IKRxdwAv5BmarQ!aUO3KkAfF4DeyVMqXookHAE2J7LhFSgOOcX89chef5dqHsvwkJQWxizsSZmsjPjhB6Yu2c5rerjiu3QELPyT70eiCg$> @NERC_COMET <https://urldefense.com/v3/__https://twitter.com/nerc_comet?lang=en__;!!IKRxdwAv5BmarQ!aUO3KkAfF4DeyVMqXookHAE2J7LhFSgOOcX89chef5dqHsvwkJQWxizsSZmsjPjhB6Yu2c5rerjiu3QELPzI4mhOMw$> 4-4-4-4-4-4-4-4-4-4-4-4-4 ============================================================== Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI). ASU - http://www.asu.edu/ PSU - http://pdx.edu/ GVP - https://volcano.si.edu/ IAVCEI - https://www.iavceivolcano.org/ To subscribe to the volcano list, send the message: subscribe volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxx To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxx. To contribute to the volcano list, send your message to: volcano@xxxxxxx. Please do not send attachments. ============================================================== ------------------------------ End of Volcano Digest - 14 May 2025 to 16 May 2025 (#2025-44) *************************************************************
