4-4-4-4-4-4-4-4-4-4-4-4-4 From: Rosemary Philippa Cole - RH <rosiecole@xxxxx> The next seminar from the IAVCEI/IACS joint commission on Volcano-Ice Interactions with Magnús T. Gudmundsson (Nordvulk, Institute of Earth Sciences, University of Iceland) Title: *Volcano-ice interaction in Iceland, how to monitor and what we have learned in the last 30 years of frequent eruptions* Wednesday 7th December, 2022 | 7 am PST | 10 am EST | 3 pm UTC | 4 pm CET On Zoom (details for registering below) Abstract: Volcanic eruptions in ice-covered volcanoes and geothermal activity under glaciers leads to melting of ice, formation of ice cauldrons, and cause jokulhlaups. The jokulhlaups can be a major hazard in the affected areas and can cause great damage to infrastructure. Sizable parts of the volcanic zones in Iceland are covered by glaciers and some of the most active volcanoes are partly or fully subglacial. After almost 60 years of relative quiescence, ice covered volcanoes have been highly active in Iceland since 1996. Six confirmed eruptions and several other periods of unrest have occurred in the last 26 years. This includes the Gjálp eruption in 1996 where a 6 km long and up to 500 m high hyaloclastite ridge formed over 13 days, and activity in Bárðarbunga in 2014-15 with minor eruptive events under ice in connection with a major rifting event and the subsidence of the ice-filled caldera. In the eruptions since 1996, the volume of subglacially-erupted material varied between 0.001 km3 and 0.45 km 3 (DRE), volume of melted ice from 0.01 to 4 km3, ice thickness between 50 and 750 m, and magma compositions ranged from basalt to trachyte. Observations of the course of events during these eruptions were obtained through using aerial surveying and other available methods. The styles of activity observed demonstrate the dominant role of magma fragmentation in most cases and very rapid melting in the initial stages. The observations also show that glacier thickness and glacier geometry play a key role in determining eruption behavior and glacier response and that bedrock and ice geometry play a major role in controlling the drainage of meltwater from the eruption site. In the talk, examples from all these eruptions will be shown, the principal lessons outlined, and the methods used for monitoring will be described, including airborne and ground-based surveying and the increasing use of various satellite data. Registration via the link below is required in order to receive the zoom meeting invitation and/or access the recording, which will become available after the meeting. https://urldefense.com/v3/__https://uoregon.zoom.us/meeting/register/tJElc--grz4rGdHkFnDP4tJqj41hB0Hi1s7z__;!!IKRxdwAv5BmarQ!ZU7zd8lhfNwIvTaL7snntlKQoQE5IrYXdoCRQdVuG3i6As2F-j8ra4zO6bvcUU3p26juUOa3YYOszQzf$ <https://urldefense.com/v3/__https://uoregon.zoom.us/meeting/register/tJElc--grz4rGdHkFnDP4tJqj41hB0Hi1s7z__;!!IKRxdwAv5BmarQ!dsdTsaZzOPRAvxqpRRgkrqnls_vlSYztVi_Ey8-uKZ0oS8y1kxfvHU4PLSK0K8cNhFxKJhumJ3SwKuna$> After registering, you will receive a confirmation email containing information about joining the meeting. 4-4-4-4-4-4-4-4-4-4-4-4-4 ------------------------------
