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INTERACTION SEISMES / VOLCANS

INTERACTION SEISMES / VOLCANS. Icelandic subglacial volcanoes. Example of the KATLA volcano. caldera situated under Myrdalsjökull icecap ; last eruption : 1918 Seasonal snow thickness variation induce surface pressure change around 0.04 – 0.02 MPa

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INTERACTION SEISMES / VOLCANS

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  1. INTERACTION SEISMES / VOLCANS

  2. Icelandic subglacial volcanoes

  3. Example of the KATLA volcano • caldera situated under Myrdalsjökull icecap ; last eruption : 1918 • Seasonal snow thickness variation induce surface pressure change around 0.04 – 0.02 MPa • Seasonal seismic activity with more earthquakes during the 2nd half of the year (Einarsson & Brandsdottir, 2000) • No historical eruption during winter periods (Eliasson & al., 2005) From Sturkel & al. (2006)

  4. Is there a correlation between the seasonal unloading event and seismic/volcanic activity? • At Katla, many authors explain the seasonal seismic activity by : • - the seasonal load change at the ice cap surface • the resulting change in crustal pore pressure • We decided to model the «Coulomb stress change (DCFF)» due to • this surface unload. • The goal is to show if the seasonal surface event at Katla might trigger • earthquakes.

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