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Investigating Seasonal Seismic Activity at Katla Volcano: Impacts of Subglacial Dynamics

This study examines Katla, a subglacial volcano beneath Myrdalsjökull icecap, focusing on its seasonal seismic patterns. While the last eruption occurred in 1918, research indicates a notable increase in earthquake frequency during the latter half of the year, possibly linked to seasonal snow thickness variations. We analyze the correlation between surface unloading events and seismic activity using Coulomb stress change modeling. Understanding these relationships is vital for assessing potential triggers of volcanic eruptions and enhancing hazard readiness in the region.

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Investigating Seasonal Seismic Activity at Katla Volcano: Impacts of Subglacial Dynamics

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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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