Deformation and seismicity decline before the 2021 Fagradalsfjall eruption.

ABSTRACT: Increased rates of deformation and seismicity are well-established precursors to volcanic eruptions, and their interpretation forms the basis for eruption warnings worldwide. Rates of ground displacement and the number of earthquakes escalate before many eruptions^1-3, as magma forces its way towards the surface. However, the pre-eruptive patterns of deformation and seismicity vary widely. Here we show how an eruption beginning on 19 March 2021 at Fagradalsfjall, Iceland, was preceded by a period of tectonic stress release ending with a decline in deformation and seismicity over several days preceding the eruption onset. High rates of deformation and seismicity occurred from 24 February to mid-March in relation to gradual emplacement of an approximately 9-km-long magma-filled dyk

SUBMITTER: Sigmundsson F 

PROVIDER: S-EPMC9477732 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature