Deformation and seismicity decline before the 2021 Fagradalsfjall eruption

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F22%3A00561641" target="_blank" >RIV/67985530:_____/22:00561641 - isvavai.cz</a>

Result on the web

<a href="https://www.nature.com/articles/s41586-022-05083-4" target="_blank" >https://www.nature.com/articles/s41586-022-05083-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41586-022-05083-4" target="_blank" >10.1038/s41586-022-05083-4</a>

Result language

angličtina

Original language name

Deformation and seismicity decline before the 2021 Fagradalsfjall eruption

Original language description

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 dyke, between the surface and 8 km depth (volume approximately 34 x 10(6) m(3)), as well as the triggering of strike-slip earthquakes up to magnitude M-W 5.64. As stored tectonic stress was systematically released, there was less lateral migration of magma and a reduction in both the deformation rates and seismicity. Weaker crust near the surface may also have contributed to reduced seismicity, as the depth of active magma emplacement progressively shallowed. This demonstrates that the interaction between volcanoes and tectonic stress as well as crustal layering need to be fully considered when forecasting eruptions.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10507 - Volcanology

Project

<a href="/en/project/TO01000198" target="_blank" >TO01000198: NAtural Seismicity as a Prospecting and MONitoring tool for geothermal energy extraction</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nature

ISSN

0028-0836

e-ISSN

1476-4687

Volume of the periodical

609

Issue of the periodical within the volume

7927

Country of publishing house

GB - UNITED KINGDOM

Number of pages

6

Pages from-to

523-528

UT code for WoS article

000854788200004

EID of the result in the Scopus database

2-s2.0-85137914786