Deep long period seismicity preceding and during the 2021 Fagradalsfjall eruption, Iceland

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F22%3A00572684" target="_blank" >RIV/67985530:_____/22:00572684 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s00445-022-01603-2" target="_blank" >https://link.springer.com/article/10.1007/s00445-022-01603-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00445-022-01603-2" target="_blank" >10.1007/s00445-022-01603-2</a>

Result language

angličtina

Original language name

Deep long period seismicity preceding and during the 2021 Fagradalsfjall eruption, Iceland

Original language description

We use a dense seismic network on the Reykjanes Peninsula, Iceland, to image a group of earthquakes at 10-12 km depth, 2 km north-east of 2021 Fagradalsfjall eruption site. These deep earthquakes have a lower frequency content compared to earthquakes located in the upper, brittle crust and are similar to deep long period (DLP) seismicity observed at other volcanoes in Iceland and around the world. We observed several swarms of DLP earthquakes between the start of the study period (June 2020) and the initiation of the 3-week-long dyke intrusion that preceded the eruption in March 2021. During the eruption, DLP earthquake swarms returned 1 km SW of their original location during periods when the discharge rate or fountaining style of the eruption changed. The DLP seismicity is therefore likely to be linked to the magma plumbing system beneath Fagradalsfjall. However, the DLP seismicity occurred similar to 5 km shallower than where petrological modelling places the near-Moho magma storage region in which the Fagradalsfjall lava was stored. We suggest that the DLP seismicity was triggered by the exsolution of CO2-rich fluids or the movement of magma at a barrier to the transport of melt in the lower crust. Increased flux through the magma plumbing system during the eruption likely adds to the complexity of the melt migration process, thus causing further DLP seismicity, despite a contemporaneous magma channel to the surface.

Czech name

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Czech description

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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

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

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

Name of the periodical

Bulletin of Volcanology

ISSN

0258-8900

e-ISSN

1432-0819

Volume of the periodical

84

Issue of the periodical within the volume

12

Country of publishing house

DE - GERMANY

Number of pages

20

Pages from-to

101

UT code for WoS article

000879030000002

EID of the result in the Scopus database

2-s2.0-85141173147