Cyclical geothermal unrest as a precursor to Iceland’s 2021 Fagradalsfjall eruption
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F22%3A00557212" target="_blank" >RIV/67985530:_____/22:00557212 - isvavai.cz</a>
Result on the web
<a href="https://www.nature.com/articles/s41561-022-00930-5" target="_blank" >https://www.nature.com/articles/s41561-022-00930-5</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41561-022-00930-5" target="_blank" >10.1038/s41561-022-00930-5</a>
Alternative languages
Result language
angličtina
Original language name
Cyclical geothermal unrest as a precursor to Iceland’s 2021 Fagradalsfjall eruption
Original language description
Understanding and constraining the source of geodetic deformation in volcanic areas is an important component of hazard assessment. Here, we analyse deformation and seismicity for one year before the March 2021 Fagradalsfjall eruption in Iceland. We generate a high-resolution catalogue of 39,500 earthquakes using optical cable recordings and develop a poroelastic model to describe three pre-eruptional uplift and subsidence cycles at the Svartsengi geothermal field, 8 km west of the eruption site. We find the observed deformation is best explained by cyclic intrusions into a permeable aquifer by a fluid injected at 4 km depth below the geothermal field, with a total volume of 0.11 +/- 0.05 km(3) and a density of 850 +/- 350 kg m(-3). We therefore suggest that ingression of magmatic CO2 can explain the geodetic, gravity and seismic data, although some contribution of magma cannot be excluded. Ingression of magmatic gas into a geothermal aquifer generated cyclical deformation and primed the system for the 2021 Fagradalsfjall eruption, Iceland, according to a catalogue of 39,500 precursory earthquakes combined with a poroelastic model.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10507 - Volcanology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nature Geoscience
ISSN
1752-0894
e-ISSN
1752-0908
Volume of the periodical
15
Issue of the periodical within the volume
May
Country of publishing house
GB - UNITED KINGDOM
Number of pages
8
Pages from-to
397-404
UT code for WoS article
000789729500001
EID of the result in the Scopus database
2-s2.0-85129252410