Cyclical geothermal unrest as a precursor to Iceland’s 2021 Fagradalsfjall eruption

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Cyclical geothermal unrest as a precursor to Iceland’s 2021 Fagradalsfjall eruption

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Cyclical geothermal unrest as a precursor to Iceland’s 2021 Fagradalsfjall eruption

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Nature Geoscience

ISSN

1752-0894

e-ISSN

1752-0908

Svazek periodika

15

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

397-404

Kód UT WoS článku

000789729500001

EID výsledku v databázi Scopus

2-s2.0-85129252410