气候变化领域集成服务门户(CCPortal): Cyclical geothermal unrest as a precursor to Iceland's 2021 Fagradalsfjall eruption

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DOI	10.1038/s41561-022-00930-5
	Cyclical geothermal unrest as a precursor to Iceland's 2021 Fagradalsfjall eruption
	Flovenz, Olafur G.; Wang, Rongjiang; Hersir, Gylfi Pall; Dahm, Torsten; Hainzl, Sebastian; Vassileva, Magdalena; Drouin, Vincent; Heimann, Sebastian; Isken, Marius Paul; Gudnason, Egill A.; Agustsson, Kristjan; Agustsdottir, Thorbjorg; Horalek, Josef; Motagh, Mahdi; Walter, Thomas R.; Rivalta, Eleonora; Jousset, Philippe; Krawczyk, Charlotte M.; Milkereit, Claus
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	397
结束页码	+
卷号	15 期号:5 页码:21
英文摘要	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.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000789729500001
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272484
作者单位	Helmholtz Association; Helmholtz-Center Potsdam GFZ German Research Center for Geosciences; China University of Geosciences; University of Potsdam; Leibniz University Hannover; Czech Academy of Sciences; Institute of Geophysics of the Czech Academy of Sciences; University of Bologna; Technical University of Berlin
推荐引用方式 GB/T 7714	Flovenz, Olafur G.,Wang, Rongjiang,Hersir, Gylfi Pall,et al. Cyclical geothermal unrest as a precursor to Iceland's 2021 Fagradalsfjall eruption[J],2022,15(5):21.
APA	Flovenz, Olafur G..,Wang, Rongjiang.,Hersir, Gylfi Pall.,Dahm, Torsten.,Hainzl, Sebastian.,...&Milkereit, Claus.(2022).Cyclical geothermal unrest as a precursor to Iceland's 2021 Fagradalsfjall eruption.NATURE GEOSCIENCE,15(5),21.
MLA	Flovenz, Olafur G.,et al."Cyclical geothermal unrest as a precursor to Iceland's 2021 Fagradalsfjall eruption".NATURE GEOSCIENCE 15.5(2022):21.