气候变化领域集成服务门户(CCPortal): Volcano-Tectonic Interactions at Sabancaya Volcano, Peru: Eruptions, Magmatic Inflation, Moderate Earthquakes, and Fault Creep

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DOI	10.1029/2019JB019281
	Volcano-Tectonic Interactions at Sabancaya Volcano, Peru: Eruptions, Magmatic Inflation, Moderate Earthquakes, and Fault Creep
	MacQueen P.; Delgado F.; Reath K.; Pritchard M.E.; Bagnardi M.; Milillo P.; Lundgren P.; Macedo O.; Aguilar V.; Ortega M.; Anccasi R.; Lazarte Zerpa I.A.; Miranda R.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	We present evidence of volcano-tectonic interactions at Sabancaya volcano that we relate to episodic magma injection and high regional fluid pore pressures. We present a surface deformation time series at Sabancaya including observations from ERS-1/2, Envisat, Sentinel-1, COSMO-SkyMed, and TerraSAR-X that spans June 1992 to February 2019. These data show deep-seated inflation northwest of Sabancaya from 1992–1997 and 2013–2019, as well as creep and rupture on multiple faults. Afterslip on the Mojopampa fault following a 2013 MW 5.9 earthquake is anomalously long lived, continuing for at least 6 years. The best fit fault plane for the afterslip is right-lateral motion on an EW striking fault at 1 km depth. We also model surface deformation from two 2017 earthquakes (MW 4.4 and MW 5.2) on unnamed faults, for which the best fit models are NW striking normal faults at 1–2 km depth. Our best fit model for a magmatic inflation source (13 km depth, volume change of 0.04 to 0.05 km3 yr−1) induces positive Coulomb static stress changes on these modeled fault planes. Comparing these deformation results with evidence from satellite thermal and degassing data, field observations, and seismic records, we interpret strong pre-eruptive seismicity at Sabancaya as a consequence of magmatic intrusions destabilizing tectonic faults critically stressed by regionally high fluid pressures. High fluid pressure likely also promotes fault creep driven by static stress transfer from the inflation source. We speculate that combining high pore fluid pressures with sufficiently large, offset magmatic inflation can promote strong earthquakes during volcanic unrest. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	earthquake; fault creep; geodesy; InSAR; remote sensing; volcano
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187879
作者单位	Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Now at NASA Goddard Space Flight Center, Greenbelt, MD, United States; Departamento Académico de Geología y Geofísica, Universidad Nacional de San Agustín de Arequipa, Arequipa, Peru; Observatorio Vulcanológico del INGEMMET (OVI), Arequipa, Peru; Instituto Geofísico del Perú, Lima, Peru
推荐引用方式 GB/T 7714	MacQueen P.,Delgado F.,Reath K.,et al. Volcano-Tectonic Interactions at Sabancaya Volcano, Peru: Eruptions, Magmatic Inflation, Moderate Earthquakes, and Fault Creep[J],2020,125(5).
APA	MacQueen P..,Delgado F..,Reath K..,Pritchard M.E..,Bagnardi M..,...&Miranda R..(2020).Volcano-Tectonic Interactions at Sabancaya Volcano, Peru: Eruptions, Magmatic Inflation, Moderate Earthquakes, and Fault Creep.Journal of Geophysical Research: Solid Earth,125(5).
MLA	MacQueen P.,et al."Volcano-Tectonic Interactions at Sabancaya Volcano, Peru: Eruptions, Magmatic Inflation, Moderate Earthquakes, and Fault Creep".Journal of Geophysical Research: Solid Earth 125.5(2020).