气候变化领域集成服务门户(CCPortal): New Fault Slip Distribution for the 2010 Mw 7.2 El Mayor Cucapah Earthquake Based on Realistic 3D Finite Element Inversions of Coseismic Displacements Using Space Geodetic Data

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DOI	10.1029/2020JB020016
	New Fault Slip Distribution for the 2010 Mw 7.2 El Mayor Cucapah Earthquake Based on Realistic 3D Finite Element Inversions of Coseismic Displacements Using Space Geodetic Data
	Pulvirenti F.; Liu Z.; Lundgren P.; Gonzalez-Ortega A.; Aloisi M.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	In this work, we investigate the April 4, 2010, Mw 7.2 El Mayor Cucapah (EMC) earthquake. Existing studies modeled the EMC area as an elastic half-space in a homogeneous or vertically layered structure, which, along with differences in data and inversion methodologies, led to considerable variability in the resultant fault slip models. To investigate the EMC earthquake more realistically, we first examine how published coseismic fault slip models have approached the problem and what are their findings, then we select the optimal geometry and slip of one most recent and comprehensive coseismic fault slip model, obtained through analytical inversions, and adapt them in a three-dimensional finite element numerical environment where we assess the effects of topography and material heterogeneities. Numerically optimized slip models are obtained via joint inversion of GPS, interferometric synthetic aperture radar, and subpixel offset data sets. We find the effect of topography to be negligible while the inclusion of material heterogeneities enhances the slip at depth, as might be expected where the medium has higher rigidity, and better fits the displacements at both near and far field, especially around the Salton Sea area. The match with geodetic data is significantly improved when the fault slip is increased at the fault planes close to the epicenter and deeper at the southernmost plane, with respect to the slip of the chosen analytical model. Our findings suggest that this earthquake was associated with a higher and more spatially concentrated slip than previously thought implying a greater stress drop at depth. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	El Mayor Cucapah; finite elements; joint inversion; modeling; slip distribution; tectonics
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/187419
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Departamento de Sismologia, Ciencias de la Tierra, CICESE, Ensenada, Mexico; Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, Catania, Italy
推荐引用方式 GB/T 7714	Pulvirenti F.,Liu Z.,Lundgren P.,et al. New Fault Slip Distribution for the 2010 Mw 7.2 El Mayor Cucapah Earthquake Based on Realistic 3D Finite Element Inversions of Coseismic Displacements Using Space Geodetic Data[J],2021,126(1).
APA	Pulvirenti F.,Liu Z.,Lundgren P.,Gonzalez-Ortega A.,&Aloisi M..(2021).New Fault Slip Distribution for the 2010 Mw 7.2 El Mayor Cucapah Earthquake Based on Realistic 3D Finite Element Inversions of Coseismic Displacements Using Space Geodetic Data.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Pulvirenti F.,et al."New Fault Slip Distribution for the 2010 Mw 7.2 El Mayor Cucapah Earthquake Based on Realistic 3D Finite Element Inversions of Coseismic Displacements Using Space Geodetic Data".Journal of Geophysical Research: Solid Earth 126.1(2021).