Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation

The MW7.1 Anchorage earthquake is the most destructive earthquake since the 1964 MW9.2 great Alaska earthquake in the United States. In this study, high-rate GPS data and near-field broadband seismograms are used in separate and joint inversions by the generalized Cut-and-Paste (gCAP) method to esti...

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Autores principales:	Yanhao Zhang, Caijun Xu, Jin Fang, Zelong Guo
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2021
Materias:	MW7.1 Anchorage earthquake High-rate GPS and seismogram Velocity model Joint inversion Centroid depth Geodesy QB275-343 Geophysics. Cosmic physics QC801-809
Acceso en línea:	https://doaj.org/article/44875bea0292426fb1ed9e38e95e1c39
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id	oai:doaj.org-article:44875bea0292426fb1ed9e38e95e1c39
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spelling	oai:doaj.org-article:44875bea0292426fb1ed9e38e95e1c392021-11-18T04:46:13ZFocal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation1674-984710.1016/j.geog.2021.09.004https://doaj.org/article/44875bea0292426fb1ed9e38e95e1c392021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1674984721000690https://doaj.org/toc/1674-9847The MW7.1 Anchorage earthquake is the most destructive earthquake since the 1964 MW9.2 great Alaska earthquake in the United States. In this study, high-rate GPS data and near-field broadband seismograms are used in separate and joint inversions by the generalized Cut-and-Paste (gCAP) method to estimate the focal mechanism. In order to investigate the influence of crustal velocity structure on the focal mechanism inversion results, two velocity models (Crust1.0 and Alaska Earthquake Center (AEC)) are used for detailed comparison and analysis. The results show that: (1) The two nodal planes of the optimal double-couple solution are nearly north-south striking, with dip angles of about 30° and 60°respectively, and the centroid focal depth is 54–55 km, which is an intraplate normal fault event. (2) The inversion results for the two types of data and the two velocity models are consistent with some previous studies, which indicates that the results are stable and reliable. The more accurate velocity structure model is helpful for focal mechanism inversion of the complex earthquake. (3) The inclusion of high-rate GPS data in joint inversion provides a more effective constraint on centroid depth.Yanhao ZhangCaijun XuJin FangZelong GuoKeAi Communications Co., Ltd.articleMW7.1 Anchorage earthquakeHigh-rate GPS and seismogramVelocity modelJoint inversionCentroid depthGeodesyQB275-343Geophysics. Cosmic physicsQC801-809ENGeodesy and Geodynamics, Vol 12, Iss 6, Pp 381-391 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	MW7.1 Anchorage earthquake High-rate GPS and seismogram Velocity model Joint inversion Centroid depth Geodesy QB275-343 Geophysics. Cosmic physics QC801-809
spellingShingle	MW7.1 Anchorage earthquake High-rate GPS and seismogram Velocity model Joint inversion Centroid depth Geodesy QB275-343 Geophysics. Cosmic physics QC801-809 Yanhao Zhang Caijun Xu Jin Fang Zelong Guo Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation
description	The MW7.1 Anchorage earthquake is the most destructive earthquake since the 1964 MW9.2 great Alaska earthquake in the United States. In this study, high-rate GPS data and near-field broadband seismograms are used in separate and joint inversions by the generalized Cut-and-Paste (gCAP) method to estimate the focal mechanism. In order to investigate the influence of crustal velocity structure on the focal mechanism inversion results, two velocity models (Crust1.0 and Alaska Earthquake Center (AEC)) are used for detailed comparison and analysis. The results show that: (1) The two nodal planes of the optimal double-couple solution are nearly north-south striking, with dip angles of about 30° and 60°respectively, and the centroid focal depth is 54–55 km, which is an intraplate normal fault event. (2) The inversion results for the two types of data and the two velocity models are consistent with some previous studies, which indicates that the results are stable and reliable. The more accurate velocity structure model is helpful for focal mechanism inversion of the complex earthquake. (3) The inclusion of high-rate GPS data in joint inversion provides a more effective constraint on centroid depth.
format	article
author	Yanhao Zhang Caijun Xu Jin Fang Zelong Guo
author_facet	Yanhao Zhang Caijun Xu Jin Fang Zelong Guo
author_sort	Yanhao Zhang
title	Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation
title_short	Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation
title_full	Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation
title_fullStr	Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation
title_full_unstemmed	Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation
title_sort	focal mechanism inversion of the 2018 mw7.1 anchorage earthquake based on high-rate gps observation
publisher	KeAi Communications Co., Ltd.
publishDate	2021
url	https://doaj.org/article/44875bea0292426fb1ed9e38e95e1c39
work_keys_str_mv	AT yanhaozhang focalmechanisminversionofthe2018mw71anchorageearthquakebasedonhighrategpsobservation AT caijunxu focalmechanisminversionofthe2018mw71anchorageearthquakebasedonhighrategpsobservation AT jinfang focalmechanisminversionofthe2018mw71anchorageearthquakebasedonhighrategpsobservation AT zelongguo focalmechanisminversionofthe2018mw71anchorageearthquakebasedonhighrategpsobservation
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Focal mechanism inversion of the 2018 MW7.1 Anchorage earthquake based on high-rate GPS observation

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