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Title

Optimizing a Model of Coseismic Rupture for the 22 July 2020 M-W 7.8 Simeonof Earthquake by Exploiting Acute Sensitivity of Tsunami Excitation Across the Shelf Break

Author
Corresponding AuthorBai, Yefei
Publication Years
2022-07-01
DOI
Source Title
ISSN
2169-9313
EISSN
2169-9356
Volume127Issue:7
Abstract

The Shumagin seismic gap along the Alaska Peninsula experienced a major, M-W 7.8, interplate thrust earthquake on 22 July 2020. Several available finite-fault inversions indicate patchy slip of up to 4 m at 8-48 km depth. There are differences among the models in peak slip and absolute placement of slip on the plate boundary, resulting from differences in data distributions, model parameterizations, and inversion algorithms. Two representative slip models obtained from inversions of large seismic and geodetic data sets produce very different tsunami predictions at tide gauges and deep-water pressure sensors (DART stations), despite having only secondary differences in slip distribution. This is found to be the result of the acute sensitivity of the tsunami excitation for rupture below the continental shelf in proximity to an abrupt shelf break. Iteratively perturbing seismic and geodetic inversions by constraining fault model extent along dip and strike, we obtain an optimal rupture model compatible with teleseismic P and SH waves, regional three-component broadband and strong-motion seismic recordings, hr-GNSS time series and static offsets, as well as tsunami recordings at DART stations and regional and remote tide gauges. Slip is tightly bounded between 25 and 40 km depth, the up-dip limit of slip in the earthquake is resolved to be well-inland of the shelf break, and the rupture extent along strike is well-constrained. The coseismic slip increased Coulomb stress on the shallow plate boundary extending to the trench, but the frictional behavior of the megathrust below the continental slope remains uncertain.

Keywords
URL[Source Record]
Indexed By
Language
English
Important Publications
NI Journal Papers
SUSTech Authorship
Others
Funding Project
National Science Foundation[EAR1802364] ; National Aeronautics and Space Administration under NSF[EAR1724794] ; Seismological Facilities for the Advancement of Geoscience (SAGE) Award of the National Science Foundation[EAR1851048] ; Finance Science and Technology Project of Hainan Province[ZDKJ202019] ; National Science Foundation of China[41974056] ; National Natural Science Foundation of China[41874056]
WOS Research Area
Geochemistry & Geophysics
WOS Subject
Geochemistry & Geophysics
WOS Accession No
WOS:000823067100001
Publisher
ESI Research Field
GEOSCIENCES
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:2
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/355852
DepartmentDepartment of Earth and Space Sciences
Affiliation
1.Zhejiang Univ, Ocean Coll, Zhoushan, Peoples R China
2.Zhejiang Univ, Hainan Inst, Sanya, Peoples R China
3.China Univ Geosci, Inst Geophys & Geomat, Wuhan, Peoples R China
4.Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA
5.Univ Hawaii Manoa, Dept Ocean & Resources Engn, Honolulu, HI 96822 USA
6.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
Recommended Citation
GB/T 7714
Bai, Yefei,Liu, Chengli,Lay, Thorne,et al. Optimizing a Model of Coseismic Rupture for the 22 July 2020 M-W 7.8 Simeonof Earthquake by Exploiting Acute Sensitivity of Tsunami Excitation Across the Shelf Break[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(7).
APA
Bai, Yefei,Liu, Chengli,Lay, Thorne,Cheung, Kwok Fai,&Ye, Lingling.(2022).Optimizing a Model of Coseismic Rupture for the 22 July 2020 M-W 7.8 Simeonof Earthquake by Exploiting Acute Sensitivity of Tsunami Excitation Across the Shelf Break.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(7).
MLA
Bai, Yefei,et al."Optimizing a Model of Coseismic Rupture for the 22 July 2020 M-W 7.8 Simeonof Earthquake by Exploiting Acute Sensitivity of Tsunami Excitation Across the Shelf Break".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.7(2022).
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