Title | Rupture Model for the 29 July 2021 M-W 8.2 Chignik, Alaska Earthquake Constrained by Seismic, Geodetic, and Tsunami Observations |
Author | |
Corresponding Author | Ye, Lingling; Bai, Yefei |
Publication Years | 2022-07-01
|
DOI | |
Source Title | |
ISSN | 2169-9313
|
EISSN | 2169-9356
|
Volume | 127Issue:7 |
Abstract | A great earthquake struck the Semidi segment of the plate boundary along the Alaska Peninsula on 29 July 2021, re-rupturing part of the 1938 rupture zone. The 2021 M-W 8.2 Chignik earthquake occurred just northeast of the 22 July 2020 M-W 7.8 Simeonof earthquake, with little slip overlap. Analysis of teleseismic P and SH waves, regional Global Navigation Satellite System (GNSS) displacements, and near-field and far-field tsunami observations provides a good resolution of the 2021 rupture process. During similar to 60-s long faulting, the slip was nonuniformly distributed along the megathrust over depths from 32 to 40 km, with up to similar to 12.9-m slip in an similar to 170-km-long patch. The 40-45 km down-dip limit of slip is well constrained by GNSS observations along the Alaska Peninsula. Tsunami observations preclude significant slip from extending to depths <25 km, confining all coseismic slip to beneath the shallow continental shelf. Most aftershocks locate seaward of the large-slip zones, with a concentration of activity up-dip of the deeper southwestern slip zone. Some localized aftershock patches locate beneath the continental slope. The surface-wave magnitude M-S of 8.1 for the 2021 earthquake is smaller than M-S = 8.3-8.4 for the 1938 event. Seismic and tsunami data indicate that slip in 1938 was concentrated in the eastern region of its aftershock zone, extending beyond the Semidi Islands, where the 2021 event did not rupture. |
Keywords | |
URL | [Source Record] |
Indexed By | |
Language | English
|
Important Publications | NI Journal Papers
|
SUSTech Authorship | First
; Corresponding
|
Funding Project | National Aeronautics and Space Administration under NSF Cooperative Agreement[EAR-1724794]
; National Natural Science Foundation of China[41874056]
; Finance Science and Technology Project of Hainan Province[ZDKJ202019]
; National Science Foundation[EAR1802364]
|
WOS Research Area | Geochemistry & Geophysics
|
WOS Subject | Geochemistry & Geophysics
|
WOS Accession No | WOS:000826314600001
|
Publisher | |
ESI Research Field | GEOSCIENCES
|
Data Source | Web of Science
|
Citation statistics |
Cited Times [WOS]:5
|
Document Type | Journal Article |
Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/356212 |
Department | Department of Earth and Space Sciences |
Affiliation | 1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China 2.Zhejiang Univ, Ocean Coll, Zhoushan, Peoples R China 3.Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA USA 4.Univ Hawaii Manoa, Dept Ocean & Resources Engn, Honolulu, HI USA 5.CALTECH, Seismol Lab, Pasadena, CA 91125 USA |
First Author Affilication | Department of Earth and Space Sciences |
Corresponding Author Affilication | Department of Earth and Space Sciences |
First Author's First Affilication | Department of Earth and Space Sciences |
Recommended Citation GB/T 7714 |
Ye, Lingling,Bai, Yefei,Si, Daojun,et al. Rupture Model for the 29 July 2021 M-W 8.2 Chignik, Alaska Earthquake Constrained by Seismic, Geodetic, and Tsunami Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(7).
|
APA |
Ye, Lingling,Bai, Yefei,Si, Daojun,Lay, Thorne,Cheung, Kwok Fai,&Kanamori, Hiroo.(2022).Rupture Model for the 29 July 2021 M-W 8.2 Chignik, Alaska Earthquake Constrained by Seismic, Geodetic, and Tsunami Observations.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(7).
|
MLA |
Ye, Lingling,et al."Rupture Model for the 29 July 2021 M-W 8.2 Chignik, Alaska Earthquake Constrained by Seismic, Geodetic, and Tsunami Observations".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.7(2022).
|
Files in This Item: | ||||||
File Name/Size | DocType | Version | Access | License | ||
Rupture Model for th(6062KB) | Restricted Access | -- |
|
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment