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Geodetic model of the 2018 M (sub w) 7.2 Pinotepa, Mexico, earthquake inferred from InSAR and GPS data

Li Yanchuan, Shan Xinjian, Zhu Chuanhua, Qiao Xin, Zhao Lei and Qu Chunyan
Geodetic model of the 2018 M (sub w) 7.2 Pinotepa, Mexico, earthquake inferred from InSAR and GPS data
Bulletin of the Seismological Society of America (March 2020) 110 (3): 1115-1124

Abstract

Investigating the interaction between slow-slip events (SSEs) and large earthquakes provides insights into earthquake-triggering mechanisms and is crucial for earthquake hazard assessment. In this study, we used Sentinel-1 Interferometric Synthetic Aperture Radar and Global Positioning System (GPS) data to estimate the source parameters of the 2018 Mw 7.2 Pinotepa, Mexico, earthquake. The results show that the earthquake ruptured both the seismogenic zone and a long-term SSE area, with two asperities ruptured during the event. GPS time-series data indicate that an SSE was initiated approximately during March 2017 below Oaxaca; the SSE ruptured an area below the source region of the Pinotepa earthquake and intruded into the seismogenic zone. The spatiotemporal proximity may suggest that the SSE triggered the Pinotepa earthquake. We propose that the triggering mechanism may either have been Coulomb stress loading or weakening of the source area by fluid migration. Furthermore, we calculated the seismic moment deficit and Coulomb failure stress changes and conclude that the Oaxaca area still has the potential for large earthquakes.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 110
Serial Issue: 3
Title: Geodetic model of the 2018 M (sub w) 7.2 Pinotepa, Mexico, earthquake inferred from InSAR and GPS data
Affiliation: China Earthquake Administration, Institute of Geology, Laboratory of Earthquake Dynamics, Beijing, China
Pages: 1115-1124
Published: 20200331
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 45
Accession Number: 2020-039344
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N15°00'00" - N19°00'00", W100°00'00" - W95°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202025
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