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Numeric modeling of the strain accumulation and release of the 2008 Wenchuan, Sichuan, China, earthquake

Zhu Shoubiao and Zhang Peizhen
Numeric modeling of the strain accumulation and release of the 2008 Wenchuan, Sichuan, China, earthquake (in The 2008 Wenchuan, China earthquake, Anonymous)
Bulletin of the Seismological Society of America (November 2010) 100 (5B): 2825-2839

Abstract

As one of the most devastating earthquakes, the 2008 Wenchuan earthquake occurred on imbricate, high-angle listric-reverse faults. The faults dip approximately 70 degrees above 15 km depth, become 30 degrees to 40 degrees below approximately 15 km depth, and presumably root into a subhorizontal brittle-ductile transition zone below about 22+ or -2 km depth. In this paper we use the viscoelastic finite-element method to simulate coseismic deformation and stress change, and recurrence of major earthquakes associated with the high-angle listric-reverse fault. Our modeling shows that changes of coseismic equivalent stress mainly occur in the vicinity of the seismogenic fault, especially the hanging wall of the fault in the depth range above 12 km. Modeled coseismic slip distribution and modeled average recurrent interval corroborate with geological, geodetic, and seismological observations. We modeled 250,000 yr slip history of the fault slip. The result shows that minor slips, which obey slip-predictable model, take place on 30 degrees -40 degrees dipping fault plane at depth below 15 km. When the isotropic stress accumulation on the gentle fault reaches the critical level, the entire gently dipping fault ruptures to form a large slip. The large slips on the gently dipping fault comply with a time-predictable model of recurrences. These larger slips on the gently dipping fault occur simultaneously with slips on the steeply dipping fault and might have triggered slips on the steeply dipping fault to form great events such as the 2008 Wenchuan earthquake.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 100
Serial Issue: 5B
Title: Numeric modeling of the strain accumulation and release of the 2008 Wenchuan, Sichuan, China, earthquake
Title: The 2008 Wenchuan, China earthquake
Author(s): Zhu ShoubiaoZhang Peizhen
Author(s): Anonymous
Affiliation: China Earthquake Administration, Institute of Crustal Dynamics, Beijing, China
Pages: 2825-2839
Published: 201011
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 60
Accession Number: 2010-100840
Categories: Environmental geologySeismologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N26°00'00" - N34°10'00", E97°30'00" - E108°25'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201052
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