Initial rupture sequence and rupture history of the 2008 Wenchuan earthquake from a kinematic perspective

Deyu Yin (), Lei Zeng (), Yadong Chen (), Shouhua Liu (), Yongzhen Cheng (), Qifang Liu () and Lu Qian ()
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Deyu Yin: Huaiyin Institute of Technology
Lei Zeng: Huaiyin Institute of Technology
Yadong Chen: Huaiyin Institute of Technology
Shouhua Liu: Huaiyin Institute of Technology
Yongzhen Cheng: Huaiyin Institute of Technology
Qifang Liu: University of Science and Technology
Lu Qian: Huaiyin Institute of Technology

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2024, vol. 120, issue 15, No 28, 14409-14430

Abstract: Abstract Based on the three-dimensional seismic structure model, aftershock distribution, and surface rupture investigation, a reasonable three-dimensional fault model was established. Two possible rupture patterns were adopted, and based on parallel non negative least squares method and multi time window technology, combined with far field, near field, GPS, and surface rupture data, the precise rupture process of the Wenchuan earthquake was inverted, and a reasonable rupture pattern was provided. The results are as follows: (1) Near field records are crucial for identifying the details of rupture process. The occurrence of bilateral rupture at the intersection of the Beichuan fault with high dip angles and the Xiaoyudong fault is more in line with the actual situation. When the bilateral rupture occurs, dislocations that match the observed surface rupture are generated in the near surface area from Hongkou to Yingxiu. The synthetic records amplitude of the station in the near field behind the rupture direction is closer to the observation record. (2) The possible sequence of fault rupture in the initial rupture point area is the rupture located at a low dip angle (33°) in the deep part of the Beichuan fault propagates downwards, causing the deep rupture of the Beichuan fault (20°), while the upward propagation stimulates the rupture of the Pengguan fault (33°). The propagation of Pengguan fault rupture to the northeast resulted in the rupture of the Xiaoyudong fault, which in turn caused the bilateral rupture of the high dip area in the shallow part of the Beichuan fault (65° and 50°). (3) The joint inversion results show that the duration of the Wenchuan earthquake rupture reached 100 s, and the released seismic moment was 1.058 × 1021 N m. There are 5 asperities on the fault plane, indicating that this earthquake is composed of at least 5 subevents. The slip is mainly distributed on the Beichuan fault, indicating that the Beichuan fault is the main rupture plane.

Keywords: Wenchuan earthquake; Joint inversion; Rupture pattern; Rupture process; Asperity (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s11069-024-06784-x

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