Spherical-earth finite element model of coseismic slip distribution during the 2010 Mentawai earthquake

Prasidya, Anindya Sricandra and Panuntun, Hidayat and Taftazani, Muhammad Iqbal (2021) Spherical-earth finite element model of coseismic slip distribution during the 2010 Mentawai earthquake. Geodesy and Geodynamics, 12 (2). 155 – 164. ISSN 16749847

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Abstract

The moment magnitude (MW) 7.8 earthquake occurred along the Mentawai seismic region of Sunda Trench on 25 October 2010, which is classified as the tsunami earthquake. The GPS inversion results under the assumption of simple horizontal layered medium show that the slip near the trench is not apparent, which is inconsistent with our understanding of tsunami earthquake. Here, we construct a spherical-earth finite element model (FEM) to investigate the coseismic slip distribution of the 2010 Mentawai earthquake by geometrically combining the subducting plate with a precise subduction interface. The FEM-based coseismic slip distribution shows that there are three major slip patches on the fault interface, one is located on the shallow region and the other two are located on the deeper part of the fault plane. The largest slip patch is located near the trench with the depth less than 10 km, and the maximum amplitude is about 12 m. This significant near-trench slip is consistent with the tsunami earthquake studies. A more realistic domain of FEM is used to change the coseismic slip distribution, thus significantly improving the fitting degree of the data model. These findings suggest that the FEM-derived Green's function is essential to image a more robust and realistic coseismic slip distribution of the large earthquake in the subduction zone. © 2021 The Authors

Item Type: Article
Additional Information: Cited by: 2; All Open Access, Gold Open Access
Uncontrolled Keywords: Indian Ocean; Java Trench; coseismic process; earthquake event; earthquake magnitude; fault zone; finite element method; GPS; slip rate; tsunami
Subjects: Q Science > Q Science (General)
Q Science > QE Geology
Divisions: Vocational School
Depositing User: Sri JUNANDI
Date Deposited: 22 Oct 2024 00:47
Last Modified: 22 Oct 2024 00:47
URI: https://ir.lib.ugm.ac.id/id/eprint/5346

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