Estimation of the Nucleation Location and Rupture Extent of the 1850 Xichang, Sichuan, China, Earthquake by Dynamic Rupture Simulations on a Multi-Segment Stepover Structure

Yu, Houyun1,2,3; Zhang, Zhenguo1,2,3; Hu, Feng4; Xu, Duyuan1,2,3; Chen, Xiaofei1,2,3

2023-06-01

10.1029/2022EA002775

EARTH AND SPACE SCIENCE   影响因子和分区

2333-5084

We simulated the rupture dynamics and ground motion of the 1850 Xichang, China, earthquake on the Zemuhe fault, which consists of the Lijinbao segment, the Dajing segment, the Chechejie segment, and the Songxin segment, with the curved grid finite-difference method, and compared the simulation results with the field observed data and written records inferred data. We focused on the rupture extent of this earthquake and the effects of the maximum principal stress azimuth and nucleation location on the rupture process and the corresponding damage distribution. Numerical simulation results suggest that the regional maximum principal stress orientation that surrounds the Zemuhe fault was approximately N55 degrees W, which is identical with the azimuth from the stress relief experiment in the neighboring area. Our simulations further imply that the nucleation location is under Lanbiluo. The simulation of this preferred nucleation location model suggests that the rupture propagated through the entire Dajing segment and the Chechejie segment, and the rupture gradually arrested at shallow depths after it transferred to the Lijinbao segment and the Songxin segment. Moreover, the simulation suggests that the rupture on the Chechejie segment was initiated at the surface and then mainly propagated downward due to the free surface effect. In addition, the Xichang earthquake may have exhibited a low rupture velocity on the Dajing segment. Furthermore, our simulation results emphasize the importance of the stepover width in the earthquake dynamics.

Xichang earthquake rupture dynamics stepover structure rupture extent

SCI

英语

第一 ; 通讯

National Key Research and Development Program of China[2021YFC3000702] ; National Natural Science Foundation of China["U1901602","42174057","42074049"] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0203] ; Shenzhen Science and Technology Program[KQTD20170810111725321] ; leading talents of Guangdong province program[2016LJ06N652] ; Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology[2022B1212010002] ; Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology[ZDSYS20190902093007855]

Astronomy & Astrophysics ; Geology

Astronomy & Astrophysics ; Geosciences, Multidisciplinary

WOS:001009857700001

AMER GEOPHYSICAL UNION

Web of Science

1.Southern Univ Sci & Technol, Guangdong Prov Key Lab Geophys High Resolut Imagin, Shenzhen, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Deep Offshore Oil & Gas Explorat, Shenzhen, Peoples R China
3.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
4.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China

Yu, Houyun,Zhang, Zhenguo,Hu, Feng,et al. Estimation of the Nucleation Location and Rupture Extent of the 1850 Xichang, Sichuan, China, Earthquake by Dynamic Rupture Simulations on a Multi-Segment Stepover Structure[J]. EARTH AND SPACE SCIENCE,2023,10(6).

Yu, Houyun,Zhang, Zhenguo,Hu, Feng,Xu, Duyuan,&Chen, Xiaofei.(2023).Estimation of the Nucleation Location and Rupture Extent of the 1850 Xichang, Sichuan, China, Earthquake by Dynamic Rupture Simulations on a Multi-Segment Stepover Structure.EARTH AND SPACE SCIENCE,10(6).

Yu, Houyun,et al."Estimation of the Nucleation Location and Rupture Extent of the 1850 Xichang, Sichuan, China, Earthquake by Dynamic Rupture Simulations on a Multi-Segment Stepover Structure".EARTH AND SPACE SCIENCE 10.6(2023).