The 2016 Menyuan Earthquake: The Largest Self‐Arrested Crustal Earthquake Ever Observed

Author:

Xu Duyuan12ORCID,Gong Wenzheng12ORCID,Zhang Zhenguo12ORCID,Xu Jiankuan12ORCID,Yu Houyun12ORCID,Chen Xiaofei12ORCID

Affiliation:

1. Guangdong Provincial Key Laboratory of Geophysical High‐resolution Imaging Technology Southern University of Science and Technology Shenzhen China

2. Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen China

Abstract

AbstractThe 2016 Mw 5.9 Menyuan earthquake occurred near the Haiyuan fault system in the northeastern Tibetan plateau. Although some kinematic properties of this event have been investigated, more dynamic properties still need to be clarified. First, we use the empirical Green's function method to obtain this event's apparent source time functions (ASTFs), which present a bell shape with a duration of 3s and corresponding smooth spectra. We then conduct dynamic rupture simulations, which are well constrained by the seismic and geodetic observations, to explore more in‐depth source properties. The results show that the characteristics of ASTFs can be explained by the self‐arresting rupture model, which implies that the rupture propagation of this event may spontaneously terminate before reaching the barriers. This result suggests that the initial conditions when this earthquake nucleated may have controlled the rupture process. Our work contributes to understanding the stopping mechanism of some moderate earthquake ruptures.

Funder

National Natural Science Foundation of China

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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