Structural Heterogeneity Controlled Rupture Process of the 2021 Mw 7.1 Fukushima, Japan, Earthquake Revealed by Joint Inversion of Seismic and Geodetic Data

Author:

Tan Yuyang1ORCID,Gu Ning2ORCID,Xing Huilin13,Zhang Yong4,Jin Zongwei1,Hua Sibo4,Wang Jianchao1,Qin Mutian1ORCID,Pang Shuo1,Li Sanzhong13

Affiliation:

1. 1Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques MOE, College of Marine Geosciences, Ocean University of China, Qingdao, China

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

3. 3Laoshan Laboratory, Qingdao, China

4. 4School of Earth and Space Sciences, Peking University, Beijing, China

Abstract

Abstract We determined the rupture model of the 2021 Mw 7.1 Fukushima earthquake near northeastern Japan in this study and adopted this model to investigate the cause of this earthquake and its aftershocks. The rupture model was obtained through joint inversion of teleseismic, strong-motion and geodetic data. It is shown that the slips were predominantly distributed on the southwest side of the earthquake epicenter, indicating a unilateral rupture event. We observed that the seismic moment was released in three time periods, producing four slip patches on the fault plane. Through comparison, we demonstrated that our joint inversion model was more reliable in describing the rupture process of the Fukushima earthquake than the automatic inversion models determined using only strong-motion data. By jointly analyzing the slip distribution and seismic velocity structure, we found a good correlation between the slip patches and VP/VS anomalies, suggesting that structural heterogeneities along the fault zone played a critical role in controlling the rupture process of the Fukushima earthquake. In addition, most aftershocks were located in the region characterized by small slips and high VP/VS, and we demonstrated that they were caused by stress changes due to the presence of fluids and the rupture of the mainshock.

Publisher

Seismological Society of America (SSA)

Subject

Geophysics

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