基于地壳变形观测资料分析广义海原断裂运动状态

doi:10.12196/j.issn.1000-3274.2022.04.002

Abstract

Abstract: Generalized Haiyuan fault includes Lenglongling fault, Jinqianghe fault, Maomaoshan fault, Laohushan fault and Haiyuan fault. Seismic and geological studies show that different fault segments of this fault are in different seismogenic stages. In this paper, constrained by the velocity of crustal movement observed by geodesy, the movement states of the above faults are determined by inversion. Firstly, the slip rates of different fault zones of generalized Haiyuan fault are calculated based on the viscoelastic seismic periodic deformation model. Then, the results are compared with the coseismic displacements of the Haiyuan M8.5 earthquake. Finally, the activity characteristics and motion states of the fault zone in different seismogenic stages are discussed. The inversion results show that the lockout degree of the seismogenic fault of Haiyuan M8.5 earthquake in 1920 is relatively low. The “Tianzhu empty segment” has a high degree of locking and weak fault movement. The locking degree is relatively high for the seismogenic fault of the Jingtai M7 earthquake in 1888, while is low for that of the M6.2 earthquake in 1990. The overall sliding rate of the generalized Haiyuan fault area is distributed in stages from west to east, and the result of displacement accumulation rate is corresponding to the seismogenic region of large earthquakes.

Key words: Generalized Haiyuan fault, GPS, Slip rate, VECD model

CLC Number:

P315.7

WANG Fei, DIAO Fa-qi, PAN Zheng-yang, SHAO Zhi-gang. Analysis of the Generalized Haiyuan Fault Motion State Based on Crustal Deformation Observation Data[J]. EARTHQUAKE, 2022, 42(4): 14-24.

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Analysis of the Generalized Haiyuan Fault Motion State Based on Crustal Deformation Observation Data

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