2019年6月17日四川长宁6.0级地震震后应力演化与余震关系

李平恩; 廖力; 奉建州

doi:10.3799/dqkx.2021.143

Volume 47 Issue 6

Jun. 2022

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Li Ping’en, Liao Li, Feng Jianzhou, 2022. Relationship between Stress Evolution and Aftershocks after Changning M 6.0 Earthquake in Sichuan on 17 June, 2019. Earth Science, 47(6): 2149-2164. doi: 10.3799/dqkx.2021.143

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Li Ping’en, Liao Li, Feng Jianzhou, 2022. Relationship between Stress Evolution and Aftershocks after Changning M 6.0 Earthquake in Sichuan on 17 June, 2019. Earth Science, 47(6): 2149-2164. doi: 10.3799/dqkx.2021.143

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Relationship between Stress Evolution and Aftershocks after Changning M 6.0 Earthquake in Sichuan on 17 June, 2019

doi: 10.3799/dqkx.2021.143

Li Ping’en^{1, 2
,
,},
Liao Li^{1, 2},
Feng Jianzhou^{1, 2}

1.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2.
Beijing Baijiatuan Earth Sciences National Observation and Research Station, Beijing 100095, China

Received Date: 2021-06-11
Publish Date: 2022-06-25

Abstract

Abstract

On 17 June, 2019, an M 6.0 earthquake occurred in Changning County, Sichuan Province, with high aftershock activity frequency and intensity. And among the aftershocks, there are 4 strong ones with M≥5.0, which is different from the previous M 6.0 earthquakes. The aftershock activity is closely related to the regional stress change after the mainshock. In order to study the relationship between them, a 3D viscoelastic finite element model of the lithosphere in the Changning area is established. In the model, the main active structures, topographic relief and deep inversion results were considered. By using numerical method, the present tectonic background stress field in the study area is reconstructed to conform to the GPS observed value and the measured one of maximum horizontal principal compressive stress direction. Then the Changning M 6.0 earthquake and its strong aftershock sequence with M≥5.0 were simulated sequentially. The relationship between the stress evolution and aftershocks, as well as the mainshock and the strong aftershock sequence with M≥5.0 were studied by calculating the Coulomb failure stress. The results show that the occurrence of the Changning M 6.0 earthquake may be independent with the regional tectonic loading factors, and the aftershock activity is obviously controlled by the regional stress change after the mainshock. After the Changning earthquake, the stress at the depth of 10 km in the Yutan-Changning anticline was fully released, and the Coulomb failure stress decreased significantly. However, at the depth of 3 km, the Coulomb failure stress increases obviously and the stress level is still high.
- Changning M 6.0 earthquake,
- stress evolution after earthquake,
- aftershock activity,
- coulomb failure stress,
- finite element method,
- geophysics

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References(48)

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Relationship between Stress Evolution and Aftershocks after Changning M 6.0 Earthquake in Sichuan on 17 June, 2019

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