Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang Earthquake
On 12 June 2021, an earthquake with M<sub>S</sub> 5.0 occurred in Yingjiang, adjacent to eastern Myanmar, where seismic activity is frequent due to plate collision. To explore the mechanism of this earthquake, the regional stress field of the Yingjiang zone was inverted using the focal m...
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MDPI AG
2023-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/2/957 |
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| author | Aitang Li Chaodi Xie Yingfeng Ji Weiling Zhu Yan Xu Guangming Wang Xiaoyan Zhao |
| author_facet | Aitang Li Chaodi Xie Yingfeng Ji Weiling Zhu Yan Xu Guangming Wang Xiaoyan Zhao |
| author_sort | Aitang Li |
| collection | DOAJ |
| description | On 12 June 2021, an earthquake with M<sub>S</sub> 5.0 occurred in Yingjiang, adjacent to eastern Myanmar, where seismic activity is frequent due to plate collision. To explore the mechanism of this earthquake, the regional stress field of the Yingjiang zone was inverted using the focal mechanisms of 187 historical earthquakes in this area. Furthermore, based on the obtained orientation of the principal stress axes and the stress shape ratio, the fault slip tendency (Ts) was also estimated to evaluate fault instability in the study area. The stress variation results show that the diffusion and migration of the aftershocks suggested strike–slip-type stress accumulation in Yingjiang with a principal compressive stress axis direction-oriented NNE–SSW. Fault slip tendency results show that the seismogenic faults feature strikes within the ranges of 40~80° and 110~150° and dips of 60~90° and exhibit enhanced stress coupling. The distribution of the aftershock sequence is conjectured to have a high correlation with local fluid migration and was likely controlled by the hydrated rock-induced ruptures of the stressed fault systems near the source region. This study provides insights into potential earthquake risks in this region. |
| first_indexed | 2024-03-09T13:43:09Z |
| format | Article |
| id | doaj.art-4ced04eee7b5472a9d10520fe1c2019c |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T13:43:09Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-4ced04eee7b5472a9d10520fe1c2019c2023-11-30T21:04:08ZengMDPI AGApplied Sciences2076-34172023-01-0113295710.3390/app13020957Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang EarthquakeAitang Li0Chaodi Xie1Yingfeng Ji2Weiling Zhu3Yan Xu4Guangming Wang5Xiaoyan Zhao6Geophysics Department, School of Earth Sciences, Yunnan University, Kunming 650091, ChinaGeophysics Department, School of Earth Sciences, Yunnan University, Kunming 650091, ChinaState Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, ChinaState Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, ChinaGeophysics Department, School of Earth Sciences, Yunnan University, Kunming 650091, ChinaYunnan Earthquake Administration, Kunming 650224, ChinaYunnan Earthquake Administration, Kunming 650224, ChinaOn 12 June 2021, an earthquake with M<sub>S</sub> 5.0 occurred in Yingjiang, adjacent to eastern Myanmar, where seismic activity is frequent due to plate collision. To explore the mechanism of this earthquake, the regional stress field of the Yingjiang zone was inverted using the focal mechanisms of 187 historical earthquakes in this area. Furthermore, based on the obtained orientation of the principal stress axes and the stress shape ratio, the fault slip tendency (Ts) was also estimated to evaluate fault instability in the study area. The stress variation results show that the diffusion and migration of the aftershocks suggested strike–slip-type stress accumulation in Yingjiang with a principal compressive stress axis direction-oriented NNE–SSW. Fault slip tendency results show that the seismogenic faults feature strikes within the ranges of 40~80° and 110~150° and dips of 60~90° and exhibit enhanced stress coupling. The distribution of the aftershock sequence is conjectured to have a high correlation with local fluid migration and was likely controlled by the hydrated rock-induced ruptures of the stressed fault systems near the source region. This study provides insights into potential earthquake risks in this region.https://www.mdpi.com/2076-3417/13/2/957Yingjiangstress inversionslip tendencyfault activity |
| spellingShingle | Aitang Li Chaodi Xie Yingfeng Ji Weiling Zhu Yan Xu Guangming Wang Xiaoyan Zhao Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang Earthquake Applied Sciences Yingjiang stress inversion slip tendency fault activity |
| title | Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang Earthquake |
| title_full | Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang Earthquake |
| title_fullStr | Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang Earthquake |
| title_full_unstemmed | Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang Earthquake |
| title_short | Stress Inversion and Fault Instability in the Source Region of the 2021 (M<sub>S</sub> 5.0) Yingjiang Earthquake |
| title_sort | stress inversion and fault instability in the source region of the 2021 m sub s sub 5 0 yingjiang earthquake |
| topic | Yingjiang stress inversion slip tendency fault activity |
| url | https://www.mdpi.com/2076-3417/13/2/957 |
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