High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey points
The epicenter of the Luxian MS6.0 earthquake on September 16, 2021, was located in the southern Sichuan Basin, which is a historically seismically quiescent area. In recent years, the frequency of earthquakes has increased with the large-scale exploitation of shale gas. No evident surface fractures...
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KeAi Communications Co., Ltd.
2025-02-01
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674451924001071 |
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| author | Huili Guo Dahu Li Pingping Wu Qiyan Yang Ningbo Jiang Mi Gao Zhifeng Ding |
| author_facet | Huili Guo Dahu Li Pingping Wu Qiyan Yang Ningbo Jiang Mi Gao Zhifeng Ding |
| author_sort | Huili Guo |
| collection | DOAJ |
| description | The epicenter of the Luxian MS6.0 earthquake on September 16, 2021, was located in the southern Sichuan Basin, which is a historically seismically quiescent area. In recent years, the frequency of earthquakes has increased with the large-scale exploitation of shale gas. No evident surface fractures or seismic faults were observed after the Luxian earthquake. Based on high-quality data recorded by a dense seismic array composed of 70 portable stations with an average spacing of 2–3 km, a high-resolution seismic catalog was constructed for 7 days before and 36 days after the MS6.0 earthquake using LOC-FLOW, an effective workflow of phase picking, phase association, and earthquake location. Based on the new earthquake catalog, four earthquake clusters that occurred within the Yujiasi Syncline during this period were identified. Among them, the MS6.0 main earthquake sequence had a NW-SE trend and inclined towards the SW, with a length of approximately 8 km and width of 5 km. The MS6.0 earthquake sequence only appeared after the mainshock. The other three clusters were located in the northeast direction of the MS6.0 earthquake sequence, all of which were NE-SW trending strips and had no evident direct correlation with the MS6.0 mainshock. The focal depth was concentrated in the range of 2–7 km. Based on the seismic sequence profile and structural background, the MS6.0 seismic structure may be a blind buried fault zone with a NW strike composed of multiple small conjugate faults with NE and SW dip. The fault was not exposed on the surface and was related to the detachment structure in the deep part of the Sichuan Basin. |
| format | Article |
| id | doaj-art-25c7b39b3bb74252a67c627f6145c0cb |
| institution | Kabale University |
| issn | 1867-8777 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Earthquake Science |
| spelling | doaj-art-25c7b39b3bb74252a67c627f6145c0cb2024-12-19T10:53:01ZengKeAi Communications Co., Ltd.Earthquake Science1867-87772025-02-013813346High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey pointsHuili Guo0Dahu Li1Pingping Wu2Qiyan Yang3Ningbo Jiang4Mi Gao5Zhifeng Ding6Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; Corresponding author.Chengdu Institute of the Tibetan Plateau Earthquake Research, China Earthquake Administration (Chengdu Base of China Seismic Experimental Site), Chengdu 610041, China; Sichuan Earthquake Agency, Chengdu 610041, China; Corresponding author.Institute of Geophysics, China Earthquake Administration, Beijing 100081, ChinaKey Laboratory of Intelligent Detection and Equipment for Underground Space of Beijing-Tianjin-Hebei, Hebei GEO University, Shijiazhuang 050031, ChinaChengdu Institute of the Tibetan Plateau Earthquake Research, China Earthquake Administration (Chengdu Base of China Seismic Experimental Site), Chengdu 610041, China; Sichuan Earthquake Agency, Chengdu 610041, ChinaChengdu Institute of the Tibetan Plateau Earthquake Research, China Earthquake Administration (Chengdu Base of China Seismic Experimental Site), Chengdu 610041, China; Sichuan Earthquake Agency, Chengdu 610041, ChinaInstitute of Geophysics, China Earthquake Administration, Beijing 100081, ChinaThe epicenter of the Luxian MS6.0 earthquake on September 16, 2021, was located in the southern Sichuan Basin, which is a historically seismically quiescent area. In recent years, the frequency of earthquakes has increased with the large-scale exploitation of shale gas. No evident surface fractures or seismic faults were observed after the Luxian earthquake. Based on high-quality data recorded by a dense seismic array composed of 70 portable stations with an average spacing of 2–3 km, a high-resolution seismic catalog was constructed for 7 days before and 36 days after the MS6.0 earthquake using LOC-FLOW, an effective workflow of phase picking, phase association, and earthquake location. Based on the new earthquake catalog, four earthquake clusters that occurred within the Yujiasi Syncline during this period were identified. Among them, the MS6.0 main earthquake sequence had a NW-SE trend and inclined towards the SW, with a length of approximately 8 km and width of 5 km. The MS6.0 earthquake sequence only appeared after the mainshock. The other three clusters were located in the northeast direction of the MS6.0 earthquake sequence, all of which were NE-SW trending strips and had no evident direct correlation with the MS6.0 mainshock. The focal depth was concentrated in the range of 2–7 km. Based on the seismic sequence profile and structural background, the MS6.0 seismic structure may be a blind buried fault zone with a NW strike composed of multiple small conjugate faults with NE and SW dip. The fault was not exposed on the surface and was related to the detachment structure in the deep part of the Sichuan Basin.http://www.sciencedirect.com/science/article/pii/S1674451924001071Luxian MS6.0 earthquakeearthquake relocationseismogenic fault |
| spellingShingle | Huili Guo Dahu Li Pingping Wu Qiyan Yang Ningbo Jiang Mi Gao Zhifeng Ding High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey points Earthquake Science Luxian MS6.0 earthquake earthquake relocation seismogenic fault |
| title | High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey points |
| title_full | High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey points |
| title_fullStr | High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey points |
| title_full_unstemmed | High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey points |
| title_short | High resolution catalog of the Luxian (Sichuan, China) MS6.0 earthquake sequence and analysis of the seismogenic structuresKey points |
| title_sort | high resolution catalog of the luxian sichuan china ms6 0 earthquake sequence and analysis of the seismogenic structureskey points |
| topic | Luxian MS6.0 earthquake earthquake relocation seismogenic fault |
| url | http://www.sciencedirect.com/science/article/pii/S1674451924001071 |
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