Study on the risk background of strong earthquake in Kangding-Moxi fault, Sichuan
In this paper, the strong earthquake risk of the Kangding-Moxi fault, located within the Xianshuihe fault zone in western Sichuan, is analyzed and discussed. The fault at the apex of the third arc extrusion structural belt extends from western Sichuan to eastern Yunnan. This area is characterized by...
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Editorial Office of Progress in Earthquake Sciences
2024-10-01
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| Series: | 地震科学进展 |
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| Online Access: | https://www.gjdzdt.cn/en/article/doi/10.19987/j.dzkxjz.2023-008 |
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| author | Wenlin Huan Meng Zhang Hua Pan |
| author_facet | Wenlin Huan Meng Zhang Hua Pan |
| author_sort | Wenlin Huan |
| collection | DOAJ |
| description | In this paper, the strong earthquake risk of the Kangding-Moxi fault, located within the Xianshuihe fault zone in western Sichuan, is analyzed and discussed. The fault at the apex of the third arc extrusion structural belt extends from western Sichuan to eastern Yunnan. This area is characterized by high stress concentration, substantial left-lateral slip, and a vertical differential movement between the two sides of the fault ranging from 1000 to 2000 meters. It is one of the most seismically active regions within the continental plate. The Xianshuihe fault zone is a left-lateral strike-slip fault zone with high seismicity and earthquake recurrence in China. Over the nearly 300 years since 1725, two periods of seismicity have repeatedly occurred on the Xianshuihe fault zone, with recurrence intervals of 100 to 200 years. The Kangding-Moxi fault was the site of a major earthquake, with a magnitude of 7¾, in 1786. It has been 237 years since that event, and the fault has been in a relatively quiet phase of energy accumulation. However, recent earthquakes have become active. Following the MS6.8 Moxi earthquake in Luding, Sichuan Province in September 2022, medium and small earthquakes with M<5.6 occurred frequently and along the Moxi fault. This raises the question of whether the fault is reactivating and entering a new period of seismic activity. These characteristics indicate that the Kangding-Moxi fault has the background conditions for the occurrence of large earthquakes. |
| format | Article |
| id | doaj-art-853b1d1d1a7b4809af0141a6c03f9057 |
| institution | OA Journals |
| issn | 2096-7780 |
| language | zho |
| publishDate | 2024-10-01 |
| publisher | Editorial Office of Progress in Earthquake Sciences |
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| series | 地震科学进展 |
| spelling | doaj-art-853b1d1d1a7b4809af0141a6c03f90572025-08-20T01:47:21ZzhoEditorial Office of Progress in Earthquake Sciences地震科学进展2096-77802024-10-01541067167910.19987/j.dzkxjz.2023-0082023-008Study on the risk background of strong earthquake in Kangding-Moxi fault, SichuanWenlin Huan0Meng Zhang1Hua Pan2Institute of Geophysics, China Earthquake Administration, Beijing 100081, ChinaInstitute of Geophysics, China Earthquake Administration, Beijing 100081, ChinaInstitute of Geophysics, China Earthquake Administration, Beijing 100081, ChinaIn this paper, the strong earthquake risk of the Kangding-Moxi fault, located within the Xianshuihe fault zone in western Sichuan, is analyzed and discussed. The fault at the apex of the third arc extrusion structural belt extends from western Sichuan to eastern Yunnan. This area is characterized by high stress concentration, substantial left-lateral slip, and a vertical differential movement between the two sides of the fault ranging from 1000 to 2000 meters. It is one of the most seismically active regions within the continental plate. The Xianshuihe fault zone is a left-lateral strike-slip fault zone with high seismicity and earthquake recurrence in China. Over the nearly 300 years since 1725, two periods of seismicity have repeatedly occurred on the Xianshuihe fault zone, with recurrence intervals of 100 to 200 years. The Kangding-Moxi fault was the site of a major earthquake, with a magnitude of 7¾, in 1786. It has been 237 years since that event, and the fault has been in a relatively quiet phase of energy accumulation. However, recent earthquakes have become active. Following the MS6.8 Moxi earthquake in Luding, Sichuan Province in September 2022, medium and small earthquakes with M<5.6 occurred frequently and along the Moxi fault. This raises the question of whether the fault is reactivating and entering a new period of seismic activity. These characteristics indicate that the Kangding-Moxi fault has the background conditions for the occurrence of large earthquakes.https://www.gjdzdt.cn/en/article/doi/10.19987/j.dzkxjz.2023-008kangding-moxi faultxianshuihe fault zonexianshuihe-eastern yunnan extrusion structureseismicity repetition periodlarge earthquake hazard |
| spellingShingle | Wenlin Huan Meng Zhang Hua Pan Study on the risk background of strong earthquake in Kangding-Moxi fault, Sichuan 地震科学进展 kangding-moxi fault xianshuihe fault zone xianshuihe-eastern yunnan extrusion structure seismicity repetition period large earthquake hazard |
| title | Study on the risk background of strong earthquake in Kangding-Moxi fault, Sichuan |
| title_full | Study on the risk background of strong earthquake in Kangding-Moxi fault, Sichuan |
| title_fullStr | Study on the risk background of strong earthquake in Kangding-Moxi fault, Sichuan |
| title_full_unstemmed | Study on the risk background of strong earthquake in Kangding-Moxi fault, Sichuan |
| title_short | Study on the risk background of strong earthquake in Kangding-Moxi fault, Sichuan |
| title_sort | study on the risk background of strong earthquake in kangding moxi fault sichuan |
| topic | kangding-moxi fault xianshuihe fault zone xianshuihe-eastern yunnan extrusion structure seismicity repetition period large earthquake hazard |
| url | https://www.gjdzdt.cn/en/article/doi/10.19987/j.dzkxjz.2023-008 |
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