Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China
The 2022 MS 6.8 Luding earthquake is the strongest earthquake in Sichuan Province, Western China, since the 2017 MS 7.0 Jiuzhaigou earthquake. It occurred on the Moxi fault in the southeastern segment of the Xianshuihe fault, a tectonically active and mountainous region with severe secondary earthqu...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co. Ltd.
2023-01-01
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| Series: | Earthquake Research Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772467022000756 |
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| author | Yanru An Dun Wang Qiang Ma Yueren Xu Yu Li Yingying Zhang Zhumei Liu Chunmei Huang Jinrong Su Jilong Li Mingxiao Li Wenkai Chen Zhifan Wan Dengjie Kang Baoshan Wang |
| author_facet | Yanru An Dun Wang Qiang Ma Yueren Xu Yu Li Yingying Zhang Zhumei Liu Chunmei Huang Jinrong Su Jilong Li Mingxiao Li Wenkai Chen Zhifan Wan Dengjie Kang Baoshan Wang |
| author_sort | Yanru An |
| collection | DOAJ |
| description | The 2022 MS 6.8 Luding earthquake is the strongest earthquake in Sichuan Province, Western China, since the 2017 MS 7.0 Jiuzhaigou earthquake. It occurred on the Moxi fault in the southeastern segment of the Xianshuihe fault, a tectonically active and mountainous region with severe secondary earthquake disasters. To better understand the seismogenic mechanism and provide scientific support for future hazard mitigation, we summarize the preliminary results of the Luding earthquake, including seismotectonic background, seismicity and mainshock source characteristics and aftershock properties, and direct and secondary damage associated with the mainshock. The peak ground displacements in the NS and EW directions observed by the nearest GNSS station SCCM are ∼35 mm and ∼55 mm, respectively, resulting in the maximum coseismic dislocation of 20 mm along the NWW direction, which is consistent with the sinistral slip on the Xianshuihe fault. Back-projection of teleseismic P waves suggest that the mainshock rupture propagated toward south-southeast. The seismic intensity of the mainshock estimated from the back-projection results indicates a Mercalli scale of VIII or above near the ruptured area, consistent with the results from instrumental measurements and field surveys. Numerous aftershocks were reported, with the largest being MS 4.5. Aftershock locations (up to September 18, 2022) exhibit 3 clusters spanning an area of 100 km long and 30 km wide. The magnitude and rate of aftershocks decreased as expected, and the depths became shallower with time. The mainshock and two aftershocks show left-lateral strike-slip focal mechanisms. For the aftershock sequence, the b-value from the Gutenberg-Richter frequency-magnitude relationship, h-value, and p-value for Omori’s law for aftershock decay are 0.81, 1.4, and 1.21, respectively, indicating that this is a typical mainshock-aftershock sequence. The low b-value implies high background stress in the hypocenter region. Analysis from remote sensing satellite images and UAV data shows that the distribution of earthquake-triggered landslides was consistent with the aftershock area. Numerous small-size landslides with limited volumes were revealed, which damaged or buried the roads and severely hindered the rescue process. |
| first_indexed | 2024-04-10T07:28:01Z |
| format | Article |
| id | doaj.art-cfc838cda9dd470299c5e0c57247133b |
| institution | Directory Open Access Journal |
| issn | 2772-4670 |
| language | English |
| last_indexed | 2024-04-10T07:28:01Z |
| publishDate | 2023-01-01 |
| publisher | KeAi Communications Co. Ltd. |
| record_format | Article |
| series | Earthquake Research Advances |
| spelling | doaj.art-cfc838cda9dd470299c5e0c57247133b2023-02-24T04:32:04ZengKeAi Communications Co. Ltd.Earthquake Research Advances2772-46702023-01-0131100184Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, ChinaYanru An0Dun Wang1Qiang Ma2Yueren Xu3Yu Li4Yingying Zhang5Zhumei Liu6Chunmei Huang7Jinrong Su8Jilong Li9Mingxiao Li10Wenkai Chen11Zhifan Wan12Dengjie Kang13Baoshan Wang14Institute of Geophysics, China Earthquake Administration, Beijing, China; China Earthquake Networks Center, Beijing, China; Corresponding author. Institute of Geophysics, China Earthquake Administration, Beijing, China.Badong National Observation and Research Station of Geohazards, School of Earth Sciences, China University of Geosciences Wuhan, Wuhan, ChinaKey Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, ChinaInstitute of Earthquake Forecasting, China Earthquake Administration, Beijing, ChinaChina Earthquake Networks Center, Beijing, ChinaChina Earthquake Networks Center, Beijing, ChinaHubei Key Laboratory of Earthquake Early Warning, Hubei Earthquake Agency, Hubei, ChinaSichuan Earthquake Agency, Chengdu, ChinaSichuan Earthquake Agency, Chengdu, ChinaKey Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, ChinaChina Earthquake Networks Center, Beijing, ChinaLanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, ChinaBadong National Observation and Research Station of Geohazards, School of Earth Sciences, China University of Geosciences Wuhan, Wuhan, ChinaLanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, ChinaSchool of Earth and Space Sciences, University of Science and Technology of China, Hefei, ChinaThe 2022 MS 6.8 Luding earthquake is the strongest earthquake in Sichuan Province, Western China, since the 2017 MS 7.0 Jiuzhaigou earthquake. It occurred on the Moxi fault in the southeastern segment of the Xianshuihe fault, a tectonically active and mountainous region with severe secondary earthquake disasters. To better understand the seismogenic mechanism and provide scientific support for future hazard mitigation, we summarize the preliminary results of the Luding earthquake, including seismotectonic background, seismicity and mainshock source characteristics and aftershock properties, and direct and secondary damage associated with the mainshock. The peak ground displacements in the NS and EW directions observed by the nearest GNSS station SCCM are ∼35 mm and ∼55 mm, respectively, resulting in the maximum coseismic dislocation of 20 mm along the NWW direction, which is consistent with the sinistral slip on the Xianshuihe fault. Back-projection of teleseismic P waves suggest that the mainshock rupture propagated toward south-southeast. The seismic intensity of the mainshock estimated from the back-projection results indicates a Mercalli scale of VIII or above near the ruptured area, consistent with the results from instrumental measurements and field surveys. Numerous aftershocks were reported, with the largest being MS 4.5. Aftershock locations (up to September 18, 2022) exhibit 3 clusters spanning an area of 100 km long and 30 km wide. The magnitude and rate of aftershocks decreased as expected, and the depths became shallower with time. The mainshock and two aftershocks show left-lateral strike-slip focal mechanisms. For the aftershock sequence, the b-value from the Gutenberg-Richter frequency-magnitude relationship, h-value, and p-value for Omori’s law for aftershock decay are 0.81, 1.4, and 1.21, respectively, indicating that this is a typical mainshock-aftershock sequence. The low b-value implies high background stress in the hypocenter region. Analysis from remote sensing satellite images and UAV data shows that the distribution of earthquake-triggered landslides was consistent with the aftershock area. Numerous small-size landslides with limited volumes were revealed, which damaged or buried the roads and severely hindered the rescue process.http://www.sciencedirect.com/science/article/pii/S2772467022000756Luding earthquakeMoxi faultAftershock statisticsEarthquake disastersIntensity map |
| spellingShingle | Yanru An Dun Wang Qiang Ma Yueren Xu Yu Li Yingying Zhang Zhumei Liu Chunmei Huang Jinrong Su Jilong Li Mingxiao Li Wenkai Chen Zhifan Wan Dengjie Kang Baoshan Wang Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China Earthquake Research Advances Luding earthquake Moxi fault Aftershock statistics Earthquake disasters Intensity map |
| title | Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China |
| title_full | Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China |
| title_fullStr | Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China |
| title_full_unstemmed | Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China |
| title_short | Preliminary report of the September 5, 2022 MS 6.8 Luding earthquake, Sichuan, China |
| title_sort | preliminary report of the september 5 2022 ms 6 8 luding earthquake sichuan china |
| topic | Luding earthquake Moxi fault Aftershock statistics Earthquake disasters Intensity map |
| url | http://www.sciencedirect.com/science/article/pii/S2772467022000756 |
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