Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey points
Monitoring the evolution of foreshocks can be a valuable way to analyze the nucleation process. Foreshocks accompanying moderate mainshocks have been recorded in the west of Yunnan Province, China. We obtain the earthquake catalog and source parameters of the 2016 Yunlong foreshocks, and discuss the...
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KeAi Communications Co., Ltd.
2025-08-01
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| Series: | Earthquake Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674451925000217 |
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| author | Gaohua Zhu Hongfeng Yang Yingying Zhang |
| author_facet | Gaohua Zhu Hongfeng Yang Yingying Zhang |
| author_sort | Gaohua Zhu |
| collection | DOAJ |
| description | Monitoring the evolution of foreshocks can be a valuable way to analyze the nucleation process. Foreshocks accompanying moderate mainshocks have been recorded in the west of Yunnan Province, China. We obtain the earthquake catalog and source parameters of the 2016 Yunlong foreshocks, and discuss the implications for the nucleation processes of the earthquake in western Yunnan, China. By using the matched filter detection, we identify 343 foreshocks with a magnitude of −0.8−4.5, starting with a magnitude 1.0 foreshock approximately 3 months before the 2016 MS5.1 Yunlong mainshock. The spatial distribution of foreshocks doesn’t show localization or directional migration towards the mainshock. Coulomb stress analysis suggests a positive stress perturbation at the mainshock nucleate area. These observations indicate a cascade-triggering mechanism of the 2016 Yunlong earthquakes. We further collect published catalogs of 2021 Yangbi and 2017 Yangbi foreshocks in the adjacent area, and analyze the temporal changes in b values. The temporal changes in b values reveal precursory drops before the mainshocks. |
| format | Article |
| id | doaj-art-4e7533aa759c4743a193305fe38f663d |
| institution | Kabale University |
| issn | 1867-8777 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Earthquake Science |
| spelling | doaj-art-4e7533aa759c4743a193305fe38f663d2025-08-20T03:32:01ZengKeAi Communications Co., Ltd.Earthquake Science1867-87772025-08-0138436337410.1016/j.eqs.2025.03.003Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey pointsGaohua Zhu0Hongfeng Yang1Yingying Zhang2Key Laboratory of Ocean Observation and Forecasting, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Geology, Qingdao Marine Science and Technology Center, Qingdao 266237, ChinaDepartment of Earth and Environmental Science, Faculty of Science, The Chinese University of Hong Kong, Shatin, Hong Kong 999077, China; Corresponding author.China Earthquake Networks Center, Beijing 100045, ChinaMonitoring the evolution of foreshocks can be a valuable way to analyze the nucleation process. Foreshocks accompanying moderate mainshocks have been recorded in the west of Yunnan Province, China. We obtain the earthquake catalog and source parameters of the 2016 Yunlong foreshocks, and discuss the implications for the nucleation processes of the earthquake in western Yunnan, China. By using the matched filter detection, we identify 343 foreshocks with a magnitude of −0.8−4.5, starting with a magnitude 1.0 foreshock approximately 3 months before the 2016 MS5.1 Yunlong mainshock. The spatial distribution of foreshocks doesn’t show localization or directional migration towards the mainshock. Coulomb stress analysis suggests a positive stress perturbation at the mainshock nucleate area. These observations indicate a cascade-triggering mechanism of the 2016 Yunlong earthquakes. We further collect published catalogs of 2021 Yangbi and 2017 Yangbi foreshocks in the adjacent area, and analyze the temporal changes in b values. The temporal changes in b values reveal precursory drops before the mainshocks.http://www.sciencedirect.com/science/article/pii/S1674451925000217foreshocksYunlong mainshockearthquake detection and location |
| spellingShingle | Gaohua Zhu Hongfeng Yang Yingying Zhang Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey points Earthquake Science foreshocks Yunlong mainshock earthquake detection and location |
| title | Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey points |
| title_full | Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey points |
| title_fullStr | Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey points |
| title_full_unstemmed | Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey points |
| title_short | Foreshocks of the 2016 MS5.1 Yunlong earthquake in Western Yunnan, China, and implications for earthquake nucleationKey points |
| title_sort | foreshocks of the 2016 ms5 1 yunlong earthquake in western yunnan china and implications for earthquake nucleationkey points |
| topic | foreshocks Yunlong mainshock earthquake detection and location |
| url | http://www.sciencedirect.com/science/article/pii/S1674451925000217 |
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