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Research on the relationshipbetween geophysical structural features and earthquakes in Mid-Yunnan and the surrounding area

Research on the relationshipbetween geophysical structural features and earthquakes in Mid-Yunnan and the surrounding area
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摘要 In this study,we analyzed the gravity and,magnetic characteristics,and the occurrence of a fault zone and discussed the relationships between the two locations.The results reveal that the subsurface structures strikes are different compared with those in the research region.In other words,the geophysical advantageous directions from the gravity and magnetic anomalies are not the same as those caused by the surface structures.The local horizontal gradient results from the gravity and magnetic anomalies show that the majority of earthquakes occur along an intense fault zone,which is a zone of abrupt gravity and negative magnetic change,where the shapes match very well.From the distribution of earthquakes in this area,we find that it has experienced more than 11 earthquake events with magnitude larger than Ms7.0.In addition,water development sites such as Jinshajiang,Lancangjiang,and the Red River and Pearl River watersheds have been hit ten times by earthquakes of this magnitude.It is observed that strong earthquakes occur frequently in the Holocene active fault zone. In this study, we analyzed the gravity and, magnetic characteristics, and the occurrence of a fault zone and discussed the relationships between the two locations. The results reveal that the subsurface structures strikes are different compared with those in the research region. In other words, the geophysical advantageous directions from the gravity and magnetic anomalies are not the same as those caused by the surface structures. The local horizontal gradient results from the gravity and magnetic anomalies show that the majority of earthquakes occur along an intense fault zone, which is a zone of abrupt gravity and negative magnetic change, where the shapes match very well. From the distribution of earthquakes in this area, we find that it has experienced more than 11 earthquake events with magnitude larger than Ms7.0. In addition, water development sites such as Jinshajiang, Lancangjiang, and the Red River and Pearl River watersheds have been hit ten times by earthquakes of this magnitude. It is observed that strong earthquakes occur frequently in the Holocene active fault zone.
作者 Wu Guiju Tan Hongbo Yang Guangliang Shen Chongyang Wu Guiju[1,2];Tan Hongbo[1,2];Yang Guangliang[1,2];Shen Chongyang[1,2];
出处 《大地测量与地球动力学:英文版》 2015年第5期384-391,共8页 Geodesy and Geodynamics
基金 This work is supported by the Chinese Earthquake Administration, Institute of Seismology Foundation (IS201326126) and Chinese earthquake scientific array exploration northern section of North South Seismic Belt gravity profile Foundation (201308011).
关键词 地震发生 地球物理 周边地区 结构特征 中部地区 活动断裂带 云南 水平梯度 Gravity anomaly Magnetic anomaly Multi-scale wavelet analysis Tectonics Earthquake 3D sliding average method Geological feature River system
作者简介 Corresponding author. The Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China.E-mail address: wugjsky@126.com (Wu G.).Wu Guiju Assistant Researcher at Institute of Seismology, China Earthquake Administra- tion. She received B.S. in Computer Science and Mathematics from Yangtze University, Jingzhou in 2004 and M.S. in Geodetection and Information Technology from China University of Geosciences in 2008. As a visiting scholar, she studied in Virginia Polytechnic Institute and State University from Oct. 2010 to Apr. 2011. She obtained Ph.D. in Geodetection and InformationTechnology from China University of Geosciences in 2012. Her research interests focus on gravimetry and analysis of gravity temporal change/signal, forward and inversion of electromagnetism and gravity, and gravity, magnetic and electrical data processing and their interpretation.
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