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Zhang Xiankang,Zhao Jinren,Liu Guohu,Song Wenrong,Liu Baojin,Zhao Chengbin,Cheng Shuangxi,Liu Jianda,Gu Menglin,Sun Zhenguo
Author NameAffiliation
Zhang Xiankang Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
Zhao Jinren Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
Liu Guohu Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
Song Wenrong Seismological Bureau of Jiangsu Province, Nanjing 210014, China 
Liu Baojin Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
Zhao Chengbin Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
Cheng Shuangxi Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
Liu Jianda Seismological Bureau of Jiangsu Province, Nanjing 210014, China 
Gu Menglin Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
Sun Zhenguo Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China 
摘要:
关键词:  强震区 深层映射压型 结构研究 地震源
DOI:
分类号:
基金项目:9th Five-Year Plan period(200141)%Research Center of Exploration Geophysics, CSB
Study on Fine Crustal Structure of the Sanhe-Pinggu Earthquake (M8.0) Region by Deep Seismic Reflection Profiling
Zhang Xiankang,Zhao Jinren,Liu Guohu,Song Wenrong,Liu Baojin,Zhao Chengbin,Cheng Shuangxi,Liu Jianda,Gu Menglin,Sun Zhenguo
Abstract:
Two near-vertical deep seismic reflection profiles (140km-long, 24-fold) were completed in the 1679 Sanhe-Pinggu earthquake (M8.0) region. The profiles ran through the Xiadian fault and the Ershilichangshan fault. The profiling result shows that the crust in this region is divided into the upper crust, the lower crust and the crust-mantle transitional zone by two powerful laminated reflectors: one at the two-way travel-time of about 7.0s (21km), the other at about 11.0~12.5s (33~37km). Crustal structure varies significantly in vertical direction. The shallow part is characterized by obvious stratification, multilayers and complexity. The upper crust on the whole features reflection “transparency”, while the lower crust features distinct reflectivity. Crustal structure also varies a lot in the lateral direction. The main fracture in this region is the deep fault under the Xiadian fault. This deep fault is steeply inclined (nearly vertical), and is supposed to be the causative fault of the Sanhe-Pinggu M8.0 earthquake. The two profiles respectively reveal the existence of local strong reflectivity in the lower crust and the lower part of the upper crust, which is assumed to be a dike or rock mass formed by the upwelling and cooling down of materials from the upper mantle. Magmatic activity in this part brought about differences in regional stress distribution, which then gave rise to the formation of the deep fault. That is supposed to be the deep structural setting for the Sanhe-Pinggu M8.0 earthquake.
Key words:  The Sanhe-Pinggu meizoseismal region  Deep reflection profiling  Fine structure study of earthquake source