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Spatial variations of b-values in the coastal area of Guangdong
Zhou, PX; Xia, SH; Sun, JL; Cao, JH; Xu, HL; Zhao, F; Chen, CX; shxia@scsio.ac.cn
2018
发表期刊JOURNAL OF OCEAN UNIVERSITY OF CHINA
卷号17期号:1页码:177-185
摘要We used earthquake catalogs recorded by Guangdong Seismological Network from 2008 to 2014 to resolve the spatial variations of b-values in the coastal area of Guangdong, particularly in three key research areas (Yangjiang, Heyuan, and offshore Nanao Island) with strong seismicity. Our results revealed that b-values exhibited significant spatial variations, and zones with low b-values could indicate the most likely seismogenic area of large earthquakes. We observed three clear low b-value patches in the offshore Nanao Island. We found a distinct high b-value peak at the depth of 11 km and two minimum peaks at about 14 and 7-8 km in the Yangjiang area. The overall b-values generally decrease with depth in the Heyuan area. The spatial variations of b-values reflect tectonic anomalies; that is, the 'low-high-low' distribution of b-values in the offshore Nanao Island and the Yangjiang area may indicate the anomaly of the crustal structure with a weak layer. The b-values of reservoir-induced seismicity are obviously lower than that induced by tectonism. This finding indicates that the reservoir area is generally at high stress state under the condition of high pore pressure. We inferred that large earthquakes might be prone to occur at 10-12 km depth in the offshore Nanao Island, at 12-15 km depth in the Yangjiang area, and at the lower part of the seismic activity zone in the Heyuan area. Moreover, the upstream area of the Xinfengjiang reservoir is the most likely area of future large earthquakes in the Heyuan area.
部门归属[Zhou, Pengxiang; Xia, Shaohong; Sun, Jinlong; Cao, Jinghe; Xu, Huilong; Zhao, Fang] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Zhou, Pengxiang] Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China; [Chen, Chuanxu] Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
学科领域Oceanography
关键词[WOS]b-values ; earthquake ; Guangdong ; seismogenic area ; stress
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17159
专题中科院边缘海地质重点实验室
通讯作者shxia@scsio.ac.cn
推荐引用方式
GB/T 7714
Zhou, PX,Xia, SH,Sun, JL,et al. Spatial variations of b-values in the coastal area of Guangdong[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2018,17(1):177-185.
APA Zhou, PX.,Xia, SH.,Sun, JL.,Cao, JH.,Xu, HL.,...&shxia@scsio.ac.cn.(2018).Spatial variations of b-values in the coastal area of Guangdong.JOURNAL OF OCEAN UNIVERSITY OF CHINA,17(1),177-185.
MLA Zhou, PX,et al."Spatial variations of b-values in the coastal area of Guangdong".JOURNAL OF OCEAN UNIVERSITY OF CHINA 17.1(2018):177-185.
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