南海北部陆缘地震带的活动性与发震机制

doi:10.11978/j.issn.1009-5470.2012.03.006

Abstract

Abstract: The continental margin seismic belt (CMSB) of northern South China Sea (SCS) is an active intraplate seismic zone. Research on the CMSB has significant importance in earthquake prevention and disaster reduction, and in understanding the neotectoics of the northern SCS. By seismicity analyzing, we suggest that the CMSB can be divided into seismically active zones of Southern Fujian-Eastern Guangdong, Yangjiang, and Leizhou-Hainan, and less active zone of the Pearl River area. The E-SEE-wards moving of South China (SC) block induced by the extrusion of Indo-Tibet collision, and the NW-wards moving Philippine Sea (PHS) Plate constituent the major tectonic setting of seismicity in the CMSB. Collision of SC and PHS, as well as shearing-compression along the west and south boundaries of SC block, generated great strain energy. This energy was conveyed and balanced with the Literal Faults zone (LFZ) and low velocity layer in curst as conduits. In those areas affected strongly by shearing-compression in both west and east parts of the CMSB, seismicity concentrated at the intersection of NW- and NE-trending local faults, and great earthquakes occurred at the intersection of NW-trending faults and LFZ. The Pearl River mouth area, however, suffered less shearing-compression, and had only scattered earthquakes of mid-low magnitude and no earthquake with M≥6.0 documented.

Key words: seismic belt, Literal Faults zone, continental margin of northern South China Sea, triggering mechanism

CLC Number:

P738.4

SUN Jin-long, XU Hui-long, ZHAN Wen-huan, CAO Jing-he. Activity and triggering mechanism of seismic belt along the northern South China Sea continental margin[J].Journal of Tropical Oceanography, 2012, 31(3): 40-47.

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Activity and triggering mechanism of seismic belt along the northern South China Sea continental margin

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