铺前-清澜断裂带附近地震的重定位及其构造意义的初步分析  

Relocation of Earthquakes near the Puqian-Qinglan Fault and Preliminary Analysis of Tectonic Significance

作　　者：徐晓枫[1] 王惠琳[1] 胡久常[1] 孙佩雯[1] 

机构地区：[1]海南省地震局,海口570203

出　　处：《华南地震》2017年第2期10-16,共7页South China Journal of Seismology

基　　金：海南省地震局青年基金项目(201401)资助

摘　　要：铺前-清澜断裂是海南岛最活跃的发震构造之一,该断裂构成了1605年7^(1/2)级地震的发震构造。海南省数字化地震台网运行至今,记录到该断裂附近小震活动较为活跃,小震分布呈南北向排列并且与断裂带南部对应的不一致。基于海南省数字化地震台网2000年1月至2014年12月数据,使用双差定位方法对该断裂带附近的128个地震进行重新定位,最终得到118个地震的震源时空参数。对新的定位结果进行数据拟合,得出地震分布走向是NW2°。地震分布走向和铺前-清澜断裂在南端对应仍不是很好,可能是由于铺前-清澜断裂北段活动时代为全新世,而南段的活动时代为早中更新世,南段活动性已经向西部空间迁移,推断和地下岩浆囊的变化有关。Puqian-Qinglan fault is one of the most active seismotectonic faults of Hainan island. The fault constituted the seismotectonic fault of M 71/2 earthquake in 1605. Small earthquakes near the fault are still more active, and earthquakes are basically arranged in north -south direction, Puqian -Qinglan which doesn＇t correspond completely consistent with the southern part of Puqian-Qinglan fault. Based on the data recorded by digital seismic network of Hainan province during January 2000 and December 2014, the paper relocated the128 small earthquakes by using the double-difference earthquake location method, and got 118 new parameters of the earthquake source, and the resuls show that the trend of earthquake distribution is NW2. The corresponding is not particularly well between fitting fault and Puqian-Qinglan fault, which maybe due to the fact that the active age of the northern section of Puqian-Qinglan fault is Holocene, the active age of the southern section of Puqian-Qinglan fault is early middle Pleistocene, southern earthquake activity moving toward west, inferring that the change related to the magma capsule.

关 键 词：双差精定位 铺前-清澜断裂带 地震构造 地震活动 震源深度 

分 类 号：P542.3[天文地球—构造地质学]