海南陵水近海M_L5.3地震前后琼东南地区地震活动特征  

The Characteristics of Earthquake Activity in Southeast of Hainan before and after Lingshui Offshore M_L 5.3

作　　者：郭昱琴 李盛[1] 

机构地区：[1]海南省地震局,海南海口570100

出　　处：《四川地震》2016年第4期31-34,共4页Earthquake Research in Sichuan

基　　金：海南省地震局科研课题(编号:HDJK201503)

摘　　要：琼东南地区是海南岛及邻区地震较为活跃的地区,1999年5月17日海南陵水近海发生M_S5.0级地震,该地震是华南地区也是东南沿海地区距今最近的一次M_S5.0级以上地震(资料截至2015年底)。本文通过地震活动M-T图、震中分布、震级-频度关系、地震类型以及地震活动性参数等分析方法,分析总结了海南陵水近海M_S5.0(M_L5.3)级地震前后琼东南地区的地震活动特征。认为,琼东南地区M_L2.0以上地震活动具有明显的平静-活跃交替变化的特征;从地震空间分析,地震集中分布在三个区域,显示出丛集活动特征;从构造上分析,地震主要分布于陵水—九所断裂、尖峰—吊罗断裂和琼东南盆地北侧断裂三组断裂附近;从时间进程分析,2009年以来,琼东南地区进入M_L2.0以上地震相对平静期,持续至2015年底。The southeast of Hainan Island and adjacent areas is a seismic active area. On 17 May 1999 an MS5 . 0 Earthquake occurred in Lingshui offshore in southern China’s southeast coastal areas. It is a seismic even above MS5. 0 from 1969 to 2005. By the M-T diagram of seismic activity, the distribution of the epicenters, magnitude- frequency relationship, the type of method of ieismic analysis and parameter analysis of seismic activity, we analyze the seismic activity and summarize the seismic characteristics of the Southeast part of Hainan Province. We believes that the seismic activity of above ML2 . 0 in the Southeast part of Hainan Province show a clear alternating changes between active and calm and that the earthquakes distribute in three sub-areas and show a clustering. From the view of geological structure the earthquakes distribute along three main faults,the Linshui-Jiushuo fault, Jianfeng- Diaoluo fault and the northern fault of Southeast Basin of Hainan. For the southeast area of Hainan Province the seismicity of above ML2. 0 is in calm period from 2009 to 2015.

关 键 词：地震丛 地震活跃期 震级-频度关系 

分 类 号：P315.52[天文地球—地震学]