东海震群及其邻近区域震情讨论  

ANALYSIS ON SEISMIC TENDENCY OF EARTHQUAKE SWARM IN THE DONGHAI SEA AND ITS NEIGHBORING REGION IN CHINA

作　　者：殷翔[1] 王维[1] 杨云[1] 

机构地区：[1]江苏省地震局,江苏南京210014

出　　处：《高原地震》2015年第3期29-34,62,共7页Plateau Earthquake Research

摘　　要：郯庐断裂带山东至江苏段在多年ML3级以上地震平静背景下,2015年以来相继发生多次显著地震,并发生了东海震群,显示区域地震活动性显著增强。区域背景应力场反演结果显示P轴方位呈现近东西向分布,东海震群主震及部分余震震源机制结果和背景应力场并不一致;且东海震群的震源机制解,无论是断层面走向,还是主应力轴的取向都相对紊乱。精定位结果显示,东海震群呈北西走向展布;震群在深度分布上有2个明显不同的阶段,由深向浅发展特征明显。区域地震显著增强与跨断层流动水准资料显示的形变压性有很好的一致性。In the quiet background of earthquakes with ML≤3. 0 in Shandong-Jiangsu segment along Danlu fault zone,a several earthquakes and the Donghai Sea earthquake swarm occurred since 2015,and this showed that regional seismicity was strengthened. The results of regional bckground stress field inversion show that the direction of P-axis is east-west distribution,and the focal mechanism of the Donghai Sea earthquake swarm and the their aftershocks are inconsistent with the background stress field; the direction of the focal mechanism solutionof the swarm is disorder in the fault and the main stress axis. The results of the precision positioning show that the epicenters of the Donghai Sea swarm are north-west direction distribution; the swarm in depth distribution has two distinct phases,the characteristics from deep to shallow development are obviously. Regional earqhuake significantly enhanced and flow level across the fault data is consistent with the deformation pressure.

关 键 词：东海震群 震源机制 精定位 

分 类 号：P315.75[天文地球—地震学]