山东乳山地震序列震源机制解一致性参数特征  

RESEARCH ON CHARACTERISTICS OF THE FOCAL MECHANISM SOLUTIONS CONSISTENCY OF RUSHAN EARTHQUAKE SEQUENCE,SHANDONG PROVINCE

作　　者：刘方斌[1,2] 曲均浩 李亚军[1] 范晓易[1] 苗庆杰 LIU Fang-bin;QU Jun-hao;LI Ya-jun;FAN Xiao-yi;MIAO Qing-jie(Shandong Earthquake Agency,Jinan 250014,China;Key Laboratory of Western China s Environment System,Ministry of Education,Lanzhou University, Lanzhou 730000,China;Institute of Geology,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]山东省地震局,济南250014 [2]兰州大学,西部环境教育部重点实验室,兰州730000 [3]中国地震局地质研究所,北京100029

出　　处：《地震地质》2018年第5期1086-1099,共14页Seismology and Geology

基　　金：中国地震局星火计划项目(XH16025);中国地震局三结合项目(CEA-JC/3JH-171601);山东省地震局科技创新团队基金(SDST-07-2018)联合资助。

摘　　要：采用双差定位法对乳山台阵记录到的M_L≥1.0的1 418个地震事件(2014年5月7日—2016年12月31日)进行重新定位,利用P波初动和CAP方法对研究区内M_L≥1.5地震进行震源机制解反演,根据震源机制解资料进行应力张量反演,从而分析乳山地区应力状态以及震源机制一致性参数时空特征。结果显示:1)乳山地震序列沿NWW-SEE向展布,形成长约4km、宽约3km的矩形活动带;2)推测乳山地震序列发震断层走向为NWW-SEE、近直立、以走滑运动为主兼具一定逆倾滑分量;3)采用自助线性应力反演(LSIB)方法得到乳山地区主压应力轴方向为25°,倾角10°;中等应力方向为286°,倾角45°;主张应力方向为125°,倾角43°;4)乳山地震序列的震源机制一致性参数随时间变化整体呈现平稳状态,地震发生的空间位置与震源参数一致性空间分布关系较为吻合。Many small earthquakes occurred intensively and continuously and formed an earthquake sequence after the M L3.8 earthquake happened at Rushan County,Shandong Province on October 1,2013.Up to March,2017,more than 13000 events have been recorded,with 3429 locatable shocks,of which 31 events with M L≥3.0.This sequence is rarely seen in East China for its extraordinary long duration and the extremely high frequency of aftershocks.To track the developing tendency of the earthquake sequence accurately,20 temporary seismometers were arranged to monitor the sequence activities around the epicenter of the sequence since May 6,2014.Firstly,this paper adopts double difference method to relocate the 1418 earthquakes of M L≥1.0 recorded by temporary seismometers in the Rushan earthquake sequence(May 7,2014 to December 31,2016),the result shows that the Rushan earthquake sequence mainly extends along NWW-SEE and forms a rectangular activity belt of about 4km long and 3km wide.In addition,the seismogenic fault of Rushan earthquake sequence stretches along NWW-SEE with nearly vertical strike-slip movement and a small amount of thrust component.Then we apply the P-wave initial motion and CAP to invert the focal mechanism of earthquakes with M L≥1.5 in the study area.The earthquakes can be divided into several categories,including 3 normal fault earthquakes(0.9%),3 normal-slip earthquakes(0.9%),229 strike-slip earthquakes(65.8%),18 thrust fault earthquakes(5.2%),37 thrust-slip earthquakes(10.6%)and 58 undefined(16.6%).Most earthquakes had a strike-slip mechanism in Rushan(65.8%),which is one of the intrinsic characteristics of the stress field.According to the focal mechanism solutions,we further utilized the LSIB method(Linear stress inversion bootstrap)to invert the stress tensor of Rushan area.The result shows that the azimuth and plunge of three principal stress(σ1,σ2,σ3)axes are 25°,10°;286°,45°;125°,43°,respectively.Based on the stress field inversion results,we calculated the focal mechanism solutions consist

关 键 词：乳山地震序列 双差定位 震源机制解 一致性参数 

分 类 号：P315.727[天文地球—地震学]