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《Chinese Journal of Geophysics》 2018-03
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Relative motion between the two blocks on either side of the Yishu fault zone after the 2011 Japan M_W9.0 earthquake and its effect on seismic activity

ZHU ChengLin;GAN WeiJun;LI Jie;JIA Yuan;WANG Qiang;YIN HaiTao;State Key Laboratory of Earthquake Dynamics,Institute of Geology,CEA;Shandong Earthquake Agency;  
Associated with the subduction of the Pacific plate,the Japan MW9.0 earthquake occurred on 11 March 2011,and caused millimeter to centimeter coseismic horizontal displacement in Northeast China and North China.The Yishu fault zone(the Shandong segment of the TanchengLujiang fault zone),a deep feature in eastern China,tectonically related with the Japan Trench system,also affected by the subduction of the Pacific plate,receives attention after this great shock.Previous work shows that the differential motion and interaction between active blocks play a direct effect on their seismic activity.As the boundary of the North China block andLudong-Huanghai block,it has been a concerned issue that the transmitting of tectonic stress between two blocks on either side of the Yishu fault zone after the Japan MW9.0 earthquake.This work is based on the continuous GPS observations on the two sides of the Yishu fault zone and a model of sliding blocks.The purpose is to study the relative motion between the two blocks aforementioned and its evolution process and its relation with the regional seismic activity.1)Since the Japan MW9.0 earthquake,the two blocks exhibits a relative right-lateral strikeslip and compression state which accords with Yishu fault zone′s dextral strike-slip and thrust under the NEE-directed regional principal compressional stress field,with mean rates was 0.9±0.1 mm·a-1 and-0.7±0.1 mm·a-1,respectively.Compared to the state before the earthquake,the process after the earthquake showed more characteristic in up and down motion ranging 0.5~2.5 mm·a-1,which was likely related to the change of the relative motion between the two plates on either side of the subduction zone before and after the Japan MW9.0 earthquake.2)There was a better correlation between seismic activity and relative motion of the two blocks when earthquakes were selected in a retrieval circle,of which the center was the midpoint of the Yishu fault zone with a radius of 250~500 km.The best correlation coefficients between seismic activity parameter frequency N,total releasing energy equivalent magnitude M,seismicity S value,seismicity b value and the two blocks′relative motion are 0.66,0.69,0.74,and-0.6,respectively,which were significant by T-test.The two blocks′relative motion direction when the earthquake energy released centrally was consistent with the principal compressive stress direction of the study area and the rate of the relative motion had a synchronism character with the seismic activity intensity.It indicates that the two blocks′relative motion had some controlling effect on the main seismic activity situation of the Yishu fault zone and its two sides after the Japan MW9.0 earthquake.3)As typical cases,the analysis of the mechanism of the Laizhou earthquake sequence and Rushan earthquake swarm shows that they may be both caused by the tectonic stress adjustment of their local areas which were probably promoted by the two blocks′relative motion.The research results above are of significance to understand the crustal motion state of the Yishu fault zone and the blocks on its two sides,and the dynamic mechanism of the seismic activity situation of the study area.
【Fund】: 中国地震局地震科技星火计划项目(XH17019);中国地震局地震行业科研专项(201508009);中国地震局震情跟踪定向工作任务(2016010201)联合资助;; 山东省地震局科研基金项目(JJ1605Y)
【CateGory Index】: P315
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