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《Seismology and Geology》 2013-04
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DISCUSSION ON THE CHARACTERISTICS AND SEISMO-TECTONICS OF THE GAIZHOU M_L4. 7EARTHQUAKE SWARM SEQUENCE ON FEBRUARY 2,2012

CAO Feng-juan;WANG Liang;JIAO Ming-ruo;ZHAI Li-na;WANG Yan;Earthquake Administration of Liaoning Province;  
During the Gaizhou M L4. 7 earthquake swarm sequence on February 2,2012,the energy release weakened gradually with time,accompanied with two obviously accelerated release processes. The double-difference location results show that the spatial distribution of Gaizhou earthquake swarm is mainly concentrated in the area between the Jinzhou Fault and the Yingkou-Haicheng Fault,spreading roughly in NW direction. The sequence showed a trend of migrating from Jinzhou Fault to YingkouHaicheng Fault,and the focal depths are distributed from 6km to 9km.The P-axis directions of focal mechanism of the two M L 4 earthquakes occurring on February 2 are distributed from 94 to 120 degrees,which coincide with the previous studies on the regional tectonic stress field. We could infer that Gaizhou M L 4. 7 earthquake sequence on February 2 was caused by the strike-slip faulting of Jinzhou Fault under the action of NWW or near-EW regional stress field. But the P-axis direction of the two M L 4 earthquakes occurring on July 12 and November 1 turned to near NS,and according to the precise relocations,these two earthquakes had the trend of migrating to Yingkou-Haicheng Fault. It is inferred,therefore,that the two obvious stress releases are not only the result of slip of Jinzhou Fault,the Yingkou-Haicheng Fault also played a certain role. Combining with acoustic emission results,it can be further found that seismogenic structure of the M L 4. 7 earthquake swarm in Gaizhou is the two en echelon faults,the NE-trending Jinzhou Fault and the Yingkou-Haicheng Fault. This earthquake swarm could be caused by joint action of the two faults. Meanwhile,it also indicates that there are signs of activity of both Jinzhou and Yingkou-Haicheng Faults under the action of the regional stress field.
【Fund】: 国家自然科学基金(51004025)资助
【CateGory Index】: P315.5
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