利用重复地震研究盖州震群地区介质变化
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摘要
盖州震群自2012年2月2日开始活动,截至2016年12月已活动了近5年的时间,其中持续活动的青石岭序列精定位后的空间展布在5km以内,深度也较为集中,可作为重复地震进行研究。通过计算盖州地区2012年2月—2016年12月M_L≥2.0重复地震序列经射线追踪法校正后的P波走时差,得到了盖州震群区域至岫岩台、辽阳台、高升台、瓦房店台四象限的介质变化情况,结果介质短期的变化受震群本身显著事件活动影响较为明显。中强地震前后周边地区介质变化显著。
By the time of December 2016 Gaizhou earthquake swarm activities has been lasted for nearly 5 years. The spatial distribution of the Qingshiling sequence of the continuous activity is within 5 km. The depth is also more concentrated and can be used as the study of recurrent earthquakes. Through the calculation of Gaizhou area M_L≥ 2.0 recurrent seismic sequence from February, 2012 to December, 2016 by ray tracing method after correction of P wave travel time difference, the four quadrant medium changes from Gaizhou earthquake swarm to Xiuyan Seismic Station, Liaoyang Seismic Station, Wafangdian Seismic Station. The results showed that the short-term change of media is obviously influenced by the events of the earthquake swarm itself. Before and after medium strong earthquake, the surrounding area has significant changed.
By the time of December 2016 Gaizhou earthquake swarm activities has been lasted for nearly 5 years. The spatial distribution of the Qingshiling sequence of the continuous activity is within 5 km. The depth is also more concentrated and can be used as the study of recurrent earthquakes. Through the calculation of Gaizhou area M_L≥ 2.0 recurrent seismic sequence from February, 2012 to December, 2016 by ray tracing method after correction of P wave travel time difference, the four quadrant medium changes from Gaizhou earthquake swarm to Xiuyan Seismic Station, Liaoyang Seismic Station, Wafangdian Seismic Station. The results showed that the short-term change of media is obviously influenced by the events of the earthquake swarm itself. Before and after medium strong earthquake, the surrounding area has significant changed.
引文
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[2]周龙泉,刘桂萍,马宏生,等.利用重复地震观测地壳介质变化[J].地震,2007,27(3):l-9.
[3]叶秀薇,闻则刚,刘锦,等.利用重复地震研究广东阳江地区介质变化[J].地震,2008,28(4):103-111.
[4]李志伟,胥颐,郝天珧,等.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,2006,49(3):797-804.