新疆于田两次7.3级地震之后南北地震带Benioff应变比分布特征研究  

Research on the distribution features of the Benioff strain ratio in the North South Seismic Belt after the two Yutian M_S7. 3 earthquakes

作　　者：杨文[1] 周龙泉[1] 刘杰[1] 程佳[1,2] 

机构地区：[1]中国地震台网中心 [2]中国地震局地质研究所活动构造与火山重点实验室,北京100029

出　　处：《中国地震》2014年第2期219-225,共7页Earthquake Research in China

基　　金："十二.五"国家科技支撑计划项目(2012BAK19B02-01)资助

摘　　要：利用中国地震台网的地震目录,分别计算新疆于田2008年3月21日7.3级、2014年2月12日7.3级地震前后30天南北地震带Benioff应变比。结果表明,2008年7.3级地震后1年内,后续5级以上地震均发生在Benioff应变比高值区域附近或者高、低值交界区域,强震活动与Benioff应变比的高值区域存在明显对应关系。这反映了相应区域应力水平可能较高,于田地震的发生导致这些应力高值区容易释放小地震,研究结果对该区域后续强震的发生有一定指示意义。After the 2014 Yutian MS7.3 earthquake,as the impact of the relation with tectonic and seismic activity,the earthquake risk in the North South Seismic Belt is a matter of concern.Using the catalog provided by China Earthquake Networks Center,the Benioff strain ratio is calculated in the North South Seismic Belt 30 days before and after the March 21,2008 and February 12,2014 Yutian MS7.3 earthquakes.The results show that the main shocks with M ＞5.0 within one year all occurred in the area near the high strain ratio or the junction area of the high and low strain ratio after the 2008 Yutian MS 7.3 earthquake.The activity of strong earthquake coincides with the high strain ratio obviously.This reflects the high stress level in the regions.The area with high stress easily releases some small earthquakes after the Yutian earthquake and the research has certain significance for the strong earthquake.

关 键 词：两次于田地震 Benioff应变比 地震活动性 南北地震带 

分 类 号：P315[天文地球—地震学]