内蒙古通辽5.3级地震序列特征及发震背景分析  

Analysis of Sequence Characteristics and Occurrence Background of the Tongliao M5.3 Earthquake

作　　者：裴惠娟[1] 韩晓明[2] 张帆[2] 胡博[2] 陈文凯[3] 

机构地区：[1]中国科学院兰州文献情报中心,甘肃兰州730000 [2]内蒙古自治区地震局,内蒙古呼和浩特010010 [3]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《地震工程学报》2015年第1期242-247,共6页China Earthquake Engineering Journal

基　　金：中国地震局兰州地震研究所地震科技发展基金项目(2013M01);地震科技星火计划项目(XH15010Y);2012年内蒙古自治区科技厅应用技术研究与开发项目

摘　　要：2013年4月22日在赤峰—开原断裂中段发生了内蒙古通辽5.3级地震,对我国华北和东北地区的地震形势产生双重影响。基于K值、G-R关系、能量释放比例RE和M-T等指标判定通辽5.3级地震为主震-余震型。根据1900年以来东北地区中强地震时空演化规律分析认为,大兴安岭和松辽盆地5级以上地震具有基于时间相依的空间对跳现象,通辽5.3地震是继2008年6月10日阿荣旗与鄂伦春交界5.2级地震之后,对跳发生于松辽盆地东南边缘的一次中强地震;对比东北地区以往震例分析认为,通辽5.3级地震既具有符合历史统计规律的普遍性,又具有不同于历史统计规律的特殊性。根据2011年3月11日日本东海岸9.0级强震前后东北地区中等以上地震的时空演化特征分析认为,海拉尔盆地及大兴安岭过渡带、环渤海地区至开鲁盆地的"菱形"区域是日本9.0级地震之后我国东部地区响应最为强烈的地区。由于同时受到日本9.0级地震和鄂霍次克海8.2级深震前所未有的双重影响,2013年东北地区的松辽盆地史无前例的发生了8次5级以上中强地震,未来东北地区很可能将重启新的地震活动格局。It is generally known that the Chifeng-Kaiyuan fault functions as the boundary between the North China Block and Northeast Block.On April 22,2013,the Tongliao M5.3earthquake occurred in the central segment of the Chifeng-Kaiyuan fault,and thus,it exerted dual influence on the occurrence background in North and Northeast China.This earthquake was determined to be of mainshock-aftershock type based on the results of indicators such as the Kvalue,G-Rrelationship,energy release rate RE,and M-T.An analysis of the space-time evolution regularities of moderately strong earthquakes in Northeast China since 1900,presented in this paper,shows that earthquakesM5.0in Greater Khingan and the Songliao Basin are time-dependent and space-alternating events.Following the ArunOroqen border M5.3earthquake of 2008,the Tongliao M5.3earthquake occurred in the southeastern edge of the Songliao Basin as a moderately strong earthquake.Further comparative studies with past earthquakes in Northeast China have shown that this earthquake has both generality and particularity.The space-time evolution regularities of moderate and strong earthquakes in Northeast China,both before and after the 2011 Japan M9.0magnitude earthquake,indicates that compared with other areas of Northeast China,the diamond-shaped area between the Hailaer Basin,Greater Hinggan transition zone,circum-Bohai region,and the Kailu Basin responded most strongly to the2011 Japan M9.0earthquake.Influenced by the Okhotsk M8.2and Japan M9.0earthquakes,more than eight M5.0earthquakes occurred in the Songliao Basin in 2013.This article concludes that a new pattern of seismic activity is likely to start in Northeast China in the future.

关 键 词：赤峰—开原断裂 通辽5.3级地震 序列特征 地震定位 地震形势 

分 类 号：P315.63[天文地球—地震学]