鄂尔多斯地块北缘动力背景和现今地震活动特征  

Dynamic Background and Present Seismic Activity Characteristics in the Northern Margin of the Ordos Block

作　　者：高立新[1] 戴勇[1] 陈立峰[1] 李拴虎[1] 杨红樱[1] 梁沙沙[1] 

机构地区：[1]内蒙古自治区地震局,呼和浩特市哲里木路80号010010

出　　处：《大地测量与地球动力学》2017年第7期668-674,共7页Journal of Geodesy and Geodynamics

基　　金：内蒙古自治区科技厅2016年科技重大专项~~

摘　　要：鄂尔多斯地块的动力背景是青藏高原东北缘NE向推挤作用的结果。1970年以来,鄂尔多斯地块北缘现今地震活动表明,中强地震活动具有幕式活动特征,从1970~2015年共经历了4幕活动;块体西北缘与东北缘的中强地震具有迁移对跳活动特征,1970年以来共经历了4组对跳;震例统计结果揭示,地块北缘6.0级左右地震前,块体中等地震经历长时间平静具有普适特征;2005-03以来,块体所在的阴山地震带再次进入中等地震超长平静时段。其幕式活动特征、迁移特征、时间平静特征可作为区域范围强震的预测指标。The research results show that dynamic background of the Ordos block is the Tibetan plat- eau compression from an East-West direction. The seismic activity of the Ordos block northern margin since 1970 shows that the moderate seismicity is characterized by episodic activities; moderate earth- quakes of Ordos block experienced 4 curtains from 1970 to 2015, strong earthquakes of the northwest- ern and northeastern margins of the Ordos block has migrating characteristics, a total of 4 curtains since 1970, （before the magnitude 6 earthquake in the northern margin of the block）. The moderate earthquake of the entire block has been quiet a long time according to the statistical results of earth- quake examples, while moderate seismic is in a long quiet stage in Yinshan seismic zone since March 2005. The curtain activity and migrating characteristics, as well as the time calm characteristics, can be used as a prediction index for strong earthquakes in the region.

关 键 词：鄂尔多斯地块 动力背景 地震活动 特征 

分 类 号：P315[天文地球—地震学]