基于双差定位法的鄂尔多斯块体西北缘地震精定位研究  

Precise Seismic Location of the Northwest Margin of Ordos Block Based on Double Difference Location Method

作　　者：郭伟 刘甜甜 范玲玲 李贵明 GUO Wei;LIU Tian-tian;FAN Ling-ling;LI Gui-ming(Wujiahe Seismic Station,Seismological Bureau of Inner Mongolia Autonomous Region,Bayannaoer,Inner Mongolia 015331,China;Institute of earthquake prediction,Seismological Bureau of China,Beijing 100036,China)

机构地区：[1]内蒙古自治区地震局乌加河地震台,内蒙古巴彦淖尔015331 [2]中国地震局地震预测研究所,北京100036

出　　处：《山西地震》2021年第1期10-14,19,共6页Earthquake Research in Shanxi

基　　金：内蒙古自治区地震局局长基金课题(2019JC15)。

摘　　要：针对鄂尔多斯块体西北缘地震活动的复杂性及目前台网定位方法存在偏差的问题,采用双差定位法对2009—2019年发生在鄂尔多斯块体西北缘的地震事件进行重新定位。经研究表明,双差定位之后地震分布更集中,鄂尔多斯块体西缘的地震沿银川吉兰泰断陷带分布,北缘的地震沿河套断陷带分布,地震定位精度明显提高,这与块体周缘复杂的地质构造背景和动力学过程密切相关。定位结果可为进一步研究该区域的地震活动性等提供参考。In view of the complexity of seismic activity in the northwest margin of Ordos block and the deviation of current network positioning method,the double difference location method is used to relocate the seismic events occurred in the northwest margin of Ordos block from 2009 to 2019.The study shows that the distribution of earthquakes is more concentrated after double difference location.The earthquakes in the western margin of Ordos block are distributed along the Yinchuan Jilantai fault depression belt,and the earthquakes in the northern margin are distributed along the Hetao fault depression belt.The accuracy of seismic location is significantly improved,which is closely related to the complex geological structure background and dynamic process around the block.The location results lay a foundation for further study of seismicity in this area.

关 键 词：双差定位法 鄂尔多斯块体 银川吉兰泰断陷带 河套断陷带 

分 类 号：P315.73[天文地球—地震学]