摘要
利用1970年以来积累的仪器记录地震目录资料,基于G—R关系的应变积累释放模型,研究了鄂尔多斯块体周缘的应变积累释放分期特征及其所处的应变状态。结果表明,块体周缘的应变积累释放具有明显的两阶段分期特征,其周缘整体的应变释放和积累的分界线大致在公元2000年左右。块体周缘以及块体北缘、东缘、西缘目前均处于应变积累状态,应变积累时间均超过10年,未来将进入应变释放阶段,应变释放强度最大的为块体北缘、其次是块体的东缘和西缘;释放的应变量分别相当于6.5级和6.0级左右地震强度。南缘仍处于应变积累释放的起伏阶段。
By using earthquake catalog data recorded by instrument since 1970, the dividing stage characteristics of strain accumulating and releasing around Ordos block and stain state in which were studied in the paper on the basis of strain accumulating and releasing model. The result showed that the strain accumulating and releasing had obvious stage characteristics of two pha- ses, and the boundary was about A. D 2000. Now the periphery of Ordos block and its northern margin,eastern margin and western margin are in strain accumulating status, and all the strain accumulating time has been more than 10 years. The strain releasing phase would come. The most intense area of strain releasing would be in the northern margin, and the eastern margin and western margin will be the next-intense areas, where the intensity of releasing strain will be equal to that of about Ms6.5 and Ms6.0 earthquakes. The southern margin would be still in undulating stage of the strain accumulating and releasing.
出处
《西北地震学报》
CSCD
北大核心
2013年第B12期54-60,共7页
Northwestern Seismological Journal
关键词
鄂尔多斯块体
应变积累释放
地震活动
特征
Ordos block
strain accumulating and releasing
seismic activity
characteristic