辽宁地区地壳垂直形变特征与地震危险性分析  

Characteristics of crust vertical deformation and seismic risk analysis in Liaoning area

作　　者：孙启凯[1] 池国民 畅柳[1] 苏广利[1] 田晓[1] 

机构地区：[1]中国地震局第一监测中心,中国天津300180 [2]山东省地震局,中国济南250102

出　　处：《地震学报》2017年第6期891-898,共8页Acta Seismologica Sinica

基　　金：中国地震局地震监测;预测;科研三结合课题(CEA-JC/3JH-163702);科技部基础性工作专项(2015FY210400);地震行业专项(201508009)共同资助

摘　　要：利用辽宁地区三期复测水准资料,计算得出1988—1998年和1998—2016年两个时段的地壳垂直形变速率,并绘制相应的地壳垂直形变速率矢量图和等值线图.结合辽宁地区的区域地质背景及构造断裂活动性,分析了区域地壳垂直形变特征与地震活动性之间的相关性,明确了该区域的整体地壳垂直形变趋势及需重点关注的区域.结果表明:海城MS7.3地震后较长时间内,辽宁地区整体以继承性运动为主,辽东隆起和辽西隆起以上升为主,下辽河断陷带下沉;1998年后,辽宁地区整体形变差异量减小,该地区垂直形变正趋于稳态,垂直形变速率梯度高值区仍集中于下辽河断陷带与辽东隆起、辽西隆起的交界地带,因此该区域的潜在危险性较高,需要持续并重点关注.Based on the three-issue repeated measurement data of the Liaoning area,we calculate the vertical strain rate during 1988--1998 and 1998--2016,and draw the corresponding vector graph and isoline map of the vertical deformation rate.The correlation between vertical deformation characteristics and seismic activities is analyzed combining the geological background and tectonic activity in Liaoning area,thus to identify the overall trend of deformation and to require critical attention to the areas.The results showed that Liaoning region represents as inheritance movement,Liaodong and Liaoxi uplifts exhibit an upward trend,Liaohe down-faulted zone showed subsidence for a long time after MS7.3 Haicheng earthquake;the overall amount of difference of deformation in Liaoning area decreased since 1998,the region＇s vertical deformation tends to be stable.The high gradient zone of deformation rate is still concentrated in the border of Liaohe down-faulted zone,Liaodong and Liaoxi area,and then these areas exist high potential risk and need sustained and focused attention.

关 键 词：垂直形变 构造活动性 梯度 地震活动 

分 类 号：P315.725[天文地球—地震学]