GPS约束的汶川地震后川滇区域地壳形变研究  

Crustal deformation in Sichuan-Yunnan region after Wenchuan earthquake with GPS constraint

作　　者：岳彩亚 杨强[3] 刘慧娟[4] YUE Caiya;YANG Qiang;LIU Huijuan(School of Geography and the Environment,Liaocheng University,Liaocheng,Shandong 282000,China;Beijing Key Laboratory of Urban Spatial Information Engineering,Beijing 100045,China;Chinese Academy of Surveying&Mapping,Beijing 100036,China;Sichuan No.1 Surveying and Mapping Engineering Institute,Chengdu 610100,China)

机构地区：[1]聊城大学地理与环境学院,山东聊城282000 [2]城市空间信息工程北京市重点实验室,北京100045 [3]中国测绘科学研究院,北京100036 [4]四川省第一测绘工程院,成都610100

出　　处：《测绘科学》2022年第9期52-59,共8页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41974010);聊城大学博士科研启动基金项目(318052115);城市空间信息工程北京市重点实验室经费资助项目(20220120)

摘　　要：为了研究汶川地震后川滇地区地壳形变的时空分布带来的影响,该文以GPS速度场为约束,通过构建平移-旋转-应变模型计算得到区域内2008-06—2010-04、2010-05—2013-04和2013-05—2016-06这3期应变率场,并结合断裂带分布对不同期地壳应变场进行对比分析。结果表明:川滇地区地壳水平运动整体以继承性运动为主,强震的发生并未改变区域内整体运动趋势与作用力方向,且应变率场和面膨胀率的高值区域主要分布在断裂带间的交叉点或周边,变化较大区域主要位于几条深大断裂带及周边。汶川地震后区域内速度场随时间变化更加复杂且量级有所增加,且该地震对整个川滇地区地壳活动具有重要影响,而玉树地震和雅安地震主要对北半部分地壳起到一定调节作用,雅安地震后该区域应变累计增强,周边仍然有发生强震的危险性。In order to study the temporal and spatial distribution of crustal deformation in Sichuan-Yunnan region(SYR)after Wenchuan earthquake,strain rate fields in three periods(2008-06—2010-04,2010-05—2013-04 and 2013-05—2016-12)after Wenchuan earthquake were calculated by constructing a translation-rotation-strain model.The results showed that the crustal horizontal movement in Sichuan-Yunnan region was mainly inherited,and the strong earthquake didn’t change the trend of the whole movement and the direction of the force.The strain rate field and surface expansion rate showed that the high value area was mainly distributed at or around the intersection between fault zones and its surroundings,and the maximum area was mainly located at some long and deep fault zones.After the Wenchuan earthquake,the velocity field in the region became more complex and the magnitude increased with time,and this earthquake had an important influence on the crustal activity of the whole Sichuan-Yunnan region,while the Yushu earthquake and the Ya’an earthquake mainly affect the northern part of the crust,and after the Ya’an earthquake,the strain accumulated in the region increased,and there was still a high risk of strong earthquakes.

关 键 词：川滇区域 平移-旋转-应变-模型 断裂带 应变场 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P315.7[天文地球—测绘科学与技术]