汶川地震前后山东及周边地区地壳运动特征分析  

ON CHARACTERISTICS OF CRUSTAL MOVEMENT OF SHANDONG AND SURROUNDING AREAS BEFORE AND AFTER WENCHUAN M s8.0 EARTHQUAKE

作　　者：殷海涛[1] 李杰[1] 董晓娜[1] 许萍[1] 

机构地区：[1]山东省地震局,济南250014

出　　处：《大地测量与地球动力学》2009年第3期23-27,33,共6页Journal of Geodesy and Geodynamics

基　　金："十五"山东省防震减灾重点项目(SD501-04);奥运安保项目(2008GG10008004)

摘　　要：为了研究汶川8.0级大地震前后山东内部及其与周边地区的地壳运动变化状态,采用滑动傅里叶周期估计法对泰安(TAIN)基准站和周边处于不同块体的6个GPS基准站间的基线变化情况进行分析,结果发现:汶川地震前基线TAIN-X IAN和TAIN-WUHN均出现了较明显的破年变情况;汶川地震后山东地区整体向东移动速率有所减小,分析认为此现象为块体所受东向推动力减弱所致,汶川地震对山东及周边地区近期震情起到了一定的缓解作用。In order to study the crustal movement of Shandong and surrounding areas before and after Wenchuan Ms8.0 earthquake, we analyzed the baselines between Taian （TAIN） and several fiducial stations in different blocks by using SDFF Period Estimate method. The preliminary results showed that there were obvious exceptional annual variations of baseline TAIN-XIAN and TAIN-WUHN before Wenchuan earthquake. The eastward movement velocity of GPS fiducial stations in Shandong and surrounding area was decreasing after the earthquake, we conclude that the eastward driving force on the North China block weakened, It shows that the Wenchuan earthquake alleviated the Shandong and surrounding areas＇ recent earthquake situation.

关 键 词：GPS 汶川地震 地壳运动 滑动傅里叶法 速度场 

分 类 号：P315.725[天文地球—地震学]