汶川地震前后山东及周边地区地壳运动特征分析
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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 M s8.0 earthquake,we analyzed the baselines between Taian(TAIN) and several fiducial stations in different blocks by using SDFT 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.
In order to study the crustal movement of Shandong and surrounding areas before and after Wenchuan M s8.0 earthquake,we analyzed the baselines between Taian(TAIN) and several fiducial stations in different blocks by using SDFT 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.
引文
1王琪,张培震,马宗晋.中国大陆现今构造变形GPS观测数据与速度场[J].地学前缘,2002,9(2):415-429.
2顾国华.印尼8.7级大震前后GPS观测站的地壳水平与垂直位移时间序列结果[J].地震,2006,26(2):19-28.
3杨国华,等.华北地区的水平运动场与昆仑山8.1级地震的可能关系[J].大地测量与地球动力学,2007,27(2):10-15.
4张培震,王琪,马宗晋.中国大陆现今构造变形的GPS速度场与活动地块[J].地学前缘,2002,9(2):430-441.
5张培震,等.青藏高原及周边现今构造变形的运动学[J].地震地质,2004,26(3):367-377.
6 Documentation for the GAMIT GPS Analysis Software.De-partment of earth,atmospheric,and planetary sciences Mas-sachusetts institute of technology[s].Scripps Institution ofOceanography,University of California at San Diego,Release10.0-December 2000,29 October 2002.
7殷海涛,等.基于GPS观测网的山东地区地壳运动特征分析[J].西北地震学报,2008,30(3):276-281.
8 Jacobsen E and Lyons R.The sliding DFT[J].IEEE SignalProcessing Magazine,2003,20(2):74-80.
9金双根,朱文耀.太平洋板块运动和形变及其边缘现今相对运动[J].大地测量与地球动力学,2002,22(2):57-60.
10李杰,等.山东地壳运动GPS观测网的建设与初步结果分析[J].大地测量与地球动力学,2007,27(增刊):9-13.
11王敏,沈正康,董大南.非构造形变对GPS连续站位置时间序列的影响和修正[J].地球物理学报,2005,48(5):1 045-1 052.
12殷海涛,等.固体潮模型对GPS时间序列的影响研究[J].大地测量与地球动力学.2009,29(2):48-52.
2顾国华.印尼8.7级大震前后GPS观测站的地壳水平与垂直位移时间序列结果[J].地震,2006,26(2):19-28.
3杨国华,等.华北地区的水平运动场与昆仑山8.1级地震的可能关系[J].大地测量与地球动力学,2007,27(2):10-15.
4张培震,王琪,马宗晋.中国大陆现今构造变形的GPS速度场与活动地块[J].地学前缘,2002,9(2):430-441.
5张培震,等.青藏高原及周边现今构造变形的运动学[J].地震地质,2004,26(3):367-377.
6 Documentation for the GAMIT GPS Analysis Software.De-partment of earth,atmospheric,and planetary sciences Mas-sachusetts institute of technology[s].Scripps Institution ofOceanography,University of California at San Diego,Release10.0-December 2000,29 October 2002.
7殷海涛,等.基于GPS观测网的山东地区地壳运动特征分析[J].西北地震学报,2008,30(3):276-281.
8 Jacobsen E and Lyons R.The sliding DFT[J].IEEE SignalProcessing Magazine,2003,20(2):74-80.
9金双根,朱文耀.太平洋板块运动和形变及其边缘现今相对运动[J].大地测量与地球动力学,2002,22(2):57-60.
10李杰,等.山东地壳运动GPS观测网的建设与初步结果分析[J].大地测量与地球动力学,2007,27(增刊):9-13.
11王敏,沈正康,董大南.非构造形变对GPS连续站位置时间序列的影响和修正[J].地球物理学报,2005,48(5):1 045-1 052.
12殷海涛,等.固体潮模型对GPS时间序列的影响研究[J].大地测量与地球动力学.2009,29(2):48-52.
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