摘要
利用小波变换方法将2000—2007年中国大陆重力场动态变化多尺度分解,获得不同小波尺度意义下的重力场动态累积变化。结果表明:1)一阶小波细节基本与构造活动无关;2)二阶小波细节较好地反映了青藏高原的隆升和汶川Ms8.0地震的孕育;3)三阶小波细节较好地反映了青藏高原的隆升及其内部物质向东运移、昆仑地震、汶川地震等较大尺度构造活动信息;4)三阶小波逼近较好地反映了印度板块对青藏高原的碰撞、太平洋板块向欧亚板块下的俯冲、华北地块现今运动趋势等大尺度构造活动信息。
Dynamic gravity field variations during the period from 2000 to 2007 in China mainland are decom- posed after the method of multi-scale decomposition of wavelet transform. The dynamic gravity field variations of the different-scale wavelet and the following results are drawn ： 1 ） The first-order wavelet details are independent of tec- tonic activities basically. 2 ） The second-order wavelet details well reflect the uplift of Tibetan Plateau and the prepa- ration of Wenchuan MsS. 0 earthquake. 3 ） The third-order wavelet details well give information about larger scale tectonic activities, such as uplift and eastward mass flow of Tibetan Plateau, Kunlun earthquake and Wenchuan earthquake. 4）The third-order wavelet approximations well give information about large-scale tectonic activities, such as the collision of India plate with Tibetan Plateau, the subduction of Pacific plate to Eurasian plate and the movement tendency of north China block.
出处
《大地测量与地球动力学》
CSCD
北大核心
2012年第3期7-16,共10页
Journal of Geodesy and Geodynamics
基金
地震行业科研专项(201008007)
关键词
重力场变化
小波变换
多尺度分解
构造活动
中国大陆
gravity field variations
wavelet transform
multi-scale decomposition
tectonic activities
China main-land
