摘要
采用小波变换多尺度分解技术 ,对华北地区布格重力异常进行分解 ,获得自地表至 Moho界面深度范围内不同尺度的密度异常体产生的重力异常。讨论了各阶变换异常细节特性及相应地质构造特征 ,认为各阶小波变换细节分别反映了地壳不同深度在一定尺度意义上的介质密度的分布特性 ,表明华北地区很多断裂 ,特别是深大断裂两侧的岩性密度确实存在着较大差异 ,记录了地壳形成演化的历史。还对该区 MS≥ 7.
Bouguer gravity anomaly in North China is decomposed with multi-scale decomposition technique of wavelet transform, and gravity anomalies produced by anomalous density bodies of varying scales from surface to Moho are revealed. Characteristics of anomaly of different orders and corresponding structural features are discussed. Details of wavelet transform of different orders reflect the distribution features of rock density at different depths in certain scales. The difference in rock density is embodied in horizontal distribution pattern, scales of rock masses and in the vertical extension of depths as well. It records the history of the formation and evolution of the crust. Besides, in most cases the two sides of a fault-especially a deep and large fault-in North China differ greatly in rock density. Deep structural setting for the Ms≥7.0 strong earthquakes in this region is also discussed.
出处
《大地测量与地球动力学》
CSCD
2002年第1期34-39,共6页
Journal of Geodesy and Geodynamics
基金
家自然科学基金 (4 97742 3 0 )
国家重点基础研究发展规划<大陆强震机理与预测>(G19980 40 70 2 )共同资助 中国地震局地球物理勘探中心论著编号 :RCEG2 0 0 12 7
关键词
小波多尺度分解
布格重力异常
介质密度
地震活动
华北地区
multi scale decomposition of wavelets, Bouguer gravity anomaly, rock density, seismic activity, North China
