中国东部及其邻域岩石圈底界面特征及地震活动性

CHARACTERISTICS OF THE LITHOSPHERIC BOTTOM INTERFACE AND SEISMICITY IN EASTERN CHINA AND ITS VICINITY

对布格异常采用小波变换场分离技术得到深部重力异常 ,利用其他地球物理方法获得较可靠的先验信息作为约束 ,并采用球谐函数的级数解形式对中国东部及其邻域的深部重力异常进行联合反演 ,获得了该区岩石圈底界面的展布图像 ;同时对岩石圈底界面特征和强地震分布特性进行了讨论 ,指出中国东部及其邻域在地貌分布、各种地球物理场和岩石圈结构等方面都明显地具有分区性 ,很可能与深部岩石圈底界面的变化有关 ,而岩石圈底界面的形态的差异将对岩石圈层的运动和一系列地质过程产生重要作用 。

The deep gravity anomaly is obtained from Bouguer anomaly using the technique of wavelet transform separation. Constrained by authentic prior information from other geophysical methods and using series solution of spheric harmonics,a joint inversion is carried out with respect to the deep gravity anomaly in eastern China and the adjacent areas. The distribution pattern of the lithospheric bottom interface is revealed. The characteristics of the lithospheric bottom interface and distribution pattern of strong earthquakes are also discussed. The study shows that eastern China and its vicinity is characterized by zoning with respect to geomorphic distribution,various geophysical fields and lithosphere structure. This behavior is likely related to the depth variation of the lithosphere. The difference in the lithospheric bottom interface pattern affects the movement of the lithosphere and a series of geological processes. The distribution of strong earthquakes is also closely related to the lithospheric bottom interface pattern and tectonic environment. [