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本文根据大量浅源地震机制解,地面地震地质调查、资源卫星影像判读和其它地球物理资料、讨论了我国及其邻区现代构造形变的区域特征.它具体反映在我国东部地区,现代构造形变是以剪切破裂为主,断层活动多为北北东—北东向的右旋走滑性质,也有与之共轭的北西西—北西向的左旋走滑性质的断层活动.西部地区则以压缩形变为特征,主要表现在以青藏高原为主体的凸向东北的四重弧形构造带上,在第一和第四弧形带的东北部以挤压引起的逆断层活动为主,第二和第三弧形带是在挤压作用下,由于物质的横向推移而引起的走滑断层活动.此外现代构造形变的区域特征还反映在地壳厚度的分布轮廓上.造成我国及邻区这样一种现代构造形变特征的原因是与周围几个板块运动有密切关系的.
In this paper, the regional features of modern tectonic deformation in China and its neighboring areas are discussed based on a large number of shallow seismic mechanism solutions, ground seismic geology survey, resource satellite image interpretation and other geophysical data, which are specifically reflected in the eastern part of our country. Mainly shear-fractured faults, mostly fault activity in the north-northeast-northeast strike-right strike-slip and conjugate North-west-northwesterly left-lateral strike-slip faults, whereas in the western region, compressional It is mainly characterized by a quadruple arc structure convex to the northeast mainly on the Qinghai-Xizang Plateau, mainly thrust faults caused by extrusion in the northeast of the first and fourth arc zones, and the second And the third arc zone are the strike-slip faulting activities caused by the lateral displacement of the material under the action of extrusion. In addition, the regional characteristics of the modern tectonic deformation are also reflected in the distribution profile of the crustal thickness, resulting in such a The reason for the deformation of modern tectonics is closely related to the movement of several plates in the surrounding area.