摘要
以 GPS、大面积水准、流动重力测量、跨断层流动形变测量等方面的监测和研究成果为主 ,围绕青藏块体的运动学特征、动力学特征、震源机制以及孕震机制进行了探讨和研究。结果表明 ,印度板块对我国大陆的碰撞和挤压 ,是青藏块体隆升及其周边地区地震孕育和发生的主要动力来源。大面积水准给出的垂直形变等值线的高密度区及其形态与多年来地震地质划分出的 5个区域大体一致。区域测量显示 ,在大震孕育发生的过程中 ,异常信息的空间演化存在由西南向东北推进的特征 ,且与构造相关。文章最后提出了“坝体决口孕震模式”
On the basis of the monitoring and research results of GPS,large scale levelling,mobile gravity measurements and mobile deformation measurements across faults,the paper makes an approach to and research on the characteristics of kinematics and dynamics,focal mechanism and earthquake preparation mechanism of the Qinghai Xizang block.The results indicate that the collision and compression of the Indian block with China's mainland are the main force sources of the Qinghai Xizang block rise and earthquake preparation and occurrence of the surrounding areas.The high density regions of vertical deformation contours and their shapes presented by large scale levelling are approximately consistent with the five regions divided by seismogeology in the past years.The regional measurements show that in the process of earthquake preparation and occurrence,the spatial variation of anomaly information is characterized by moving from southwest to northeast,and it correlates with tectonics.At the end of the paper,a new hypothesis of 'earthquake preparation model of energy dam failure' is presented
出处
《国际地震动态》
2002年第7期10-14,共5页
Recent Developments in World Seismology
基金
国家重点基础研究发展规划项目( G19980 40 70 0 )的资助
