中国大陆地震活动分期及其与构造运动的关系

Variation of Seismicity in Chinese Continent and its Relation to Tectonic Movement

利用应变积累释放曲线的方法，讨论中国各主要地震区带的平静－活跃期现象及其与构造运动之间的联系。中国西南地区的地震活动反映了由印度—欧亚板块碰撞引起的动力作用由西向东、由南向北的推进过程。华北地区的地震活动性变化与华东－华中和祁连山－秦岭地区形态相似，但在时间上有４０～５０年的滞后。东南沿海地区的历史地震活动与祁连山－秦岭至华东地震区的变化形态相似而且在时间上同步。东南沿海和台湾两个地区在本世纪内的应变积累释放曲线完全不同。现有的资料表明，在各地震带地震活跃期的时间次序和大地构造运动的动力来源之间存在一定的联系。可以认为，整个中国大陆浅源地震的构造动力源是印度—欧亚板块碰撞及青藏高原的隆起。

By analyzing the curves of strain accumulation and release in the major seismic regions of China, we study the phenomenon of alternative quiet and active periods of seismicity and its relation to the tectonic movements in China. The earthquake activities in Southwest China reflect the eastward and northward progression of tectonic movements caused by the collision between the Indian and Eurasian plates. The temporal variation of seismicity in North China is similar to that in foe Central-to-Eastern China and the Qilian -Qingling Mountains region, but lags by 40 to 50 years behind the latter two regions. The historic earthquake records in the southeast coastal area show similar and synchronous variation with that in the regions from Qilian-Qingling Mountains to Eastern China. The strain accumulation release curves of the southeast coastal area and the Taiwan region in the twentieth century are totally different. The available data indicate that there is a certain connection between the sequence of active periods among various seismic regions and the driving force of tectonic movements. It is suggested that the tectonic force which cau ses the shallow earthquakes in entire Chinese mainland comes from the collision of Indian and Eurasian plates and the uplift of the Qinghai-Xizang plateau.