渤海地区地震的频发性与震源环境特征

本文根据有历史记载以来渤海地震区的地震资料,通过华北、华南及东北等地震区的比较,讨论了渤海震区强震的频发性特点。同时根据渤海震区的地温场、重力场、电磁场等地球物理场及其有关反演解释资料以及地质构造、现代构造应力场等,分析了渤海震区的震源环境条件,通过与华北等震区对比阐述了渤海地震区震源环境特征。讨论了该震源环境条件对渤海震区地震频发性的影响和作用。

THE CHARACTERISTIC OF THE FREQUENT OCCURRENCES OF EARTHQUAKES IN THE BOHAI SEA AREA AND THE FOCAL ENVIRONMENT

From the data of earthquakes in the Bohai Sea area since the beginning of the records inhistory,the characteristic of the frequent occurrences of large earthquakes in the area is dis-cussed compared with that in North China,South China and Northeast China in this paper.Wehave also analysed the focal conditions of the Bohai Sea earthquake area,based on thegeophysical fields of geothermal,gravity and electricmagnetic field;the interpretations of rele-vant inversion results the geological structure and contemporary tectonic stress fields etc..Thecharacteristic of the focal environment is presented,compared with that in North Chinaearthquake area and other earthquake areas.The effect of the focal conditions on the character-istic of the frequent occurrences of earthquakes in this area is discussed.