摘要
本研究区在现代构造活动分区上分別属于华北断块隆起张裂区和华南隆起区。同我国西部比较,本区地质基底古老、地壳相对稳定,地震频度较低、但强度不小,中强地震不少。在本研究区中环渤海地区地震活动性最高,东南沿海地区次之,长江三角洲及其邻区最弱,但地震活动在时间上大致同步。目前本区的地震活动仍处于活跃期,但接近尾声。本活跃期早则在本世纪90年代,晚则在下一世纪初结束进入平静期,因此,本区在未来50～100年内仍存在发生多次中强震甚至发生强震的危险。
This study area belong to the upwarped extension-cracking district of fault block in the Northern China, respectively, to the uppwarped district of the Southern China in recent structural active zoning. Comparing with west part of China, the studied area have older geological basement, stabler crust, lower earthquake frequency, but higher earthquake intensity and more fregquent moderate earthquakes. In this area earthquake activity of the Circum-Bohai district is the strongest, that of the east-southern nearshore district is secondary, that of the Chang Jiang delta and its adjacent district is the weakest, but thier earthquake activities are almost simultaneous. At present the earthquake activities of this area still are in active stage, but tend to end, probably, their will end in 1990's or at the beginning of next century, then enter into the quiet stage of next active period. Therefore, moderate earthquakes still will frequently occur; or strong earthquake will occasionally occur in 50-100 year's time.
出处
《地震学刊》
CSCD
1991年第2期63-73,共11页
Journal of Seismology
