晋冀鲁豫交界地区地震地质条件
ON SEISMOTECTONICS AROUND THE JUNCTURE OF SHANXI,HEBEI,SHANDONG AND HENAN PROVINCES
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摘要: 晋冀鲁豫交界地区是华北地块一级构造单元。该单元处于太行山断块、冀鲁断块、皖豫断块的交汇部位,是北东-北北东向的太行山山前断裂带、沧东-聊考断裂带与北西向的磁县-大名断裂、新乡-商丘断裂的扭结区,并构成以内黄隆起为中心的,西、东两侧隆起,北、南两边沉陷的鞍状构造。从新构造活动及地震震源机制分析得出:本区自第三纪末-第四纪以来受北东东-南西西方向的区域主压应力的控制,故新构造活动在保留原有升降运动的基础上,以水平扭动为主,并伴有掀斜升隆及块体的框动。本区地震活动呈显明的条带分布,明显地受太行山山前断裂带及沧东-聊考断裂带的控制,构成太行山东麓地震活动区及沧东-聊考地震活动区。而北西西向断裂的切错常成为具体的发震条件。可能由于内黄隆起块体的框动的影响,本区重要的强震及中强震围绕着它呈中心对称分布。Abstract: The juncture of Shanxi, Hebei, Shandong and Henan provinces is a tectonic location where the first-order tectonic units of North China block-T aihang mountain fault block, Hebei-Shan dong fault block and Anhui-Henan fault block meet.Also, it is a twisted region of Taihang mountain piedmont fault zone,Cangdong-Liaokao fault zone (striking NE-NNE) and Cixian-Damis fault and Xinxiang-Shangqiu fault (striking NW), and it forms a saddlelike structure, which is centered at Neihuang rise,uplifting at eastern and western sides and subsiding at southern and northern sides.From neotectonic activity and earthquake mechanism we conclude, this region has been controlled by NEE-SWW regional principle compressive stress since the late Tertiary and Quaternary? so the neotectonic activity has been dominated by horizontal shearings and associated with tilting and constrained block motion on the basis of the original elevation and subsidence.The seismicity in this region appears as zonal distribution,is obviously controlled by Taihang mountain piedmont fault zone and Cangdong-Liaokao fault zone, and forms Taihang mountain piedmont and Cangdong-Liaokao seismic belts.The intersecting of the NWW-striking faults is usually as a specific earthquake-induced condition.It seems that, under the influence of the constrained motion of Neihuang rise block,the major strong and moderate earthquakes in this region symmetrically distribute around this block,
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