摘要:
鄂尔多斯地块位于中国大陆北部,其周邻地震活动十分频繁。本文依据该区历史地震活动及构造发育情况,结合部分试验结果,把鄂尔多斯地块周邻划分了四个应力集中区:一对以隆起为主的压应力集中区和一对以断陷为主的张应力集中区。隆起区为太原-北京区和海原-古浪区;断陷区为汾渭区和河套区。分析各区强震活动,发现以呼和浩特-宝鸡为界,西北和东南两大区中的M≥6级地震活动,存在着134-329年交替发生的现象。看来,下一个活动区以邢台地震为信号转移到太原-北京区和汾渭区中,其强震活动将要持续一百余年。目前汾渭区中的平静值得注意。
Abstract:
Eerduosi Block is located in the northern part of China's continent and in its surrounding area seismic activity is quite frequent.In this paper basing on historical seismic activity and tectonic development in this area and combining a part of experimental results, this surrounding area of Eerduosi Block is divided into 4 stress concentrated areas: one pair of compressive stress concentrated areas where uplifts are dominative and one pair of tensile stress concentrated areas in which faults are dominative.The uplifted areas are Taiyuan-Beijing area and Haiyuan-Gulang area; the downfaulted areas are Fenwei area and Hetao area.From the analysis of strong seismic activity in each area, it is found that in both northwest and southeast areas bounded by Huhehote-Baoji, earthquakes with M≥6 ocourred alternatively in 134-392 years.It seems that the next seismic active area after the Xingtai earthquake will be moved to Taiyuan-Beijing area and Fenwei area, where strong seismic activity will last more than oneehundred years.The recent quiecent in Fenwie area should attract more attention.
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