摘要
在北天山中段第一排构造外围的宁家河—三个泉河之间 ,有一由北倾断裂形成的反向陡坎。该陡坎应为断裂多次错动的结果。陡坎形成初期 ,坎南为断塞塘 ,沉积物年龄为 5 0 0 0 a。在宁家河剖面可见河谷阶地砾石向上游倾斜 ; 级阶地错动 3～ 4m。依断裂模式归类 ,江南庙断裂为后逆冲断裂。这类断裂是否能发生 7级以上地震 ,断裂坎是否是古地震造成 ,尚不能确定。
In the periphery of the first row of structure in the middle section of North Tianshan, there is a reverse scarp that was formed by a thrust dipping roward north. It is considered to be a result of many times of dislocations of the fault.In the early period when the scarp formed a sreies of fault barrier ponds shaped to the south of the scarp, There the age of the deposit is 5 000 a. It can be seen form Ningjiahe profile that the gravel in Valley terrace inclines to the upstream and the second-order terrace has a dislocation of 3～4m.Classfied by fault modes, jiangnanmiao fault is a back-thrust fault. At present,it isn't clear whether Ms≥7.0 earthquakes could by produced by this kind of faults and whether the scarp was formd by paleoeartquakes.
出处
《内陆地震》
2000年第2期128-131,共4页
Inland Earthquake
关键词
逆断层
断层陡坎
北天山
断塞塘
地震地质
Reversed fault Fault scarp North Tianshan Fault barrier pond
