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一、前言北京平原位于华北平原西北角,地处燕山南缘与太行山东北缘衔接地带。源自燕山山脉的潮白河及太行山山脉的永定河构成北京平原区两大水系。北京平原属于山前冲洪积平原,总体地势西北高东南低,海拔高程50～10m,坡降5‰。北京市坐落在北京冲洪积平原的后缘。北京平原的活动构造为隐伏活动构造,增加了该地区地震构造研究的难度。本文将展示近年对这一地区主要活动断裂开展调查取得的主要结果,并对该地区未来强震危险性进行探讨。
I. Introduction The Beijing Plain is located at the northwestern corner of the North China Plain and is located at the junction of the southern margin of Yanshan and the northeast margin of Taihang Mountain. The Chaobai River originating from the Yanshan Mountains and the Yongding River from the Taihang Mountains constitute the two major river systems in the Beijing Plain. The Beijing Plain belongs to the alluvial plain in front of the piedmont. Its overall topography is low in the southeast of Northwest China. Its elevation is 50 ~ 10m and its slope is 5 ‰. Beijing is located in the rear margin of the alluvial plain in Beijing. The tectonic activity in the Beijing Plain is constructed as a concealed active structure, which makes it more difficult to study the seismic structure in the area. This article will show the main findings from surveys on major active faults in this area in recent years and discuss the danger of future strong earthquakes in the area.