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唐山震区的震害分布,在发震断裂控制的背景上,明显地受地质条件的影响,自北向南呈有规律的变化:山间盆地地区多为震害高异常区,并从盆地边缘到盆地的沉积中心,随着覆盖土层的逐渐增厚和地下水逐渐变浅,震害不断加重;平原区出现的砂土液化,区域上受地质地貌条件控制,小范围场地受砂土层顶板埋深及厚度的影响。
The distribution of seismic damage in the Tangshan earthquake area is obviously affected by the geological conditions in the background of the seismogenic fault control and varies regularly from north to south. Most of the mountain basin area is high-anomalous area of seismic damage, and from the edge of the basin To the sedimentary center of the basin. With the gradual thickening of the covering soil layer and gradual shallowing of the groundwater, the earthquake damage is aggravating. The sandy soil liquefied in the plain area is controlled by the geological and geomorphological conditions in the area. The small area of the site is covered by the sand roof Depth and thickness of the impact.