宁夏西吉地区滑坡灾害地貌的成因分析
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摘要
宁夏西吉地区滑坡灾害地貌是海原地震区最严重的地形变特征。本文在分析区域滑坡呈带状或团块状密集独特分布及其严重灾害特征的基础上，进一步探讨了它的成因机制。表明滑坡地形变的分布规律不仅受地震烈度的影响，而且还受诸如黄土的自然特征、地质构造、地貌结构和区域新构造运动等自然环境的控制。
Locating in the west of Mt.Liupan in Ningxia,the Xiji region is the area where 9-10 degreeearthquake occurred in 1920.There is a great variety of slide hazard-induced landforms,includingbedding slide types on the bottom or in the middle of loess layer and longer-belts along loess ridge onright bank of the Hulu River.Although epicentral intensity of the earthquake was about 11 12 degree,the disastrous characters of landslides here were the most serious in comparison with all otherintensity areas.Based on the systematic description of distribution of slide hazard-induced 1andforms in the Xijiregion,the paper discusses deeply the formative mechanism of the landslide resultant forms.The result of study indicated that the origin of those was not only controlled under earthquake intensity butalso influenced by physical environment,such as natural property of loess,geologic structure,geomorphic texture,regional tectonic movement and so on.Therefore the scale and distribution of somekinds of ground deformations,e.g,landslide landforms,may be a bit of unconformity in contactwith its intensity degree within the meizoseismal area.
Locating in the west of Mt.Liupan in Ningxia,the Xiji region is the area where 9-10 degreeearthquake occurred in 1920.There is a great variety of slide hazard-induced landforms,includingbedding slide types on the bottom or in the middle of loess layer and longer-belts along loess ridge onright bank of the Hulu River.Although epicentral intensity of the earthquake was about 11 12 degree,the disastrous characters of landslides here were the most serious in comparison with all otherintensity areas.Based on the systematic description of distribution of slide hazard-induced 1andforms in the Xijiregion,the paper discusses deeply the formative mechanism of the landslide resultant forms.The result of study indicated that the origin of those was not only controlled under earthquake intensity butalso influenced by physical environment,such as natural property of loess,geologic structure,geomorphic texture,regional tectonic movement and so on.Therefore the scale and distribution of somekinds of ground deformations,e.g,landslide landforms,may be a bit of unconformity in contactwith its intensity degree within the meizoseismal area.
引文
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