甘肃省若干地段强震地面运动特征

Characteristics of Ground Motion during Strong Earthquakes in Some Regions of Gansu Province

摘要:

以甘肃、陕西等地历年来获得的强震记录,主要是汶川大震的强震记录,研究了甘肃省强震地面运动的特征以及不同场地的地震反应。注意到本地地震动具有大陆板内地震的特点,与强震记录最多的美国西部地震动有较大的差别。甘肃的场地类型大致可以分为四个区域:河西走廊、黄土地区、陇南山区和甘南高原区,强震地面运动特征各自具有其自身的特点,又和地震动的特性有密切的关系。认为有必要对汶川大震的强震记录作全面而系统的研究,进而应用到我国的地震安全性评价中去。

Abstract:

Based on the strong motion recordings,especially the recordings of the great Wenchuan Earthquake in Gansu and Shaanxi,the characteristics of ground motion during strong earthquakes and the response features of different sites in Gansu province are studied.It is denoted that local earthquakes have special characteristics of ground motion which are identified from the interplate events,and they have big difference from events in western U.S.A..Also the characteristics of ground motion are closely depended on the site conditions and local topography,so the Gansu territory is able roughly departed into 4 areas with different site conditions,i.e.,Hexi Corridor,the loess regions in central part of Gansu,the mountain region in Southern Gansu and the plateau in Southern Gansu.Every area possesses special features of ground motion and its characteristics are depended upon the earthquake mechanism.The author proposes to study the recordings of the great Wenchuan Earthquake should be in details.