兰州观象台存放台阵汶川M_S8.0强震动记录与分析

英文篇名：Strong Motion Records of Paking Array in Lanzhou Earth Observatary for Wenchuan M_S8.0 Earthquake and Prelimitary Analysis
中文刊名：西北地震学报
英文刊名：Northwestern Seismological Journal
作者：卢大伟 ; 姚凯 ; 闵祥仪 ; 王东彬
英文作者：LU Da-wei1 ; 3 ; YAO Kai2 ; MIN Xiang-yi2 ; WANG Dong-bin1(1.National Earthquake Infrastructure Service ; China Earthquake Administration ; Beijing 100036 ; China ; 2.Earthquake Administration of Gansu Province ; Lanzhou 73000 ; China ; 3.National Earthquake Infrastructure Service ; China Earthquake Administration ; Beijing 100036 ; China)
中文关键词：汶川大地震 ; 地震动 ; 兰州观象台存放台阵 ; 强震动记录
英文关键词：Wenchuan great earthquake ; Ground motion ; Paking array in Lanzhou Earth Observatary ; Strong ground-motion record
出版日期：2011-06-30
机构：中国地震局地球物理研究所;地壳运动监测工程研究中心;甘肃省地震局;
年：2011
期：02
出版单位：西北地震学报

摘要

兰州观象台存放台阵在汶川特大地震中获取了10组三分量数字强震动加速度记录。本文依据这些实际观测资料研究了黄土场地在地震发生后的自由场地面运动加速度过程及其特征。结果表明在震源、场地和震中距相同情况下,场地上不同测点记录的加速度峰值存在一定程度的差异,较明显地反映了场地地形对EW分向地面自由场加速度的影响。10个测点的峰值加速度(PGA)均显示EW向大于NS向,而垂直向最小;各测点的傅里叶谱值,尤其是在小于1Hz频段范围内,差异极小。
Paking array in Lanzhou Earth Observatary obtained ten groups of 3-directions strong ground motion records from the main shock of great Wenchuan earthquake.Based on the records the acceleration time history and characteristics of ground motion in loess site are studied.The result shows that peak ground acceleration(PGA) at different point in a small area of same site,with same seismic source and epicentral distance,had a certain degree of difference which obviously effected by site topography.In all ten strong motion observation points,PGA in EW direction were largest and PGA in the vertical direction were smallest.The difference of Fourier spectra in different points,especially for frequencies less than 1 Hz,is insignificant.

引文

[1]闵祥仪,姚凯,何新社.2003年10月25日甘肃平乐—山丹MS6.1地震强震动近场记录和分析[J].西北地震学报,2003,25(4):289-292.
    [2]刘旭宙,姚凯,何新社,等.2008年5月12日汶川MS8.0地震强震动记录与初步分析[J].西北地震学报,2008,30(3):266-269.
    [3]卢寿德,李小军主编.汶川8.0级地震未校正加速度记录[M].北京:地震出版社,2008.
    [4]姚凯,卢大伟,刘旭宙,等.利用汶川余震流动观测资料探讨地形对峰值加速度的影响[J].西北地震学报,2009,31(1):46-50.