乌鲁木齐中强地震地震动特征分析

以乌鲁木齐烈度速报台网建成以来发生的乌鲁木齐MS4.5以上中强地震强震动数据记录为依据,统计分析强震动加速度记录特征及对建筑物的影响。分析结果表明,乌鲁木齐区域地震动峰值加速度高于新疆区域土层衰减曲线;计算3个典型台站记录的5%阻尼比加速度反应谱,其周期在0.1~0.4 s范围内,高于规范设计反应谱谱值,且在周期0.4 s后迅速下降到规范设计谱值以下;同时拟合了乌鲁木齐地区PGA与PGV对数线性关系,为本区域中强地震PGA与PGV换算提供参考依据,通过PGA与PGV联合计算其仪器烈度。

STRONG GROUND MOTION CHARACTERISTICS OF MEDIUM-STRONG EARTHQUAKE IN URUMQI

Based on the data records of medium and strong earthquakes above MS4.5 occurred in Urumqi since the establishment of the Urumqi rapid intensity report network,the characteristics of strong earthquake records and their influence on buildings are statistically analyzed.The results are as follows:the peak acceleration value of ground motion in Urumqi region is higher than the attenuation curve of soil layer in Xinjiang region;the 5%damping specific acceleration response spectrum period recorded by three typical stations is selected All of them are in the range of 0.1~0.4 s,higher than the standard design spectrum value,and rapidly decline to below the standard design spectrum value after the period of 0.4 s;at the same time,the logarithmic linear relationship between PGA and PGV in Urumqi area is fitted,which can be used to convert the PGA and PGV values of medium and strong earthquakes in this area,and the instrument intensity is calculated through the combination of PGA and PGV.