新疆南天山地区土层场地地震动峰值加速度衰减关系

The attenuation relationship of peak ground motion acceleration on soil site at the south Tianshan region in Xinjiang

南天山地区是天山地震构造区现今构造运动最为强烈的地区,该地区地震活动频度高、强度大。本文选取了南天山地区1985～2010年6月15日M≥3.5地震的强震动记录共360条,采用改进的两步回归法拟合了该地区土层加速度衰减规律。通过回归结果和实际记录资料的对比分析,发现模型Ⅱ的衰减曲线与实际观测资料拟合度更高,同时也发现水平向回归结果好于垂直向的回归结果。与该地区的其它地震加速度衰减关系研究成果相比,此衰减关系与实际记录的吻合度较高。

The south Tianshan region has most intense tectonic movement in the Tianshan seismic zone construction.The seismic activity is of high frequency and strength.The paper uses two-step regression method to fit acceleration attenuation relationship of moderate-strong earthquake in soil site on the basis of the acceleration recordings of strong motions(MS ≥3.5) from 1985 in the south Tianshan region,Xinjiang.The compared regression results with actual recorder data reveal that the acceleration attenuation curve ...