2003年10月25日民乐—山丹M_S6.1、5.8地震加速度记录特征分析

Analysis on Characteristics of Acceleration Records for the Minle-Shandan M_S6.1,5.8 Earthquakes on Oct.25,2003

2003年10月25日甘肃民乐—山丹发生MS6.1、5.8地震,在时域和频域内对记录到的94条282道加速度记录进行了处理和分析,结果显示:(1)垂直向加速度峰值一般小于水平向;(2)震中距50 km尤其是30 km以内区域是主要地震灾区;(3)不同情况影响速度反应谱的主要因素不同,实际工作中应区别对待。

On Oct. 25, 2003 occurred the Minle-Shandan Ms6. 1, 5.8 earthquakes in Gansu. To Nov. 12, 2003, altogether occurred 67 shocks and triggered 94 items （282 channels） of acceleration records. We process the records in time and frequency domains. The results show. （ 1 ） vertical acceleration peaks are bigger than horizontal ones generally ; （2） the area within 50 km, specially the area 30 km from the epicenter, is main earthquake disaster area; （3） the factors to effect acceleration response spectrum differ with varying situations, so it is necessary to pay attention to key factors in practice.