青海大柴旦及周边地区尾波衰减特性研究  

Research on the Attenuation Characteristics of Coda Waves in Dachaidan and the Surrounding Areas of Qinghai Province

作　　者：李启雷[1] 李玉丽[1] 周庆玲[2] 杨广华[1] 杨理臣[1] 

机构地区：[1]青海省地震局,青海西宁810001 [2]黄河电力测试科技工程有限公司,青海西宁810001

出　　处：《防灾科技学院学报》2012年第2期25-30,共6页Journal of Institute of Disaster Prevention

基　　金：中国地震局三结合项目(201141)资助

摘　　要：采用Sato单次散射模型,利用大柴旦台数字地震资料,研究了大柴旦震群序列尾波Qc值在流逝时间窗长60～90 s时间内的变化特征,计算频率从3 Hz至18 Hz,得到Qc值随频率的变化关系:Qc(f)=(72±19.9)f0.93±0.08。计算结果反映出大柴旦地震余震序列的尾波Qc值较低,说明大柴旦震源区属于构造运动较为活跃的地区,这与大柴旦地质结构特征相符。By means of the single scatter mode（Sato）,the variation characteristics of coda Qc value of Dachaidan earthquake swarm sequence,recorded by Dachaidan Seismic Station,were analyzed in the S-wave lapse time ranging from 60 to 90 seconds;and the coda wave Q values were calculated in the frequency from 3 Hz to 18 Hz.We obtained the relationship between coda wave value and frequency,which is Qc（f）=72±21.6·f0.93±0.08.The calculation results reflect that the coda Qc value of Dachaidan earthquake aftershock sequence was in a low level.This means Dachaidan seismic zone belongs to the tectonic active area,in consistent with the geological structure features of Dachaidan area.

关 键 词：大柴旦 SATO模型 QC值 衰减特性 

分 类 号：P315.3[天文地球—地震学]