珊溪水库地震与构造地震波谱时-频特征的对比研究  

CONTRAST OF TIME-FREQUENCY CHARACTERISTICS OF WAVE SPECTRUM BETWEEN SHANXI RESERVOIR INDUCED EARTHQUAKE AND TECTONIC EARTHQUAKE

作　　者：周昕[1] 钟羽云 傅建武 杨福平 张帆 

机构地区：[1]中国科学技术大学地球与空间科学学院,合肥230026 [2]浙江省地震局,杭州310013

出　　处：《大地测量与地球动力学》2006年第4期86-91,共6页Journal of Geodesy and Geodynamics

基　　金：浙江省一般科研社会发展项目:"浙江省水库诱发地震趋势判断方法研究"(2006C33059)

摘　　要：基于2002～2006年浙江地震台网记录的数字化波形资料，利用时-频分析方法，研究了珊溪水库诱发地震和构造地震波谱的时-频特征，发现两者的P波波谱存在差异：1）水库诱发地震P波主频低于构造地震；2）水库诱发地震P波频率成分比构造地震丰富，能量密度频谱随频率轴展布较宽，且出现多个能量较强的频率段；3）水库诱发地震P波能量强度的峰值在整个波列中出现时间较构造地震早且能量衰减快。On the basis of the digital seismic wave data from 2002 to 2006 recorded by the station network in Zhejiang province, with time-frequency analysis method, the time-frequency characteristics of wave spectrum of induced earthquakes in Shanxi reservoir and tectonic earthquakes in Zhejiang have been investigated. It is found that there are differences between them ： 1 ） the main frequency of induced earthquake is lower than that of tectonic earth- quake;2） the P-wave frequency components of induced earthquake in Shanxi reservoir are more abundant than that of tectonic earthquake, the former＇ s energy density spectrum spreads more broadly along frequency axes, and it has many frequency segments with intense energy;3） the maximum value of energy intensity of P-wave of induced earthquakes occurres in all wave train earlier than that of tectonic earthquake and the energy decays quickly.

关 键 词：珊溪水库 水库诱发地震 构造地震 地震波谱 时频分析 

分 类 号：P315.31[天文地球—地震学]