三峡重点监视区构造地震与矿震时频谱特征分析  

ANALYSIS OF TIME-FREQUENCY CHARACTERISTICS OF WAVE SPECTRUM BETWEEN TECTONIC EARTHQUAKE AND MINE EARTHQUAKE

作　　者：张丽芬[1,2] 廖武林[1,2] 曾夏生 钟羽云 

机构地区：[1]中国地震局地震研究所,武汉430071 [2]中国地震局地球物理研究所,北京100081 [3]湖北中南勘察基础工程有限公司,武汉430081 [4]浙江省地震局,杭州310013

出　　处：《地震地质》2009年第4期699-706,共8页Seismology and Geology

基　　金："十一五"国家科技支撑计划项目(2006BAC01B040202);国家自然科学基金重点项目(40730317);中国地震局地震研究所所长基金(IS200756052)共同资助

摘　　要：基于三峡数字遥测地震台网记录的数字化波形资料,利用谱图时频分析方法,研究了三峡地区构造地震和矿震波谱的时频特征,发现二者的时频谱特征存在着明显的差异:1)构造地震波主频高于矿震;2)构造地震波的频率成分比矿震丰富,能量密度频谱随频率轴展布较宽,前者带宽是后者的4倍;3)矿震能量强度的峰值在整个波列中出现的时间较构造地震早,且能量衰减较快。There are many kinds of earthquakes in the Three Gorges area, such as tectonic earthquake, mine earthquake,reservoir induced seismicity and so on. And different earthquakes have different charac-teristics. But as far as this area is concerned, the majority of the earthquakes belong to micro-earthquakes and small earthquakes, so it is comparatively more difficult to identify their causes and types. The Three Gorges seismic network is a very good platform,which offers us very good earthquake data to do some research on the identification. In this paper, time-frequency spectrum method is used to analyze the difference between tectonic earthquake and mine earthquake, and this is the first step. By comparison, it is found there is obvious difference between them. Firstly, the main frequency of mine earthquake wave is lower than that of tectonic earthquake. And the main frequency of the former mainly centers around 2.2Hz, however the latter is around 5.5Hz. Secondly,the frequency component of tectonic earthquake wave is more abundant than that of mine earthquake, the former＇s energy density spectrum spreads more broadly along frequency and time axes, being 4 times broader than the latter. And it has many frequency segments with intense energy. Thirdly, the maximum value of energy inten- sity of mine earthquake wave occurs in all wave train earlier than that of tectonic earthquake and the energy decays quickly.

关 键 词：构造地震 矿震 时频分析 三峡 

分 类 号：P315.31[天文地球—地震学]