三峡重点监视区构造地震与矿震时频谱特征分析

doi:10.3969/j.issn.0253-4967.2009.04.013

地震地质 ›› 2009, Vol. 31 ›› Issue (4): 699-706.DOI: 10.3969/j.issn.0253-4967.2009.04.013

三峡重点监视区构造地震与矿震时频谱特征分析

张丽芬^1,2, 廖武林^1,2, 曾夏生³, 钟羽云⁴

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

收稿日期:2009-01-06 修回日期:2009-11-08 出版日期:2009-12-24 发布日期:2010-04-17
作者简介:张丽芬,女,1981年生,2006年毕业于东华理工大学构造地质专业,获硕士学位,助理研究员.现从事水库诱发地震研究工作,电话:13971378470,E-mail:zhanglf112@163.com.
基金资助:
“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

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

ZHANG Li-fen^1,2, LIAO Wu-lin^1,2, ZENG Xia-sheng³, ZHONG Yu-yun⁴

1. Institute of Seismology, China Earthqualie Administration, Wuhan 430071, China;
2. Institute of Geophyscics, China Earthquake Administration, Beijing 100081, China;
3. Hubei Central South Exploration and Foundation Engineering Co. Gtd，Wuhan 430081, China;
4. Earthquake Administration of Zhejiang Province, Hangzhou 310013, China

Received:2009-01-06 Revised:2009-11-08 Online:2009-12-24 Published:2010-04-17

摘要/Abstract

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。

关键词: 构造地震, 矿震, 时频分析, 三峡

Abstract: 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 characteristics. 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 intensity of mine earthquake wave occurs in all wave train earlier than that of tectonic earthquake and the energy decays quickly.

Key words: tectonic earthquake, mine earthquake, time-frequency analysis, Three Gorges region

中图分类号:

P315.3⁺1

张丽芬, 廖武林, 曾夏生, 钟羽云. 三峡重点监视区构造地震与矿震时频谱特征分析[J]. 地震地质, 2009, 31(4): 699-706.

ZHANG Li-fen, LIAO Wu-lin, ZENG Xia-sheng, ZHONG Yu-yun. ANALYSIS OF TIME-FREQUENCY CHARACTERISTICS OF WAVE SPECTRUM BETWEEN TECTONIC EARTHQUAKE AND MINE EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2009, 31(4): 699-706.

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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

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