长江三峡地区地震事件频谱特征及分类问题探讨
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摘要
用三峡地区29次地震事件的频谱特征,与三峡周边地区36次已知成因类型地震事件的频谱特征进行对比,结果显示,与构造地震相比,三峡地区地震事件记录波形低频成分比较丰富,优势频率、峰值频率和拐角频率等参数偏低。依据频谱参数特点,这29次地震事件可分为4类,即构造地震、浅表构造地震、介于构造与塌陷之间的地震和塌陷型地震,其中第三类地震事件居多。
A great many of micro-earthquake activities have been recorded in the neighborhood of Three Gorges after reservoir impounding since 2003.Frequency-spectrum of 36 known seismic events are firstly calculated,and then the characteristics of frequency-spectrum parameters are concluded.After contrasting them with seismic events on the Three Gorges area,the results show that there are comparatively abundant low frequency,and lower dominant frequency,peak frequency and corner frequency by comparing them with tectonic earthquakes.According to the characteristics of these frequency-spectrum,29 seismic events on the Three Gorges area are classified to four types: tectonic,surface tectonic,event between tectonic and collapse,and collapse.
A great many of micro-earthquake activities have been recorded in the neighborhood of Three Gorges after reservoir impounding since 2003.Frequency-spectrum of 36 known seismic events are firstly calculated,and then the characteristics of frequency-spectrum parameters are concluded.After contrasting them with seismic events on the Three Gorges area,the results show that there are comparatively abundant low frequency,and lower dominant frequency,peak frequency and corner frequency by comparing them with tectonic earthquakes.According to the characteristics of these frequency-spectrum,29 seismic events on the Three Gorges area are classified to four types: tectonic,surface tectonic,event between tectonic and collapse,and collapse.
引文
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7陈俊华,等.长江三峡库首区的Q值和场地响应[J].大地测量与地球动力学,2006,(增刊):112-116.(ChenJunhua,et al.Qvalue and site response in tree gorges region[J].Journal of geodesy and geodynamics,2006,(Supp.):112-116)
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9韩晓光,饶扬誉.长江三峡水库巴东库段地震成因分析[J].大地测量与地球动力学,2004,(2):74-77.(HanXiaoguang and Rao Yangyu.Analysis of genesis of reservoir-induced microquakes in Badong reach of Three Gorges[J].Journal of Geodesy and Geodynamics,2004,(2):74-77)
10陈蜀俊,姚运生,曾佐勋.三峡水库蓄水对库区孕震环境及潜在震源影响研究[J].大地测量与地球动力学,2005,(3):116-120.(Chen Shujun,Yao Yunsheng,Zeng Zuoxun.Effect of impounding on seismogenic environ-ment and potential focus in head region of Three gorges res-ervoir[J].Journal of Geodesy and Geodynamics,2005,25(3):116-120)
2 Aki K and Richards P G.Quantitative seismology theory andmethods.W.H.Freeman and Company,1980.
3陈运泰,等.数字地震学[M].北京:地震出版社,2000.(Chen Yuntai,et al.Digital Seismology[M].Bei-jing:Seismological Press,2000)
4沈萍,等.小震的综合识别研究[J].地震学报,2002,21(2):169-175.(Shen Ping,et al.Study on the methodfor comprehensive discrimination of small earthquakes[J].Seismological Journal,2002,21(2):169-175)
5张萍,等.辽宁台网记录爆破、矿震与地震的识别[J].地震地磁观测与研究,2001,22(22):29-34.(ZhangPing,et al.The distinguish of explosions mine-shocks andearthquake reading in Liaoning Seismic Network[J].Seis-mological and geomagnetic observation and research,2001,22(22):29-34)
6狄莉莎.三峡数字地震台网中心记录典型波形初步分析[J].大地测量与地球动力学,2004,(2):52-57.(DiLisha.Preliminary analysis of typical wave recorded by digit-al seismological network in Three Gorges[J].Journal of Ge-odesy and Geodynamics,2004,(2):52-57)
7陈俊华,等.长江三峡库首区的Q值和场地响应[J].大地测量与地球动力学,2006,(增刊):112-116.(ChenJunhua,et al.Qvalue and site response in tree gorges region[J].Journal of geodesy and geodynamics,2006,(Supp.):112-116)
8刘忠书,韩晓光,龚平.按新的水库诱发地震分类探讨长江三峡水库诱发地震的可能性[J].地壳形变与地震,1995,(2):51-58.(Liu Zhongshu,Han Xiaoguang andGong Ping.Investigation of possibility of reservoir inducedearthquake in the Three Gorges under the new classification[J].Crustal deformation and earthquake,1995,(2):51-58)
9韩晓光,饶扬誉.长江三峡水库巴东库段地震成因分析[J].大地测量与地球动力学,2004,(2):74-77.(HanXiaoguang and Rao Yangyu.Analysis of genesis of reservoir-induced microquakes in Badong reach of Three Gorges[J].Journal of Geodesy and Geodynamics,2004,(2):74-77)
10陈蜀俊,姚运生,曾佐勋.三峡水库蓄水对库区孕震环境及潜在震源影响研究[J].大地测量与地球动力学,2005,(3):116-120.(Chen Shujun,Yao Yunsheng,Zeng Zuoxun.Effect of impounding on seismogenic environ-ment and potential focus in head region of Three gorges res-ervoir[J].Journal of Geodesy and Geodynamics,2005,25(3):116-120)