三峡库区构造和塌陷地震的拐角频率特征
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摘要
利用频谱分析方法,对三峡数字遥测地震台网记录的ML2.0以上地震进行统计计算的结果表明:绝大多数构造型地震的拐角频率大于5.0Hz,塌陷型地震的拐角频率分布在2.5～4.5 Hz之间;拐角频率较小的塌陷型地震主要分布于煤矿和岩溶管道发育地区,如秭归泄滩和巴东官渡口、火峰等地;拐角频率较大的构造型地震主要分布在断裂构造带附近。
Statistical analysis on the earthquakes with magnitude greater than 2.0 in the Three Gorges area shows that the tectonic earthquake and collapsed earthquake have different corner frequency.The majority of the former is above 5.0Hz,and that of the latter is comparatively lower,around 2.5～4.5Hz.It can be taken as a identification basis,whereas,in real application,we should make comprehensive analysis of many other parameters.The collapsed earthquakes mainly occurred in the region with many mines and Karst,such as Xietan,Zigui county,Huofeng,Badong and so on.And the tectonic ones are prone to occur along the faults.
Statistical analysis on the earthquakes with magnitude greater than 2.0 in the Three Gorges area shows that the tectonic earthquake and collapsed earthquake have different corner frequency.The majority of the former is above 5.0Hz,and that of the latter is comparatively lower,around 2.5～4.5Hz.It can be taken as a identification basis,whereas,in real application,we should make comprehensive analysis of many other parameters.The collapsed earthquakes mainly occurred in the region with many mines and Karst,such as Xietan,Zigui county,Huofeng,Badong and so on.And the tectonic ones are prone to occur along the faults.
引文
1廖武林,张丽芬,姚运生.三峡水库地震活动特征研究[J].地震地质,2009,31(4):707-714.(Liao Wulin,Zhang Lifen and Yao Yunsheng.Characteristics of seismicity in the Three Gorges reservoir area[J].Seismology and Geology,2009,31(4):707-714)
2张丽芬,等.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 Lifen,et al.Analysis of time-frequency characteristics of wave spectrum between tectonic earthquake and mine earthquake[J].Seismology and Geology,2009,31(4):699706)
3张萍,等.爆破、矿震与地震的波谱差异[J].地震地磁观测与研究,2005,26(3):24-34.(Zhang Ping,et al.The differences of wave spectrum among explosion,mine tremor and earthquake[J].Seismological and Geomagnetic Observation and Research,2005,26(3):24-34)
4刘希强,等.区域矿震与地震的定量识别方法及其应用[J].中国地震,2005,21(1):50-60.(Liu Xiqiang,et al.The mode identification method and its application to regional mine and nature earthquakes[J].Earthquake Research in China,2005,21(1):50-60)
5和雪松,李世愚,沈萍.用小波包识别地震和矿震[J].中国地震,2006,22(4):425-434.(He Xuesong,Li Shiyu and Shen Ping.A wavelet packet approach to wave classification of earthquake and mining shocks[J].Earthquake Research in China,2006,22(4):425-434)
6狄莉莎,陈俊华.长江三峡地区巴东野三关地震成因探讨[J].大地测量与地球动力学,2007,(专刊):62-67.(Di Lisha and Chen Junhua.On genesi of Yesanguan micro earthquakes in Three Gorges area on Yangtze river[J].Journal of Geodesy and Geodynamics,2007,(Spe.):62-67)
7李胜乐,严尊国,薛军蓉.长江三峡水库蓄水后的首发微震群活动[J].大地测量与地球动力学,2003,(4):75-89.(Li Shengle,Yan Zunguo and Xue Junrong.First microquakes swarm activity since storage in Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2003,(4):75-89)(下转第40页)
8陈蜀俊,苏爱军,罗登贵.长江三峡水库诱发地震的成因类型[J].大地测量与地球动力学,2004,(2):70-74.(Chen Shujun,Su Aijun and Luo Denggui.Genesis and type of induced earthquake in Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2004,(2):70-74)
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,2004,24(2):75-78.(Han Xiaoguang and Rao Yangyu.Analysis of genesis of res-ervoir induced microquakes in Badong reach of Three Gorges[J].Journal of Geodesy and Geodynamics,2004,(2):75-78)
10吴海波,姚运生,薛军蓉.长江三峡地区地震事件频谱特征及分类问题探讨[J].大地测量与地球动力学,2010,(6):10-15.(Wu Haibo,Yao Yunsheng and Xue Junrong.Discussion of frequency-spectrum characteristics and classfied problem of seismic event on Three Gorges[J].Journal of Geodesy and Geodynamics,2010,(6):10-15)
2张丽芬,等.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 Lifen,et al.Analysis of time-frequency characteristics of wave spectrum between tectonic earthquake and mine earthquake[J].Seismology and Geology,2009,31(4):699706)
3张萍,等.爆破、矿震与地震的波谱差异[J].地震地磁观测与研究,2005,26(3):24-34.(Zhang Ping,et al.The differences of wave spectrum among explosion,mine tremor and earthquake[J].Seismological and Geomagnetic Observation and Research,2005,26(3):24-34)
4刘希强,等.区域矿震与地震的定量识别方法及其应用[J].中国地震,2005,21(1):50-60.(Liu Xiqiang,et al.The mode identification method and its application to regional mine and nature earthquakes[J].Earthquake Research in China,2005,21(1):50-60)
5和雪松,李世愚,沈萍.用小波包识别地震和矿震[J].中国地震,2006,22(4):425-434.(He Xuesong,Li Shiyu and Shen Ping.A wavelet packet approach to wave classification of earthquake and mining shocks[J].Earthquake Research in China,2006,22(4):425-434)
6狄莉莎,陈俊华.长江三峡地区巴东野三关地震成因探讨[J].大地测量与地球动力学,2007,(专刊):62-67.(Di Lisha and Chen Junhua.On genesi of Yesanguan micro earthquakes in Three Gorges area on Yangtze river[J].Journal of Geodesy and Geodynamics,2007,(Spe.):62-67)
7李胜乐,严尊国,薛军蓉.长江三峡水库蓄水后的首发微震群活动[J].大地测量与地球动力学,2003,(4):75-89.(Li Shengle,Yan Zunguo and Xue Junrong.First microquakes swarm activity since storage in Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2003,(4):75-89)(下转第40页)
8陈蜀俊,苏爱军,罗登贵.长江三峡水库诱发地震的成因类型[J].大地测量与地球动力学,2004,(2):70-74.(Chen Shujun,Su Aijun and Luo Denggui.Genesis and type of induced earthquake in Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2004,(2):70-74)
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,2004,24(2):75-78.(Han Xiaoguang and Rao Yangyu.Analysis of genesis of res-ervoir induced microquakes in Badong reach of Three Gorges[J].Journal of Geodesy and Geodynamics,2004,(2):75-78)
10吴海波,姚运生,薛军蓉.长江三峡地区地震事件频谱特征及分类问题探讨[J].大地测量与地球动力学,2010,(6):10-15.(Wu Haibo,Yao Yunsheng and Xue Junrong.Discussion of frequency-spectrum characteristics and classfied problem of seismic event on Three Gorges[J].Journal of Geodesy and Geodynamics,2010,(6):10-15)
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