喀什“奇异震群”与构造地震的对比研究
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摘要
20 0 1年 11月 14、 15日新疆喀什台记录到 86次振动事件 (“奇异震群”事件 )。为识别其性质 ,应用波谱分析、偏振分析等方法 ,对该事件和同范围构造地震的地震波特征进行了对比研究 ,发现 :(1)喀什“震群”的全波列衰减比构造地震的全波列衰减快很多 ;(2 )与构造地震的速度谱相比 ,“震群”的频谱相对较为“集中”,而构造地震的则较为“发散”;(3)“震群”位移谱的拐角频率和卓越频率均较构造地震的相应量高出一倍多 ,且离散较小。通过对喀什“奇异震群”这些特征进行分析研究 ,认为这一事件极有可能是人工事件
On Nov.14-15, 2001, Kashi seismostation in Xinjiang, China, recorded 86 vibrations (named as "bizarre earthquake swarms" event). In order to recognize their character, the authors made a comparison research on the features of waves between the event and the tectonic earthquakes that occurred in the same area using wave spectrum analysis and polarization analysis. It is found that (1) the full wave train of "earthquake swarms" attenuated much more quickly than that of the tectonic earthquakes; (2) the velocity spectra of "earthquake swarms" are centralized, while those of the tectonic earthquakes are relatively divergent; (3) the corner frequency and predominant frequency of "earthquake swarms" are above two times of those of the tectonic earthquakes, and with smaller dispersion. Based on the analysis the authors think the event a man-made event.
On Nov.14-15, 2001, Kashi seismostation in Xinjiang, China, recorded 86 vibrations (named as "bizarre earthquake swarms" event). In order to recognize their character, the authors made a comparison research on the features of waves between the event and the tectonic earthquakes that occurred in the same area using wave spectrum analysis and polarization analysis. It is found that (1) the full wave train of "earthquake swarms" attenuated much more quickly than that of the tectonic earthquakes; (2) the velocity spectra of "earthquake swarms" are centralized, while those of the tectonic earthquakes are relatively divergent; (3) the corner frequency and predominant frequency of "earthquake swarms" are above two times of those of the tectonic earthquakes, and with smaller dispersion. Based on the analysis the authors think the event a man-made event.
引文
[1]F.谢尔鲍姆,J.约翰逊著.地震数字信号处理——基本原理及应用软件[M].朱元清译.北京:地震出版社,1998.
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[3]陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版社,2000.
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[9]冯德益.地震波理论与应用[M].北京:地震出版社,1988
[2]吴忠良,陈运泰,牟其铎.核爆炸地震学概要[M].北京:地震出版社,1994.
[3]陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版社,2000.
[4]郑治真.波谱分析基础[M].北京:地震出版社,1983.
[5]张少泉,徐子君,何建树,等.地震波分析与应用[M].北京:地震出版社,1998.
[6]许健生,尹志文.地震与爆破的波谱差异[J].地震地磁观测与研究,1999,20(3):18-23.
[7]冯德益,陈化然,丁伟国.大震前地震波频谱异常特征的研究[J].地震研究,1994,17(4):319-329.
[8]郑治真,朱传镇,胡祚春.爆破与地震的差异[J].地球物理学报,1975,18(3):208-216.
[9]冯德益.地震波理论与应用[M].北京:地震出版社,1988
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