喀什"奇异震群"与构造地震的对比研究

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

COMPARISON RESEARCH ON "BIZARRE EARTHQUAKE SWARMS" AND TECTONIC EARTHQUAKES IN KASHI

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.