新疆喀什地区1996年11月震前超低频电磁辐射异常与震源方向的关系

RELATIONSHIP BETWEEN ABNORMAL ULF ELECTROMAGNETIC EMISSION AND THE DIRECTION OF SOURCES BEFORE EARTHQUAKES IN KASHI REGION OF XINJIANG IN NOVEMBER, 1996

研究了 1 996年 1 1月 1 9— 2 7日在新疆喀什地区连续发生 6次 4 5级以上地震前记录到的超低频电磁辐射异常现象的偏振特性 ,发现震前记录到的该异常用 0 0 8— 0 1 6Hz的带通滤波器滤波后 ,水平磁场分量的偏振近似为线偏振 ,且震前 1天的偏振主轴方向日均值与喀什台到强震震源的方向之间有近乎垂直的关系 .

In this paper the polarization characteristics of abnormal ULF electromagnetic emissions before each of 6 earthquakes taking place at Kashi region of Xinjiang from Nov. 17 to 29 in 1996 are studied. It is found that the polarizations of abnormal ULF electromagnetic emissions recorded before earthquake are almost linear after band-pass filter with frequency range of 0 08-0 16Hz. The direction of earthquake source is almost perpendicular to the diurnal average azimuth of major polarization axis in one day before each earthquake.