摘要
应用地震波波形时间线性度方法 ,对安徽及邻区二次中强震前后及近 8年来本省多台地震波资料 ,进行了时间线性度 r值及其初始部分振动的平均半周期 Th 值分析研究。结果认为 :1本省及邻近区域中强震前 ,震中一定范围内存在着 r值和 Th 值低值异常现象 ,异常持续时间一般在 4～ 1 2个月 ,异常恢复后至主震发生时间一般在 0～ 1 2个月内 ;2震前 r值和 Th值的异常变化 。
Using the temporal linearity method of seismic wave form,the temporal linearity( r value)of wave form of initial part of P wave in a lot of stations and its average half period( T h value)are studied for the data recorded before and after two moderate and strong earthquakes occurred in Anhui province and its neighboring area and for that in recent 8 years in Anhui Province.The result indicates:1.The low value anomaly of r value and T h valve are found inside certain region from the epicenters before the moderate and strong earthquakes occurred in Anhui Province and its neighboring area.The general anomalous time is 4～12 monthes.The time between anomaly return and major earthquake occurrence is in 0～12 monthes;2.The anomaly of r value and T h value before earthquake occurrence acturally reflected the variation of the regional stress field.
出处
《地震地磁观测与研究》
2000年第6期49-57,共9页
Seismological and Geomagnetic Observation and Research
关键词
地震波时间线性度
应力场
中强震
中短期预报
temporal linearity of seismic wave form, r value, T h value,the regional stress field,Anhui province and its neighboring areal
