乌拉特前旗4.8级地震前乌加河地震台定点形变短临异常分析

Analysis to the imminent anomalies observed in Wujiahe deformation station before the M4.8 earthquake of Wulateqianqi

2 0 0 1年 6月 5日乌拉特前旗发生 4.8级地震 ,震中距乌加河台南东 80 km,震前乌加河台形变出现短临异常显示 ,震前 1～ 3日观测值超出正常日变值 2倍以上 ,观测人员及时反馈信息 ,及时跟踪通报异常信息 ,应用系统前兆计算方法滤波、速率检验 ,该台资料对此地震映震效果较好。本文着重讨论震前出现的短临异常信息。

some imminent anomalies appeared at Wujiahe crustal deformation station before the M 4.8 earthquake in Wulateqianqi on June 5,2001. The epicenter is 80 kilometers from the station in southeast.From the first days to the third day before the earthquake the observing value exceed 3 times of the normal value.The anomalies were tracked and reported in time.Processed With filtering and rate checking,the data of the station show a good effect in reflecting earthquake.The imminent anomalies before the earthquake is mainly discussed in this paper.