摘要
20 0 0年 6月 2 5日在唐山市古冶发生 ML4.4地震。此次地震前唐山老震区 4级地震平静 1 3个月 ,频度、b值、缺震曲线、η值均出现一定程度异常 ,特别是 6月 1 5日在陡河附近发生了一次小震群 ,最大震级为 3.4级 ,还出现了承德地倾斜、宽城地倾斜、玉田深井水位、河间马 1 7深井水位等短临前兆异常。为此 。
A M L4.4 earthquake occurred in Guye of Tangshan area in Jun 25,2000.The seismicity over 4 magnitude has been quiet for 13 months before the event. The frequency,b value,earthquake absent curve and η value all showed some anomalies.Especially a microearthquake group occurred in the vicinity of Douhe in Jun 15.The largest magnitude is M L3.4. The precusory approaches also showed some imminent anomalies,such as Chengde and Kuancheng ground tilt,Yutian and Hejian Ma-17 wells' underground water level.Based on those anomalies,Center for Analysis and prediction of Seismological Bureau of Hebei Province predicted the event accurately.
出处
《华北地震科学》
2000年第4期53-57,共5页
North China Earthquake Sciences
