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Moderate and strong earthquoke and it magnetic anomaly in liaoning province

Shun Tao Zhang Gui Lin (Liaoning seismological Bureau Shenyang 110031) Wang Qing Zhi Wang Bo Yu shi chang shi shujuang (Liaozhong seismological station,Liaozhong 110200)  
Re-examining the short-term and imminent precusory anomalies prior to Haicheng (1975 M=7.3),Yingkou(1978 M=5.9) and Zhangwu(1988 M=4.8),the authors suggest that the short-term and imininent precursory anomalies prior to moderate-strong earthquake occurring in and near liaoning province be characterized by ①anomalous lasting thme greater than sercral months;②anomalous range greater than 5nT;③the leisfance between the anomolous sites to epicenter less than 250KM;④due to the sparsely-distributed obser vation stations and seismo-magnetic effect belonging to weaak wagnetism,once one or two stations develop anomalies it showld be paid mare attention to combined with other precursory anomalies synthetic judge should be wade.
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