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地震
张北6.2级地震近震区前兆异常特征及时空演化研究
张永仙, 刘桂萍
Study on eharacteristics of anomalies near by epicenter of Zhangbei MS6.2earthquake and their spatial and temporal evolution
ZHANG Yong-xian, LIU Gui-Ping
地震 . 2000, (1): 53 -58 .