甘肃玉门5.9级地震前周至数字化综合观测井的异常特征

CHARACTERISTICS OF GROUNDWATER ANOMALIES OBSERVED IN ZHOUZHI DIGITAL OBSERVATION WELL BEFORE YUMEN M5.9 EARTHQUAKE IN GANSU

摘要: 2002年12月14日,甘肃玉门发生5.9级地震,震前,距离震中1000km的周至地震台地下水数字化综合观测井的地热、水位、流量三个测项都出现了明显的短临异常显示。本文介绍了震前周至井出现的短临异常变化。与该台历史手工观测结果对比,数字化观测更有利于捕捉短临前兆信息及其变化的完整过程。

Abstract: Yumen M5.9 earthquake occurred in Dec.14, 2002. Before the event, the water temperature, water level and outflow of Zhouzhi well, which is 1000km away from the epicenter, all showed clear short-term and imminent anomalies. The variation of these anomalies is introduced here. Compared with the historical analogue data of the station, the digital observation is more propitious to detecting short-term and imminent precursors as well as its whole variation.