澜沧—耿马地震近场井孔水位短临微动态异常研究

本文对澜沧—耿马大震周围井孔水位记录曲线及数据进行了有关处理和分析,结果认为:①思茅井、景谷井水位微形态有四种类型,其中阶变形态和不规则形态有一定前兆意义;②水位后半日波峰时变化对大震有异常反映,波幅异常意义较小;③大震前近场井水位潮汐波因子有较明显的异常。

A STUDY ON THE SHORT-IMMINENT MICRODYNAMIC ANOMALIES OF NEAR-FIELD WATER LEVEL IN WELLS DURING LANCANG-GENGMA EARTHQUAKE

In this paper, the recorded water level curve and data in wells around the epicentral area of Lancang-Gengma earthquake have been processed and analysed. The obtained results show that. ( 1 ) The microdynamic water level shape features 4 different types in Simao and Jinggu wells, in which the step shape and irregular ihape indicate a precursory significance to some extent; (2 ) The later half-day peak time variations of water level characterize anomalously with large earthquakes, whereas the amplitude shows less anomalous significance; and ( 3 ) The tidal wave factor of near-field water level ?before large earthquakes demonstrates comparatively obvious anomalies.