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观测地下水中氡含量的变化,作为地震予报的一种前兆手 段,已得到地震学界越来越多的人重视.继一九六六年苏联塔什干地震发现震前地下水中氧含量有明显的升高后,我国近些年发生的强震,也证实了震前地下水中的氡含量,不但有趋势性异常,而且有短期的突跳异常.国内利用人工爆破的机会,观测爆破后短时间内地下水中氡含量的变化,得到明显的脉冲式的异常效应.岩石样品的加压实验,样品中若含铀钍矿物较多,样品破裂逸出较多的氡气,数值可达样品未破裂前的几倍.作抽水、注水、注浓度较高的含氡水试验,观测水中氡含量的变化,得到明显的对应关系.上述事实说明,地下水中氡含量的变化,可以敏感地反映介质应力状态的变化.同时地下水状态的变化,也可以影响其氡含量的变化.
Observing the change of groundwater radon content as a precursor to earthquakes reporting has gained more and more attention from the seismological community.According to the Tashkent earthquake in 1966 in the Soviet Union, the oxygen content in groundwater was significantly increased High, the strong earthquakes occurred in recent years in China also confirmed the groundwater radon content before the earthquake, not only the trend of anomalies, but also short-term sudden jump anomaly. The use of artificial blasting opportunities in China, after a short period of observation blasting Groundwater radon content changes, the obvious pulse-like anomalous effect.Experimental test of rock samples, if the samples contain more uranium and thorium minerals, sample rupture to escape more radon, the sample up to the value before the rupture .For the pumping, water injection, injection concentration of radon-containing water test, observation radon content in water changes, Obtained a clear correspondence between the above facts show that groundwater radon content can be sensitive to reflect the stress state of the medium The change of groundwater status can also affect the change of radon content.