地震地球化学某些前兆机理的模拟实验研究

本文通过氡射气性能的压力实验,氡射气分配系数实验和岩石的溶滤实验等,对地下水氡及其它地震地球化学前兆机理进行了探讨。实验表明:氡射气的最高值发生在岩石严重破裂时;岩石射气性能高低与其本身的铀含量成正比;岩石在压力作用下射出的氡气在水中的分配大于在气相中的分配;岩石在饱和CO_2水中和压力作用下的溶滤程度要比在纯蒸馏水中和常压下大得多。因此,地震前地下水氡浓度和水中离子组分和气体组分会出现异常变化,而这种变化既与应力作用有关,又与地球内部水-气-岩系统在地震孕育过程中的物理化学作用有关

EXPERIMENTAL STUDIES ON RESPONSIBLE MECHANISMS FOR RADON AND SOME GEOCHEMICAL PRECURSORS

To better understand the mechanism responsible for groundwater radon anomalies and other seismo-geochemical precursors, the following modeling experiments have been carried out: 1) measurements of Rn emitted from rocks with various uranium concentration during stress loading and rupture of rocks; 2) determination of the coefficient of distribution of emitted radon in CO_2 saturated water and gas under pressure; 3) leaching experiment with rock samples in pure and CO_2-saturated distilled water under atmosphere and stress loading, respectively.It can be seen from the preliminary results that the maximal Rn concentration was recorded when the rupture of the rocks occurred; Rn emitted from the rock was proportional to the uranium content in the rock; Rn emitted from the rock was distributed somewhat more in water than in gas; and the leaching of rocks may prefer CO_2-saturated water under stress loading to distilled water under atmosphere.Therefore, it is reasonable to see some anomalous changes in Rn concentration and other ionic and gaseous components prior to a few strong earthquakes. Meanwhile, the preliminary results of the experiments indicate that the seismo-geochemical anomalies appear to be related to both the stress variation and the physico-chemical processes involved in the water-gas-rock equilibrium system within the earth preceding an impending earthquake