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给出了 1 992年 5月至 1 996年 1 2月八宝山断裂带断层气中氡的浓度实测值 ,并讨论了氡异常的影响因素及其与地震的关系。二个测点断层气中氡的浓度变化范围较大 ,且 a测点的氡浓度值离散度较大 ,其平均值为 6.5Bq/L,均方差为 2 .3,b测点均值为 4.4Bq/L,均方差为1 .6。氡的原始测值具有年变旋回 ,测点气温、气压和 3.2 m地温也具有明显的年变规律。温度和土壤湿度是控制氡浓度年变的主要因素。氡的浓度在无震时变化幅度较小 ,在震前则大幅度增高或降低。 1 992年 1月 1日至 1 996年 1 2月 31日北京及邻近地区发生 4.0级以上 (含 4.0级 )地震共 1 3次 ,而 1 992年 1 1月至 1 996年 1 2月共发生 1 0次地震 ,其中 7次地震震前出现了氡异常。氡有异常而未对应地震仅有 2次 ,有地震而无异常有 3次。八宝山断裂带断层逸出氡异常映震距离具方向性 ,在 NE- SW方向映震距离较大 ,这与测量点位于大陆裂谷西缘有关。资料表明断层逸出氡在地震监测预报中具有重要的作用
The measured values of radon concentration in fault gas from Babaoshan fault zone from May 1992 to January 1996 are given. The influencing factors of radon anomalies and their relations with earthquakes are also discussed. The concentrations of radon in the fault gas of the two measuring points vary greatly, and the radon concentration of the measuring point a has a greater degree of dispersion with an average value of 6.5Bq / L, a mean square deviation of 2.3 and a mean of b of 4.4 Bq / L, the mean square deviation is 1.6. The original measurement of radon has annual gyration, temperature, pressure and temperature of 3.2 m also have obvious annual variation law. Temperature and soil moisture are the main factors controlling the annual variation of radon concentration. The concentration of radon changes less in the absence of earthquake and increases or decreases significantly before the earthquake. From January 1, 1992 to January 31, 1996, earthquakes of magnitude 4.0 and above (including magnitude 4.0) occurred in Beijing and its adjacent areas a total of 13 times, and from January, 1992 to January, 1996 10 earthquakes occurred, of which 7 occurred before the earthquake radon anomalies. There are only 2 earthquakes with anomalies without radon and 3 earthquakes with no anomalies. The fault of the Babaoshan fault fault escaped from the direction of the anomalous mapping distance of radon anomalies, and the reflection distance in the direction of NE-SW was large, which was related to the fact that the measuring point was located on the western margin of the continental rift. The data indicate that radon faulting from faults has an important role in earthquake monitoring and prediction