【摘要】 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更多还原

【Abstract】 The observed values of radon concentration in gas from Babaoshan fault zone, western Beijing through May 1992 to December 1996 are given in the paper, and the factors influencing the radon anomalies and the correlation between the anomalies and earthquakes are discussed. The measurements of radon concentration at 2 measurement positions (“a” and “b”) vary greatly, and the discreteness of radon concentration at “a” point is relatively larger than that at “b” point. The mean value of radon concentration at “a” point is 6.5 Bq/L with a square root error of 2.3, while the mean value and the square root error at “b” point are 4.4 and 1.6 Bq/L, respectively.Both the annual episodic changes of the radon concentration and the annual periodic fluctuations of the atmospheric temperature and pressure and earth temperature at the depth of 3.2 m exist. The temperature and humidity of soil are considered to be the main factor dominating the annual episodic changes of radon concentration. The radon concentration change is relatively small when no earthquake occurs, but it rapid increases before and after earthquakes. Thirteen earthquakes (M L ≥4.0) occurred in Beijing and its neighbouring area from 1992 to 1996 and 10 of them occurred in the period of November 1992 to December 1996.Radon concentration anomaly occurred before and after 7 earthquakes, but two radon anomalies did not associate with any earthquake, and 3 earthquakes did not show radon anomaly. The distance between the measurement position and the epicenter of earthquake associated with radon concentration anomaly is relatively larger in the NE-SW direction, since the measurement positions are situated in the western edge of the continental rift. Data show that escaped radon from the fault zone plays an important role in earthquake monitoring and prediction.更多还原