【摘要】 分析了1990年4月26日青海共和7.0级地震、2000年9月12日青海兴海6.6级地震、2001年11月14日昆仑山口西8.0级地震和2008年5月12日四川汶川8.0级地震前青海、甘肃以及四川北部地区部分水氡观测点的资料变化情况,发现这些测点的观测资料存在同步或准同步的变化,而且变化时间早,持续时间长。共和地震前,距震中越近的测点,出现的趋势性异常所占的比例越高,异常时间越早。昆仑山口西地震的异常持续时间更长,多数异常点距震中更远。随着时间的推移,异常点从西北向东南迁移。兴海地震个别测点出现异常。汶川地震的异常的同步性更好,而且多数测点的同震效应非常明显。这些地震的异常的恢复时间均无明显的规律,有些是在地震前恢复,有些是在地震后恢复。更多还原

【Abstract】 The data of water radon from several seismic stations in Qinghai,Gansu and northern Sichuan is analyzed before MS7.0 Gonghe,Qinghai earthquake,MS6.6 Xinghai,Qinghai earthquake,west Kunlun Mountains MS8.0 earthquake and MS8.0 Wenchuan,Sichuan earthquake.The synchronous and quasi-synchronous anomalies of water radon appeared early in the seismogenic process of these earthquakes.The nearer the stations are to the Gonghe earthquake,the higher the ratio of the trend anomaly is,and the earlier the anomaly appears.For the MS8.0 Kunlun Mountains earthquake,most of the anomalous points are distant and the anomalies last very long.The anomalous points migrate from the Northwest to the Southeast.For Xinghai earthquake,a few anomalies appear before the earthquake.For Wenchuan earthquake,the anomalies have a good synchrony and most of the anomalies have a good co-seismic effect.For all the earthquakes,the time the anomalies disappear is not definite;some of the anomalies disappear before the earthquake,some of the anomalies disappear after the earthquake.更多还原