【摘要】 对2008年固原硝口CO₂气体测值异常和整体变化的不稳定因素进行分析,从气温、降雨、仪器和人为因素等方面排除干扰,认为2008年汶川8.0级地震前后出现的短期异常真实可靠。对距今18年的观测资料进行异常统计,发现18次异常中有6次较好对应周围M_S≥4.9地震。结果发现,该测项短期异常具有短期趋势性下降—转折上升和多次单点突升（超出2.5倍均方差的高值）的特点。更多还原

【Abstract】 The earthquakes and the CO₂ anomalies observed at Xiaokou hot spring in Guyuan county, Ningxia Hui Autonomous Region,Northwestern China were correlated by systematically analyzing the data of CO₂ concentration,atmospheric temperature,precipitation and exploitation of the hot spring water.The data of CO₂ concentrations of hot spring gas measured daily for 18 years showed 15 obvious anomalies.Six of the anomalies may be related to the earthquake of M_s≥4.9,which indicated that statistically,40% of the observed CO₂ anomalies might be caused by seismic activity.The anomaly occurred from 22 December 2007 to 22 May 2008 was well corresponding to the Wenchuan earthquake on 12 May 2008.The criteria for identifying the CO₂ anomaly related to earthquake were proposed to be "transition from increase to decrease and multiple pulses".更多还原