固原硝口温泉CO_2气体异常与映震效应  

Reflecting earthquake effectivity of the CO_2 anomalies at Xiaokou hot spring in Guyuan county

作　　者：司学芸[1] 李英[1] 姚琳[1] 

机构地区：[1]宁夏回族自治区地震局,中国银川750001

出　　处：《地震地磁观测与研究》2011年第3期88-94,共7页Seismological and Geomagnetic Observation and Research

基　　金：2009年度中国地震局震情跟踪合同制定向工作任务:固原硝口水化观测和分析预测研究;任务批准号:2009020801

摘　　要：对2008年固原硝口CO_2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。The earthquakes and the CO2 anomalies observed at Xiaokou hot spring in Guyuan county, Ningxia Hui Autonomous Region, Northwestern China were correlated by systematically an- alyzing the data of COt concentration, atmospheric temperature, precipitation and exploita tion 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 earth- quake of Ms≥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＂.

关 键 词：固原硝口 CO2气体 汶川地震 异常判定标准 

分 类 号：P315.723[天文地球—地震学]