摘要
利用2018年在唐山断裂带布设的10个土壤气CO_(2)浓度观测点构成的台阵,选取观测资料较好的8个台站进行数据分析处理。结果表明,唐山断裂带土壤气CO_(2)浓度具有夏高冬低的年变规律;唐山断裂带土壤气CO_(2)浓度与地温间具有相关性,当相关系数较大时,土壤气CO_(2)浓度日均值曲线呈平稳型,当相关系数较小时,土壤气CO_(2)浓度日均值曲线呈锯齿型。分析唐山断裂带CO_(2)台阵的映震效果发现,在活动断裂及周边地震的震中区,土壤气CO_(2)浓度日均值存在异常变化,变化幅度与台站位置、对应区域的构造活动等有关,与土壤气CO_(2)浓度、地温间的相关系数大小、曲线是否为平稳型或锯齿型关系不密切。总体上,土壤气CO_(2)浓度对唐山地区M_(L)3.0以上地震有一定映震效果。
Using the platform array composed of 10 soil gas CO_(2) concentration observation points set up in the Tangshan fault zone in 2018,8 stations with good observation data were selected for data analysis and processing.The results show that the soil gas CO_(2) concentration in the Tangshan fault zone follows an annual pattern of being higher in summer and lower in winter.There is a correlation between the soil gas CO_(2) concentration in the Tangshan fault zone and ground temperature.When the correlation coefficient is relatively high,the daily mean curve of soil gas CO_(2) remains stable,whereas when the coefficient is low,the curve exhibits a sawtooth pattern.Through analyzing the seismic reflection effects of the CO_(2) network in the Tangshan fault zone,we found that the abnormal changes exist in the daily mean values of soil gas CO_(2) concentration in the epicentral areas of active faults and surrounding earthquakes.The magnitude of this changes is related to the station location,the tectonic activity of the corresponding area,and others.However,these changes do not have a close relationship with the size of the correlation coefficient between soil gas CO_(2) concentration and ground temperature,or whether the curve is stable or sawtooth.Overall,the soil gas CO_(2) concentration has a certain seismic reflection effect on earthquakes in the Tangshan region with a magnitude of M_(L) 3.0 and above.
作者
符泽宇
刘燕翔
李金
王妍
FU Zeyu;LIU Yanxiang;LI Jin;WANG Yan(Tangshan Earthquake Monitoring Center Station,Hebei Province 063021,China)
出处
《地震地磁观测与研究》
2023年第4期85-94,共10页
Seismological and Geomagnetic Observation and Research
基金
中国地震局地震预报专项(项目编号:YBZX-DQHX2018-05)
河北省地震局地震科技星火计划(项目编号:DZ20190423050)。
关键词
唐山断裂带
土壤气CO_(2)
地温
映震
Tangshan fault zone
soil gas CO_(2)
ground temperature
seismic reflection
