天津地区断层气方法应用中的两个问题
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摘要
运用海河断裂、沧东断裂、天津北断裂和天津南断裂断层气测量结果,同时结合人工地震探测结果,讨论了土壤气氡异常位置与断层上断点位置的关系和土壤氡背景场与背景值的问题。研究结果表明,覆盖层的厚度对土壤气氡异常的位置存在一定影响,覆盖浅的断层,断层气异常一般在断层上断点的上方;覆盖厚的断层,断层气异常往往与断层位置不一致,至少存在60 m左右的误差,说明断层气异常存在偏离断层的情况。从偏移距离以及异常位于断层的上盘或下盘上看,未发现有统计上的关系。在土壤气氡测量结果的异常确定上,以每条测线的相对高值判定异常为宜,不宜使用统一的背景场来确定异常。
By using the observational results of fault gas of Haihe fault,Cangdong fault,Tianjin north fault and Tianjin south fault in this paper,and by integrating with the survey results of artificial seismic method,the authors studied the problems of the relationship between anomalous site of soil radon and the depth of upper breaking point of fault,and the problem of the background field and background value.The results show that the overburden thickness has a certain influence to anomalous position of soil radon.In the area of the shallow overburden,the anomalies of soil gas radon are usual on the upper end of fault,and in the area of the thick overburden,the anomalous position of soil gas radon is not consistent with fault position.The anomalies position of soil gas radon deviates from the fault position at least 60m or so.In the aspect about the deviating distance and anomalous position,which is located in top wall or bottom wall of fault,we do not discover their statistical relation.In the aspect about the anomalous determination of soil gas,it is suitable by using the relatively high values of each profiles,rather than using the determination anomaly based on the background field.
By using the observational results of fault gas of Haihe fault,Cangdong fault,Tianjin north fault and Tianjin south fault in this paper,and by integrating with the survey results of artificial seismic method,the authors studied the problems of the relationship between anomalous site of soil radon and the depth of upper breaking point of fault,and the problem of the background field and background value.The results show that the overburden thickness has a certain influence to anomalous position of soil radon.In the area of the shallow overburden,the anomalies of soil gas radon are usual on the upper end of fault,and in the area of the thick overburden,the anomalous position of soil gas radon is not consistent with fault position.The anomalies position of soil gas radon deviates from the fault position at least 60m or so.In the aspect about the deviating distance and anomalous position,which is located in top wall or bottom wall of fault,we do not discover their statistical relation.In the aspect about the anomalous determination of soil gas,it is suitable by using the relatively high values of each profiles,rather than using the determination anomaly based on the background field.
引文
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[2]阎贤臣,张增,王长岭.活断层上覆土壤中气体成份特征[J].中国地震,1987,3(4):52-59.
[3]汪成民,陈建民,宇文欣,等.沂沐断裂带地下流体微动态与断层溢出气的研究[J].中国地震,1988,4(3):173-181.
[4]姜大庸,阎贤臣.海原活动断裂流体地球化学场初探[J].地震地质,1990,12(1):63-68.
[5]朱自强,汪成民,宇文欣,等.大同-阳高6.1级地震现场断层气测量结果初步分析[J].地震,1990,10(4):75-80.
[6]王华林,李家灵,许坤福,等.平原地区活断层研究[J].地震研究,1991,14(2):132-140.
[7]孟广魁,何开明,班铁,等.氡、汞测量用于断裂活动性和分段的研究[J].中国地震,1997,13(1):43-51.
[8]张新基,张慧,苏鹤军,等.刘家堡活动断层土壤气氡、汞地球化学特征[J].地震,2005,25(4):87-92.
[9]候彦珍,王永才,张根深.土壤气氡测量影响因素的初步研究[J].华北地震科学,1994,12(2):55-59.
[10]陈宇坤,任峰,张翠芬,等.天津海河隐伏断裂的晚第四纪活动特征研究[J].地震地质,2004,26(1):111-121.
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