海河隐伏活断层探测中土壤气氡和气汞测量及其结果
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摘要
在海河隐伏断裂的探测中,利用FD-3017RaA测氡仪和XG-4型测汞仪开展了土壤气氡和土壤气汞的测量工作。根据12条断层气测线的测量结果,结合人工地震探测资料,对断层气异常位置与断层位置的关系进行了分析;运用断层气异常强度与断层活动性的关系对海河断裂的活动性进行了研究,给出了海河断裂天津段的位置和活动性分段。研究结果表明,断层气方法不仅能给出断层的初步位置,而且能够用于断层的活动性初步分段,但断层气方法所给出的断层位置应是一个条带。经与人工地震探测结果对比分析,断裂位于这个条带内;根据土壤气氡测量结果,可将海河断裂分为东、西两段,且东段的活动性要强于西段。这种强、弱之分仅是一种相对结果,在判定断层是否为活断层方面还存在一定困难。
In the exploration of the Haihe hidden fault,radon and mercury in soil gas were measured by using FG-3017 radon detector and XG-4 mercury analyzer.In this paper,based on the measurement results of 12 fault gas profiles,and integrating with the exploration results of artificial earthquake method,the relationship between anomalous site of fault gas and fault location is analyzed.Using the relationship between anomalous strength of fault gas and fault activity,the activity of Haihe Fault is studied,thus the location and activity segmentation of the Haihe Fault in Tianjin region are presented.This study shows that the method of fault gas detection can not only identify the preliminary location of fault,but also make preliminary segmentation of fault activity.The fault detected by the method of fault gas is shown as a band.Through contrasting with exploration results of artificial earthquake method and analyzing,the fault locates inside the band.According to the measurement result of soil gas radon,the Haihe Fault can be divided into east and west segments.At the same time,the activity of the east segment of Haihe Fault is stronger than that of the west segment.This is only a relative result,and it is difficult to judge whether the fault is active or not with this result.
In the exploration of the Haihe hidden fault,radon and mercury in soil gas were measured by using FG-3017 radon detector and XG-4 mercury analyzer.In this paper,based on the measurement results of 12 fault gas profiles,and integrating with the exploration results of artificial earthquake method,the relationship between anomalous site of fault gas and fault location is analyzed.Using the relationship between anomalous strength of fault gas and fault activity,the activity of Haihe Fault is studied,thus the location and activity segmentation of the Haihe Fault in Tianjin region are presented.This study shows that the method of fault gas detection can not only identify the preliminary location of fault,but also make preliminary segmentation of fault activity.The fault detected by the method of fault gas is shown as a band.Through contrasting with exploration results of artificial earthquake method and analyzing,the fault locates inside the band.According to the measurement result of soil gas radon,the Haihe Fault can be divided into east and west segments.At the same time,the activity of the east segment of Haihe Fault is stronger than that of the west segment.This is only a relative result,and it is difficult to judge whether the fault is active or not with this result.
引文
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姜大庸,阎贤臣.1990.海原活动断裂流体地球化学场初探[J].地震地质,12(1):63—68.JIANG Da-yong,YAN Xian-chen.1990.Preliminary study of fluid geochemical field on Haiyuan active fault[J].Seismology and Geology,12(1):63—68(in Chinese).
孟广魁,何开明,班铁,等.1997.氡、汞测量用于断裂活动性和分段的研究[J].中国地震,13(1):43—51.MENG Guang-kui,HE Kai-ming,BAN Tie,et al.1997.Study on activity and segmentation of active fault using meas-urement of radon and mercury gases[J].Earthquake Research in China,13(1):43—51(in Chinese).
苏鹤军,张慧,刘旭宙.2005.兰州刘家堡隐伏断层的地球化学探测方法试验[J].高原地震,17(1):9—16.SU He-jun,ZHANG Hui,LIU Xu-zhou.2005.Experiment of Geochemical Method for Detecting Liujiapu Buried Faultin Lanzhou City[J].Earthquake Research in Plateau,17(1):9—16(in Chinese).
汪成民,陈建民,宇文欣,等.1988.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,4(3):173—181.WANG Cheng-min,CHEN Jian-min,YUWEN Xin,et al.1988.A study on microdynamic state of groundfluid and leak-age of fault gas along Yishu fault zone[J].Earthquake Research in China,4(3):173—181(in Chinese).
汪成民,宇文欣,周旭明,等.1989.从断层气测量结果看德都地震[J].中国地震,5(3):57—61.WANG Cheng-min,YUWEN Xin,ZHOU Xu-ming,et al.1989.Understanding the Dedu earthquake based on the re-sults of fault gas measurement[J].Earthquake Research in China,5(3):57—61(in Chinese).
王基华,王亮,孙凤鸣,等.1994.隐伏断层性状的汞地球化学标志研究[J].中国地震,10(2):112—122.WANG Ji-hua,WANG Liang,SUN Feng-ming,et al.1994.A study on mercury-geochemistry indicators of buriedfault s characters[J].Earthquake Research in China,10(2):112—122(in Chinese).
王基华,王亮,孙凤鸣,等.1996.隐伏断裂活动性分段汞的地球化学标志初探[J].地震地质,18(4):409—412.WANG Ji-hua,WANG Liang,SUN Feng-ming,et al.1996.Preliminary discussion on geochemical indicator of mercuryfor the segmentation of active hidden fault[J].Seismology and Geology,18(4):409—412(in Chinese).
阎贤臣,张增,王长岭.1987.活断层上覆土壤中气体成份特征[J].中国地震,3(4):52—59.YAN Xian-chen,ZHANG Zeng,WANG Chang-ling.1987.Characteristics of gas components in the overlying soil onactive faults[J].Earthquake Research in China,3(4):52—59(in Chinese).
朱自强,汪成民,宇文欣,等.1990.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,10(4):75—80.ZHU Zi-qiang,WANG Cheng-min,YUWEN Xin,et al.1990.Preliminary analysis on the field measured result of thefault gas in the Datong-YanggaoMS6.1earthquake[J].Earthquake,10(4):75—80(in Chinese).
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