汶川地震震后大成都地区断裂带活动性氡气测量分析评价
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摘要
本文运用活动断裂剖面上的土壤氡气浓度测量,对大成都地区断裂的位置、范围和活动性进行监测,监测结果表明汶川地震对大成都地区断裂带有较大的影响。通过对北川断裂虹口剖面、彭灌断裂小渔洞剖面、彭灌断裂中坝剖面、彭灌断裂白鹿剖面以及新津-蒲江断裂剖面进行监测,从测量结果分析可知:断裂剖面土壤氡浓度背景高于无断裂带地区,且受地震影响较大,距汶川地震震中越近,断裂剖面土壤氡浓度值越高;断裂剖面氡浓度异常阈值与背景值之比均不大于3,最大值与背景值之比均小于5。结合测量地点的地形、表层土壤结构等地质条件,对大成都地区震后活动断裂的相对活动性的强弱进行科学评价,认为目前大成都地区并无活动性极强的断裂,且北川断裂与新津-蒲江断裂的活动性高于彭灌断裂。
This paper uses radon concentration measurements on the profile of active fault to assess the position,scope and activity of faults in Chengdu Region.It can be found that Wenchuan Earthquake affected faults strongly.The radon concentrations were monitored on profiles of Beichuan Fault,Pengguan Fault and Xinjin-Pujiang Fault.The results indicate that the background radon concentration on the profile of active faults is higher than other places.The closer r to the epicenter,the higher the value of radon concentration on the profile of active faults.By data processing,the ratios of radon anomaly threshold value to background value of radon concentration are no more than three and the ratios of maximum radon concentration to background value of radon concentration are less than five.Considering the geological conditions of measurement location such as the topography and surface soil structure,the activities of active faults in Chengdu region are evaluated after the earthquake.There is no fault with high level of activity in Chengdu region.Moreover,the activity of Beichuan Fault and Xinjin-Pujiang Fault is higher than that of Pengguan Fault.
This paper uses radon concentration measurements on the profile of active fault to assess the position,scope and activity of faults in Chengdu Region.It can be found that Wenchuan Earthquake affected faults strongly.The radon concentrations were monitored on profiles of Beichuan Fault,Pengguan Fault and Xinjin-Pujiang Fault.The results indicate that the background radon concentration on the profile of active faults is higher than other places.The closer r to the epicenter,the higher the value of radon concentration on the profile of active faults.By data processing,the ratios of radon anomaly threshold value to background value of radon concentration are no more than three and the ratios of maximum radon concentration to background value of radon concentration are less than five.Considering the geological conditions of measurement location such as the topography and surface soil structure,the activities of active faults in Chengdu region are evaluated after the earthquake.There is no fault with high level of activity in Chengdu region.Moreover,the activity of Beichuan Fault and Xinjin-Pujiang Fault is higher than that of Pengguan Fault.
引文
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[8]吴慧山,蒋永一,唐声喤,赵树新.核技术勘查[M].北京:原子能出版社,1998.Wu Huishan,Jiang Yongyi,Tang shenghuang,Zhao Shuxin.Theexploration of nuclear technology.Beijing:Atomic Energy Press,1998.
[9]A.L.Robinson,R.G.Sextro and W.J.Riley.Soil gas entryinto houses driven by atmospheric pressure fluctuations-the influ-ence of soil properties[J].Atmospheric Environment,1997,31(10):1487~1495.
[10]J.Kemski,A.Siehl,et al..Mapping the geogenic radon poten-tial in Germany[J].The Science of the Total Environment,2001,(272):217~230.
[11]董顺利,李勇,乔宝成,马博琳,张毅等.汶川特大地震后成都盆地内隐伏断层活动性分析[J].沉积与特提斯地质,2008,28(3):1~7.Dong Sunli,Li Yong,Qiao Baocheng,Ma Bolin,Zhang Yi.A-nalysis of the newactivity of the buried faults in the Chengdu ba-sin after Wenchuan Earthquak.Sedimentary Geology and TethyanGeolog,2008,28(3):1~7.
[2]李起彤等编著.活断层及其工程评价[M].北京:地震出版社,1991.Li Qitong,et al..Active faulty and its engineering appraise.Bei-jing:Earthquake Press,1991.
[3]R.B.Mosley,M.Y.Menetrez.The influences of diffusion andadvective flow on the distribution of radon activity within USEPA’s soil chamber[J].Environment International,2002,22(Suppl.1):521~533.
[4]李勇,孙爱珍.龙门山造山带构造地层学研究[J].地层学杂志,2000,24(3):201~206.Li Yong,Sun Aizhen.Tectostratigraphy of Longmenshan orogen.Journal of Stratigraphy,2000,24(3):201~206.
[5]张骏,高秀君,李侠,等.霍州矿区隐伏断裂(带)活动性氡气测试成果解释分析[J].高原地震,2000,12(1):16~21.Zhang Jun,Gao Xiujun,Li Xia,et al..Explanation and ap-praisement for active faulty by radon measurement.EarthquakeResearch in Plateau,2000,12(1):16~21.
[6]张骏,李西建,邹艳琴,齐朝辉,卢玉东等.北秦岭地带断裂活动性氡气测试成果分析评价[J].工程地质学报,2001,9(1):81~86.Zhang Jun,Gao Xiujun,Li Xia,et al..Analysis and evaluationof radon survey result in relation with faulty activity in NorthernQinling belt.Journal of Engineering Geology,2001,9(1):81~86.
[7]邵永新,杨绪连,李一兵.海河隐伏活断层探测中土壤气氡和气汞测量及其结果[J].地震地质,2007,29(3):627~635.Shao Yongxin,Yangxulian,Li Yibing.The result and measure-ment of soil gas radon and soil gas mercury in the exploration ofHaihe hidden faulty.Seismology and Geology,2007,29(3):627~635.
[8]吴慧山,蒋永一,唐声喤,赵树新.核技术勘查[M].北京:原子能出版社,1998.Wu Huishan,Jiang Yongyi,Tang shenghuang,Zhao Shuxin.Theexploration of nuclear technology.Beijing:Atomic Energy Press,1998.
[9]A.L.Robinson,R.G.Sextro and W.J.Riley.Soil gas entryinto houses driven by atmospheric pressure fluctuations-the influ-ence of soil properties[J].Atmospheric Environment,1997,31(10):1487~1495.
[10]J.Kemski,A.Siehl,et al..Mapping the geogenic radon poten-tial in Germany[J].The Science of the Total Environment,2001,(272):217~230.
[11]董顺利,李勇,乔宝成,马博琳,张毅等.汶川特大地震后成都盆地内隐伏断层活动性分析[J].沉积与特提斯地质,2008,28(3):1~7.Dong Sunli,Li Yong,Qiao Baocheng,Ma Bolin,Zhang Yi.A-nalysis of the newactivity of the buried faults in the Chengdu ba-sin after Wenchuan Earthquak.Sedimentary Geology and TethyanGeolog,2008,28(3):1~7.
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