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| 唐山断裂带南西段和北东段土壤气Rn和CO2浓度特征 | |
| 引用本文： | 杨江,李营,陈志,孙凤霞,赵建明,李静,王江.唐山断裂带南西段和北东段土壤气Rn和CO2浓度特征[J].地震,2019,39(3):61-70. |
| 作者姓名： | 杨江 李营 陈志 孙凤霞 赵建明 李静 王江 |
| 作者单位： | 中国地震局地震预测重点实验室,北京,100036;河北省地震局唐山中心台,河北唐山,063021;防灾科技学院,河北三河,065201;河北省地震局监测网络中心,石家庄,050021 |
| 基金项目： | 国家自然科学基金项目“唐山断裂带逸出气体Rn、 He、 CO2地球化学特征及其成因的实验研究”(41573121); 中国地震局地震预测研究所基本科研业务专项“首都圈土壤气体地球化学观测研究”(2017IES0303); 国家自然科学基金项目“北天山泥火山区CH4排放通量及其对大气的贡献率”(41402298); 中国地震局地震预测研究所基本科研业务专项“北天山地区泥火山流体地球化学研究”(2015IES0401)。 |
| 摘 要： | 本文通过测量唐山断裂带南西段王兰庄和北东段巍峰山的土壤气Rn和CO2浓度, 探讨了Rn和CO2浓度的空间分布特征及其与断裂活动的关系。 测量结果显示, 王兰庄剖面和巍峰山剖面土壤气Rn浓度范围分别为691~57 671 Bq/m3和471~32 739 Bq/m3, CO2浓度范围分别为0.17%~7.21%和0.08%~1.71%。 两个剖面Rn和CO2浓度均高于区域背景值, 这与唐山断裂带断层的开放状态有关。 Rn和CO2释放强度(KQ)在王兰庄剖面分别为2.90和4.04, 在巍峰山剖面释放强度分别为0.90和0.99。 王兰庄剖面测线中部土壤气浓度明显高于两端, 而巍峰山剖面测线中部与两端浓度平均值相近, 这种浓度空间分布特征的差异主要是断层破碎程度不同所致。 巍峰山剖面土壤气Rn浓度水平较高, 地球物理学研究发现此区域应力值高, 断层活动性较强, 表明土壤气Rn浓度与断层活动性有着密切的关系。 |
| 关 键 词： | 唐山断裂带 土壤气 Rn和CO2 地球化学 活动断层 |
| 收稿时间： | 2017-09-01 |
Geochemical Characteristics of Soil Gas in the South-west and North-east Segments of the Tangshan Fault Zone,Northern China |
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| YANG Jiang,LI Ying,CHEN Zhi,SUN Feng-xia,ZHAO Jian-ming,LI Jing,WANG Jiang.Geochemical Characteristics of Soil Gas in the South-west and North-east Segments of the Tangshan Fault Zone,Northern China[J].Earthquake,2019,39(3):61-70. | |
| Authors: | YANG Jiang LI Ying CHEN Zhi SUN Feng-xia ZHAO Jian-ming LI Jing WANG Jiang |
| Institution: | 1.CEA Key Laboratory of Earthquake Prediction Institute of Earthquake Science, CEA, Beijing 100036, China; 2.Tangshan Earthquake Station of Earthquake Administration of Hebei Province, Tangshan,Hebei 063021, China; 3. Institute of disaster prevention, Sanhe 065201, China; 4.Monitoring Network Center of Earthquake Administration of Hebei Province, Shijiazhuang 050021, China |
| Abstract: | We discussed the geochemical characteristics of soil gas Rn and CO2 concentration and the correlation between the spatial variation of soil gas and tectonic activity, based on the measurements of Rn and CO2 concentrations in the south-west (Wanglanzhuang) and north-east (Weifengshan) segments of the Tangshan fault zone. The results show that the concentration range of Rn in Wanglanzhuang and Weifengshan are respectively 691 to 57671 Bq/m3 and 471 to 32739 Bq/m3, while the concentration range of CO2 are respectively 0.17 to 7.21% and 0.08 to 1.71%. The concentrations in these two profiles are higher than the regional background values, which may be caused by the open state of fault in the Tangshan area. The release intensity (KQ) of soil gas in these two profiles is different. KQ of Rn and CO2 is 2.90 and 4.04 respectively in Wanglanzhuang Profile, and is 0.90、0.99 respectively in Weifengshan Profile. This illustrates that the concentration in the middle part of Weifengshan Profile is much higher than that at the both ends, while in Weifengshan Profile, the concentration of each part is consistent. The soil gas geochemical results show that the variations of soil gas spatial distribution may be attributed to the different degree of fault fragmentation in the profiles. The higher the regional stress, the higher the fault activity and the concentrations of Rn in Weifengshan Profile. This indicates that the concentration of Rn is closely related to the activity of faults. |
| Keywords: | Tangshan fault Soil gas Rn and CO2 Geochemistry Active fault |
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