地震研究

对瑞昌—武宁断裂带瑞昌段进行了跨断层气体地球化学流动测量,测定了断裂带土壤气Rn和CO2浓度,分析了该断裂带的气体地球化学特征,结合赣南地区b值讨论了断裂带气体分布特征与构造活动性的可能关系。结果显示:桂林桥、伍家畈土壤气Rn和CO2浓度均表现出强正相关特征,说明断裂带Rn是基于CO2载气运移至地表浅层。Rn和CO2浓度峰值均出现在断裂带附近,桂林桥测线中部土壤气浓度明显高于两端,而伍家畈测线中部与两端浓度平均值相对接近,这种浓度空间释放特征的差异可能主要是震后断裂带愈合程度不一所致。两条测线土壤气Rn浓度水平较高,b值扫描发现研究区应力呈增强趋势,表明断裂带活动性较强,可能意示土壤气Rn浓度与断裂带的活动性有着密切的联系。

Based on the distribution of the concentration of the soil gas Rn and CO2 in the Ruichang-Wuning Active Fault Zone obtained by cross-fault observation in the field,we analyze the geochemical characteristics of Rn and CO2 in the Fault Zone,and reveal the relationship between the geochemical characteristics of the two soil gases and the Fault Zone.The results show that the strong correlation of Rn and CO2 concentration indicates that in the Fault Zone Rn migrates to the shallow surface along with CO2.The peak concentrations of Rn and CO2 soil appear near the Fault Zone.The concentration of Rn and CO2 in the middle of the Guilinqiao survery line is obviously higher than that at both ends of the line,while the average concentrations in the middle and both ends of the Wujiafan survey line are relatively close.The concentrations differ spatially mainly because of the different degrees of fault healing after the earthquake.The concentration of Rn in both the two survey lines is high,and the b-value scanning shows that the stress in the study area is increasing,indicating that the Fault activity is strong.This suggests that the concentration of Rn is closely related to the activity of the Ruichang-Wuning Active Fault Zone.

引言
1 研究区概况
2 布线和测量方法
3 测量结果
4 讨论
5 结论

图1 九江—瑞昌地区地质构造及测线分布概况(据曾新福等,2016)<br/>Fig.1 Geological structures and two survey lines in Jiujiang-Ruichang area(according to Zeng et al,2016)

图1 九江—瑞昌地区地质构造及测线分布概况(据曾新福等,2016)
Fig.1 Geological structures and two survey lines in Jiujiang-Ruichang area(according to Zeng et al,2016)

图2 土壤气测量示意图<br/>Fig.2 Schematic diagram of soil gas measurement

图2 土壤气测量示意图
Fig.2 Schematic diagram of soil gas measurement

表1 研究区土壤气Rn、CO2地球化学背景测量结果<br/>Tab.1 Geochemical background values of Rn and CO2 in the study area

表1 研究区土壤气Rn、CO2地球化学背景测量结果
Tab.1 Geochemical background values of Rn and CO2 in the study area

图3 桂林桥(a)和伍家畈(b)测线断裂带Rn、CO2浓度测值及其相关性<br/>Fig.3 The measured values and relationships between Rn and CO2 concentrations along Guilinqiao survery line(a)and Wujiafan survery line(b)

图3 桂林桥(a)和伍家畈(b)测线断裂带Rn、CO2浓度测值及其相关性
Fig.3 The measured values and relationships between Rn and CO2 concentrations along Guilinqiao survery line(a)and Wujiafan survery line(b)

图4 赣北地区b值空间分布<br/>Fig.4 Spatial distribution of b-value in North Jiangxi Province

图4 赣北地区b值空间分布
Fig.4 Spatial distribution of b-value in North Jiangxi Province

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备注

引言

1 研究区概况

2 布线和测量方法

3 测量结果

4 讨论

5 结论

期刊信息