唐山断裂带土壤气地球化学特征分析

由于唐山断裂带土壤气地球化学研究成果相对较少,因此于2017—2018年分3期对唐山断裂带5条分支断裂土壤气浓度（包括Rn、Hg、CO₂）和通量（包括Rn、Hg）进行测量,利用土壤气浓度平均值+2倍均方差的方法确定每条断裂异常限。分析结果表明,唐山-古冶断裂和唐山断裂土壤气浓度及通量出现高值异常;2017—2018年M_L1.0以上地震多集中在唐山断裂和唐山-古冶断裂,与土壤气异常分布有较好的相关性;土壤气地球化学空间变化特征能反映断裂带的分段活动性。

Analysis of Geochemical Characteristics of Soil Gas in the Tangshan Fault

In view of the relatively few achievements of soil gas geochemistry in Tangshan fault zone, soil gas (Rn, Hg,CO₂) concentration and flux (Rn, Hg) were measured in five faults of Tangshan fault zone during 2017-2018, and the anomaly limits were determined by using the average value of soil gas concentration+2 times mean square deviation. The results show that the soil gas concentration and flux in Tangshan-Guye fault and tangshan fault are abnormal.From 2017 to 2018, earthquakes with magnitude M_L1.0 and above are mostly concentrated in the Tangshan fault and the Tangshan-Guye fault, which had a good correlation with the abnormal distribution of soil gas. The results show that the spatial variation characteristics of soil gas geochemistry can reflect the sectional activity of the fault zone.