Analysis of Geochemical Characteristics of Soil Gas in the Tangshan Fault
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摘要: 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ML1.0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。Abstract: 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 ML1.0 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.
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Key words:
- Soil gas /
- Geochemistry /
- Tangshan-Guye fault /
- Tangshan fault
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图 1 唐山断裂带地质构造图（尤惠川等，2002；尹宝军，2010）
Figure 1. Tectonic map of the Tangshan fault zone (based on You et.al., 2002; Yin et al., 2010)
图 3 巍峰山-长山南坡断裂土壤气浓度测值曲线
Figure 3. The curve of soil gas Weifengshan—changshan nanpo fault
图 4 唐山-丰南断裂土壤气浓度测值曲线
Figure 4. The curve of soil gas concentrations in the Tangshan—fengnan fault
图 5 古冶断裂土壤气浓度测值曲线
Figure 5. The curve of soil gas concentrations in the Tangshan—Guye fault
图 7 2017—2018年唐山断裂带地震空间分布图
Figure 7. Spatial distribution of earquakes along the Tangshan fault zone during 2017—2018
表 1 唐山断裂带土壤气浓度测量结果
Table 1. The result of soil gas concentrations in the Tangshan fault zone
剖面 气体组分 时间/年-月 最小值 最大值 平均值 3期平均值 异常下限 徐庄子 Rn/kBq·m-3 2017-10 1.00 26.86 12.18 12.66 28.27 2018-04 1.18 23.90 10.81 2018-10 4.19 29.10 14.98 Hg/ng·m-3 2017-10 5.00 55.00 18.00 13.00 29.00 2018-04 3.00 30.00 10.00 2018-10 3.00 38.00 12.00 CO2/% 2017-10 0.00 4.40 0.82 1.04 1.72 2018-04 0.32 1.66 1.10 2018-10 0.35 3.41 1.21 巍峰山 Rn/kBq·m-3 2017-10 4.11 25.60 12.34 11.45 33.56 2018-04 2.05 22.11 11.27 2018-10 5.21 17.90 10.75 Hg/ng·m-3 2017-10 3.00 28.00 11.00 13.00 26.00 2018-04 3.00 60.00 15.00 2018-10 7.00 57.00 14.00 CO2/% 2017-10 0.00 0.85 0.39 0.52 1.57 2018-04 0.15 1.12 0.56 2018-10 0.23 1.31 0.62 四王庄 Rn/kBq·m-3 2017-10 1.38 16.59 8.80 9.31 33.58 2018-04 1.00 19.26 8.00 2018-10 1.54 19.19 11.14 Hg/ng·m-3 2017-10 5.00 18.00 10.00 15.00 14.00 2018-04 7.00 54.00 18.00 2018-10 6.00 32.00 17.00 CO2/% 2017-10 0.00 0.43 0.22 0.77 3.45 2018-04 0.12 2.22 0.55 2018-10 0.37 3.02 1.55 孩儿屯 Rn/kBq·m-3 2017-10 1.34 8.98 4.18 4.90 8.02 2018-04 1.00 15.52 6.34 2018-10 2.53 6.20 4.17 Hg/ng·m-3 2017-10 6.00 38.00 12.00 16.00 35.00 2018-04 4.00 45.00 18.00 2018-10 7.00 36.00 18.00 CO2/% 2017-10 0.38 4.86 1.71 0.99 2.07 2018-04 0.04 3.24 0.72 2018-10 0.34 1.53 0.55 重广庵 Rn/kBq·m-3 2017-10 3.29 19.18 8.62 9.11 19.36 2018-04 4.35 24.86 11.21 2018-10 1.39 18.04 7.50 Hg/ng·m-3 2017-10 3.00 11.00 6.00 12.00 28.00 2018-04 7.00 19.00 11.00 2018-10 5.00 38.00 18.00 CO2/% 2017-10 0.68 2.45 1.22 1.04 2.32 2018-04 0.26 1.43 0.59 2018-10 0.30 2.48 1.30 
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表 2 唐山断裂带土壤气Rn和Hg通量测量结果
Table 2. The result of flux for Rn and Hg in the Tangshan fault zone
组分 时间 徐庄子 巍峰山 四王庄 孩儿屯 重广庵 Rn/mBq·m-2·s-1 2017-10 3.70 6.40 1.70 1.60 11.90 2018-04 — — 0.60 0.50 0.70 2018-10 1.30 1.40 1.80 0.70 — Hg/ng·m-2·h-1 2017-10 0.10 — 1.40 0.10 0.02 2018-04 — — 0.60 15.60 0.70 2018-10 0.60 — — — 0.40
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