The post seismic effect of far-field strong earthquakes of water radon and its mechanism analysis for L01 well of Lujiang geothermal hot spring
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摘要: 庐江地热温泉1号井位于郯庐断裂带上，水氡测项出现远场强震震后效应现象。通过收集郯庐断裂带安徽段沿线9个主要地震观测井、地热温泉井和地表水样品，检测水样的阴阳离子和同位素，对比分析庐江地热温泉井地下水的来源深度，研究其震后效应及机理。结果表明：地热温泉井水化学类型复杂，温泉井L01，L03，L07和SC井的Cl−浓度较高、
${{\rm{HCO}}_3^ - }$ /Cl−和${{\rm{SO}}_4^{2 - }}$ /Cl−浓度比值较低，体现出地下热水径流交替作用强烈，L11井有较大比例的冷水混入，L03井有较浅的热源埋深。庐江地热温泉井和舒城井的水样具有明显的壳源特征，L01井和SC井地表出露温度最高、L01井循环深度最深，由Na-K-Mg三角图估算L01井循环深度达12 km，反映出较多的深部构造活动信息。分析认为庐江地热温泉1号井以垂向补给方式为主，具有较深的热源埋深，远场强震的地震波引起较弱的区域构造活动，改变了深部热源的补给量，从而引起水氡上升的同震响应现象。Abstract: The Lujiang geothermal hot spring well No.1 is located on the Tanlu fault zone, where hydro-radon response to teleseism were observed. Nine geochemistry samples from the observation wells, geothermal hot spring wells and surface water along Anhui section of Tanlu fault zone were collected. The potential triggering mechanism was studied by analyzing the anion and isotope contents, as well as the source depth of the retrieved samples. The results show that the hydrochemical type is complex. The concentrations of Cl− within L01, L03, L07 and SC wells are high, whereas the concentration ratios of${\rm{HCO}}_3^ -$ / Cl− and${\rm{SO}}_4^{2 - }$ /Cl− are low, implying a strong interaction between the surface water and underground hot water, The L11 well has a large proportion of mixed cold water, and the depth of a heat source is low for L03. Water samples from Lujiang and Shucheng hot spring wells might come from crust, having moreinformation of deep tectonic activities, since the L01 and SC have the highest surface temperature and circulation depth of L01 is the deepest. The estimated depth is 12 km by calculating the Na-K-Mg concentrations. In addition, the results indicate that Lujiang geothermal hot spring well No.1 is dominated by vertical recharge and has a deeper heat source. Seismic waves could have caused weak regional tectonic activities, which change the supply of deep heat source, and cause the high hydro-radon concentrations observed.-
Keywords:
- hot spring well /
- isotope /
- geochemical characteristics /
- postseismic effect
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图 1 庐江地震台1号地热温泉井水氡曲线图
Figure 1. Radon change of L01 geothermal hot spring well in Lujiang seismic station
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图 2 庐江地震台1号地热温泉井远场强震辅助测项变化曲线图
Figure 2. Auxiliary test item change for far field strong earthquakes of L01 geothermal hot spring well in Lujiang seismic station
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图 3 断裂、温泉采样点及对应的地震分布图
F1：嘉山—庐江断裂；F2：池河—太湖断裂；F3：朱顶—石门山断裂；F4：五河—合肥断裂
Figure 3. Locations of faults，sampling sites and earthquakes that caused hydrological changes
F1：Jiashan-Lujiang fault；F2：Chihe-Taihu fault；F3：Zhuding-Shimenshan fault；F4：Wuhe-Hefei fault
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图 5 水样中氯离子与钠离子浓度、离子比例及SiO2浓度的变化关系
Figure 5. Plots of sodium concentration，ion ratios，silicon dioxide versuschloridion concentration in these water samples
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图 6 水样的氢氧稳定同位素与大气降水线的关系图
Figure 6. Relationship between hydrogen and oxygen isotopes in water samples and meteoric water line
表 1 庐江地震台1号地热温泉井水氡远场强震异常及对应地震
Table 1 Radon abnormal changes triggered by teleseism for the L01 geothermal hot spring well within Lujiang seismic station and its corresponding earthquakes
远场强震 异常
类型异常
幅度异常滞后
时间/d震中距/km 其它测项 异常持续
时间/d对应地震 时间间
隔/d发震日期 地点 MS 发震日期 发震
地点MS 1999−09−21 集集 7.6 上升 16% 0 879 水位上升
水温下降367 1999−12−30 利辛 4.1 100 2004−12−26 印尼 8.7 上升 38% 18 3900 无 185 2005−11−26 九江 5.7 325 2008−05−12 汶川 8.0 上升 25% 8 1233 水位上升
水温下降135 2009−04−06 肥东 3.5 329 2011−03−11 日本 9.0 上升 24% 0 2473 水位上升
水温下降245 2011−06−17 桐城 3.7 98 
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表 2 水样测试结果
Table 2 Test results of water samples
样品名 编号 PH ρ/（mg·L−1） 水化学类型 TDS K+ Na+ Ca2+ Mg2+ Fe3+ Cl− SO42− HCO3− NO3− SiO2 1号井 L01 7.00 1078.60 69.23 277.22 24.42 0.12 0.01 52.23 570.90 95.14 8.4 55.65 Na-SO4 3号井 L03 7.10 545.40 3.35 153.25 22.83 0.15 0.10 57.48 213.50 107.61 4.8 24.75 Na-SO4-HCO3-Cl 7号井 L07 7.00 994.25 17.51 288.83 20.38 0.29 0.05 50.49 215.40 107.55 8.2 47.94 Na-SO4 11号井 L11 7.20 300.15 2.42 93.22 5.62 0.07 0.12 17.96 81.03 129.13 6.0 20.72 Na-HCO3-SO4 庐江水库 LR 9.49 1.16 9.48 14.96 2.56 — 6.15 27.05 36.61 17.80 Ca-Na-HCO3-SO4 舒城站 SC 7.00 1398.40 21.06 319.26 100.60 0.21 0.03 51.49 931.30 37.23 7.45 58.71 Na-Ca-SO4 巢湖井 CH 11.58 32.81 585.25 5.03 — 6.03 1457.77 — — Ca-SO4 五河井 WH 7.87 0.82 52.81 45.32 18.24 — 17.97 45.36 395.39 0.08 Na-Ca-Mg-HCO3 女山井 NS 8.18 2.77 89.91 12.73 10.83 — 17.80 2.57 292.88 0.77 Na-HCO3 注：“—”表示低于检测限，ρ表示物质的浓度。
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表 3 样品同位素测试结果
Table 3 Isotope test results of water samples
样品名 编号 δD δ18O 3He/4He He/10−6 4He/20Ne 1号井 L01 −64.122 6‰ −10.046 6‰ 2.03×10−7 5333.3 123.39 3号井 L03 −60.521 3‰ −9.210 6‰ 2.06×10−7 554.0 18.16 7号井 L07 −60.486 0‰ −9.163 3‰ — — — 11号井 L11 −62.305 4‰ −9.768 2‰ 1.60×10−7 841.5 46.18 庐江水库 LR −34.043 3‰ −6.371 5‰ — — — 舒城站 SC −62.986 7‰ −9.821 5‰ 5.85×10−7 1867.8 107.29 巢湖井 CH −57.945 3‰ −8.591 0‰ 1.70×10−6 45.0 2.66 五河井 WH −45.847 5‰ −6.832 3‰ 4.09×10−7 17.4 1.06 女山井 NS −49.814 2‰ −7.322 2‰ — — — 注：“−”表示未检测，氦含量指在气体中的体积比。
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