为了捕捉构造区域内应力场变化和地震地球物理异常,“十三五”期间,宿迁市辖区沿郯庐断裂带规划建设10个断层土壤气观测站,用于监测郯庐断裂带宿迁段断层土壤气,如Rn、H2和CO2的逸出浓度。通过近2年的连续观测,发现强降雨对仪器计数和台站运维造成较大影响,尤其是气氡观测,降雨影响显著。分析认为,我国中西部(干旱少雨)断层土壤气观测集气坑设计施工方案,在郯庐断裂带宿迁段土壤气监测中并不适用,需充分考虑我国东南部地区地下水埋深浅和季节性强降雨等因素,对集气设施和观测装置进行设计和改进,以满足当地断层土壤气Rn的连续观测的技术要求。
During the 13th Five-Year plan period, 10 fault soil gas stations were planned and built along the Tanlu fault zone in Suqian city to capture the variation of stress field and the anomaly of seismic geophysics in the tectonic region, which areused to monitor the exhalation concentration of soil gas such as Rn, H2 and CO2 in Suqian segment of Tanlu fault zone. Through continuous observation in recent two years, it is found that heavy rainfall has a great influence on instrument counting and station operation, especially gas radon observation. It is considered that the design and construction scheme of the soil gas observation and collection pit of the middle-west (arid and less rainy) fault in our country is not applicable to the soil gas monitoring of Suqian section of the Tanlu fault zone. Therefore it is necessary to design and improve gas-collecting facilities and observation devices in the southeast of our country, taking into full account such factors as the groundwater depth and seasonal heavy rainfall, etc. , in order to meet the technical requirements of the continuous observation of the local fault soil gas Rn.
2024,45(3): 113-121 收稿日期:2024-02-04
DOI:10.3969/j.issn.1003-3246.2024.03.015
基金项目:宿迁市防震减灾“十三五”发展规划课题研究(项目编号:宿政办发〔2017〕64号);宿迁市市级指导性科技计划项目(项目编号:Z2022115)
作者简介:单友磊(1988—),男,高级工程师,主要从事地震分析预报和仪器运维工作。E-mail:1773979777@qq.com
参考文献:
曹玲玲,高安泰. 气温气压与断层气氡浓度短期变化的相关性分析[J]. 地震学报,2014,36(4):719-729.
陈希泉,陈颉,罗先熔,等. 地气(氡气)测量方法寻找隐伏含矿断裂试验[J]. 物探与化探,2011,35(6):817-820.
杜建国,宇文欣,李圣强,等. 八宝山断裂带逸出氡的地球化学特征及其映震效能[J]. 地震,1998,18(2):155-162.
官致君,闻学泽,程万正. 断层气CO2快速测定方法在四川地震预测中的应用[J]. 地震研究,2003,26(Z1):118-125.
黄春玲,王洪峰,李民,等. 断层气观测在夏县中心地震台的应用研究[J]. 山西地震,2015,(2):24-29.
林元武,王基华,高松升. 断层气CO2测定新方法与张北-尚义6.2级地震预报[J]. 地震,1998,18(4):353-357.
邱永平. BG2015R与P2000型测氡仪在气氡连续观测中的比测实验[J]. 内陆地震,2020,34(2):174-179.
任峰,邵永新,姚新强,等. 断层气方法对日喀则地区活断层探测及活动性初步判定[J]. 地震工程学报,2017,39(Z1):35-42.
石玉春,徐英凤,马宏伟,等. 土壤氡浓度随气象因素变化规律及其应用[J]. 中国科学(B辑),1994,24(11):1 190-1 196.
史杨,官致君,杨耀. 断层土壤气氡的应用综述[J]. 四川地震,2017,(2):38-44.
汪栋,方方,丁卫撑,等. 土壤氡浓度日变化影响因素研究[J]. 物探与化探,2014,38(3):485-489.
许汉刚,李丽梅,黄永林,等. 宿迁市活动断层探测与地震危险性评价报告[R]. 南京:江苏省地震工程研究院,2017.
闫玮,朱成英,李新勇,等. 新疆伽师MS 6.4地震前后柯坪断裂土壤气地球化学特征变化[J]. 内陆地震,2022,36(4):362-368.
姚锦其,赵友方. 氡气测量在栗木锡铌钽矿外围的找矿效果[J]. 物探与化探,2009,33(3):286-289.
张成友. 土壤中氡浓度检测与影响因素分析[J]. 科技资讯,2017,(35):212.
朱自强,简春林,宇文欣. 土氡测量影响因素的初步探讨[M]. 北京:地震出版社,1991:222-226.
King C Y, Zhang W, King B S. Radon anomalies on three kinds of faults in California [J]. Pure Appl Geophys, 1993, 141(1): 111-124.
Miklavi, Radoli V, Vukovi B, et al. Radon anomaly in soil gas as an earthquake precursor[J]. Applied Radiation and Isotopes, 2008, 66(10): 1 459-1 466.
Toutain J P, Baubron J C. Gas geochemistry and seismotectonics: A review[J]. Tectonophysics, 1999, 304(1/2): 1-27.
Zhuo W H, Furukawa M, Guo Q J, et al. Soil radon flux and outdoor radon concentrations in East Asia[J]. Int Congr Ser, 2005, 1276: 285-286.
Li Y, Du J G, Wang X, et al. Spatial variations of soil gas geochemistry in the Tangshan area of northern China[J]. Terr Atmos Oceanic Sci, 2013, 24(3): 323-332.