基于水化学和物理方法的井水位异常分析

doi:10.3969/j.issn.0253-4967.2014.02.019

摘要/Abstract

摘要： 针对2008年汶川M_S 8.0地震后江苏地区的地震观测井水位上升现象，选取了苏18井和井周边地表水进行了水化学和物理分析，研究了井水位异常与地表水和大气降水的补给关系，讨论了井水补给来源及其与高邮-宝应M_S 4.9地震的关系。离子含量和氢氧同位素结果表明，苏18井水主要为大气降水成因，存在一定的水岩作用。应用氯离子分析降水对地下水的补给，其结果显示大气降水在井水补给源中占了重要份额，井水位的突然上升与同期降水量增加有一定关系。水库水与苏18井水之间存在水力联系，大气降水增多致使水库水位升高，对该井水位变化有一定的影响。综合分析认为，大气降水的增多致使水库蓄水增加，水库水通过侧向渗透补给造成了2011年苏18井的水位显著升高。苏18井异常不是由构造活动引起的，作为高邮-宝应M_S 4.9地震的前兆依据不充分。水化学和物理结合的方法为今后判别地下水位异常干扰提供了依据。

关键词: 水位, 水化学, 地震, 苏18井

Abstract: Regional groundwater level change, such as rising or falling, may provide earthquake precursor information. The groundwater levels in earthquake observation wells have been rising in Jiangsu Province since 2008. By analyzing hydrochemical and physical characteristics of the Su-18 well water and surface water nearby, we studied the relationship between groundwater level anomaly and supply of surface water and atmospheric precipitation. Furthermore, we discussed the source of water supply to Su-18 well and the corresponding relationship between the rising water level and the M_S4.9 earthquake. The results show that, the groundwater of Su-18 well and reservoir water nearby are recharged by meteoric waters based on analysis of ion contents and hydrogen and oxygen isotopes. The method of assessment of precipitation recharge to groundwater by the chloride concentration found that the rise of water level is related to the increased rainfall over the same period. There are also hydraulic connections between the surrounding reservoir and Su-18 well. Impoundment activities of reservoir have impact on the groundwater recharge. In summary, the factor affecting the groundwater level anomaly at Su-18 well in 2011 is impoundment of reservoir which was affected by atmospheric precipitation. Reservoir water supplies well water through lateral permeation. This conclusion provides a basic reference for determining water level anomalies in earthquake observation wells in the future.

Key words: water level, hydrochemistry, earthquake, Su-18 well

中图分类号:

P315.72⁺3

张磊, 刘耀炜, 孙小龙, 方震. 基于水化学和物理方法的井水位异常分析[J]. 地震地质, 2014, 36(2): 513-522.

ZHANG Lei, LIU Yao-wei, SUN Xiao-long, FANG Zhen. A STUDY OF WATER LEVEL ANOMALIES USING HYDROCHEMICAL AND PHYSICAL METHODS[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(2): 513-522.

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