An analysis of the coseismic differential response characteristics of well water levels and chemical components : A case study triggered by the Qingbaijiang earthquake
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摘要:
相邻监测井的同震差异响应分析是研究地下水同震响应机理的路径之一。2020年2月3号青白江地震引发了龙泉山地下水监测井水位及水质的异常变化。利用多种水化学组分及水位的自动监测数据分析了相邻两口监测井的同震差异响应特征，讨论了水化学组分及水位差异响应机理。在相同能量密度情况下，ZK1水位变幅较ZK6大，表明ZK1对本次地震响应的敏感性高于ZK6。地震主要引起了处于还原环境（Eh<0）的第二含水层（主要离子为
< span class="inline-formula-span" > < span class="inline-formula-span" > ${\rm{NH}}_4^+ $ < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916092230.png'/ > < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916092230.png'/ > < span class="inline-formula-span" > < span class="inline-formula-span" > ${\rm{NO}}_3^- $ < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916085441.png'/ > < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916085441.png'/ > Abstract:Analysis of the coseismic differential response of adjacent monitoring wells is an important way to study the coseismic response mechanism of groundwater. On February 3, 2020, the Qingbaijiang earthquake caused the abnormal changes of groundwater levels and water quality in the monitoring wells of Longquanshan. In this paper, the coseismic differential response characteristics of two adjacent monitoring wells are analyzed by using the automatic monitoring data of various hydrochemical components and water levels. Based on the coupling response characteristics of hydrochemical components and water levels, the mechanism of differential response of hydrochemical components and water levels is discussed. In the case of the same energy density, the water level variation amplitude of well ZK1 is larger than that of well ZK6, which indicates that ZK1 is more sensitive to the earthquake response than ZK6. The earthquake mainly caused the discharge of the groundwater (Eh<0) from the second aquifer (
< span class="inline-formula-span" > < span class="inline-formula-span" > ${\rm{NH}}_4^+ $ < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916092307.png'/ > < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916092307.png'/ > < span class="inline-formula-span" > < span class="inline-formula-span" > ${\rm{NO}}_3^- $ < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916085527.png'/ > < /span > < img text_id='' class='formula-img' style='display:none;' src='202104019_Z-20210916085527.png'/ > -
Key words:
- monitoring wells /
- hydrochemical components /
- water level /
- coseismic response /
- permeability of aquifer
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表 1 ZK1和ZK6水位及水化学参数同震变化表
Table 1. Coseismic response of water levels and chemical components in ZK1and ZK6
井号 阶段 水位埋深/m Cl−/（mg·L−1） 
/（mg·L−1）
/（mg·L−1）pH Eh/mV TDS/（mg·L−1） 温度/℃ ZK1 震前 12.36 2280 / / / / 1435.5 / 震后 11.56 2084 / / / / 1384.9 / ZK6 震前 13.43 3575 0.1 / 7.27 481 1888.7 / 震后 13.18 4327 1.4 / 7.35 404 2247.3 / 注：“/”表示震前及震后无明显异常。 
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