摘要
2016年5月23日河南太康县1km范围内7口农业灌溉井出现了翻花、冒泡、响声等宏观异常现象。为判定异常现象是否与区域内构造活动和地下应力改变有关,2016年5月26～28日采集了16个灌溉井水样、2个引黄水样及4个灌溉井气样,获取了水的离子浓度和氢氧同位素组成以及气体组分和碳同位素组成等地球化学数据。结果表明:区域内井水与引黄河水存在一定的水力联系,与深部地下水没有明显的水力联系;井水中富含Cl^-、SO_4^(2-)及NO_3^-等离子是人类活动影响所致;井内逸出气体主要是生物成因。结合区域内异常发生前,两次引水灌溉规模资料,认为2016年5月23日河南太康群井异常现象是人为引水灌溉引起的,与区域内构造活动和地下应力改变没有直接联系,排除其是地震宏观前兆的可能。
Macro anomalies, such as strong roll, bubbles and sound in 7 irrigation wells within 1 km of Taikang County, Henan Province, occurred on 23rd May 2016. The field investigation was conducted in order to judge whether the phenomena are related to regional tectonic activity or the change of underground stress. 16 samples of well water, 2 samples of drawing water from the Yellow River and 4 samples of well gas were collected. Ion concentration, isotopic ratios and gas composition of the samples were measured. The results indicated that ① there is a certain hydraulic connection between well water and water drawing from the Yellow River, but hydraulic connection between well water and deep groundwater is not obvious; ② the enrichment of Cl^- , SO4^2- and NO3^- in well waters is caused by human activity; and ③ the escaped gases in the wells are mainly biogenic. The anomaly phenomena were caused by artificial irrigation based on two irrigation data before occurrence of anomalies, and no evidence for the correlation between the genesis of anomalies and regional tectonic activity or the change of underground stress was found. Conse- quently, the possibility of seismic macro precursor is eliminated.
作者
钟骏
周志华
李源
王博
夏修军
ZHONG Jun;ZHOU Zhi-hua;LI Yuan;WANG Bo;XIA Xiu-jun(China Earthquake Network Center,Beijing 100045,China;Henan Earthquake Administration,Henan Zhengzhou 450016,China)
出处
《地震》
CSCD
北大核心
2018年第4期109-119,共11页
Earthquake
基金
国家自然科学基金青年项目(41503114)
地震科技星火计划项目(XH15011)
中国地震台网中心青年基金项目(QNJJ201506
QNJJ201610)
