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1980年以来，豫北安阳至清丰水准测线上出现了较大的地面沉降漏斗。通过对标石稳定性、采矿影响、地壳构造运动特别是地下水与地壳形变关系的分析研究，认为漏斗形成的原因与地下水和地层有关，并非地震前兆异常。
Since 1980, a large ground subsidence funnel has appeared on the survey line from Anyang to Qingfeng in the north of Henan Province. Through the analysis of the stability of dikes, the influence of mining, the crustal tectonic movement, especially the relationship between groundwater and crustal deformation, it is considered that the causes of formation of funnels are related to groundwater and strata, and not to seismic precursory anomalies.