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1985年2月20日自贡南3.9级地震之后,3月29日19时15分02秒,在自贡市东北近郊(北纬29°22′08″,东经104°51′34″)又发生了4.6级地震。位于震中东南约45千米的川12井,其水位观测不仅记录到了这次地震的震时与震后异常(同震与震后效应),而且用相关分析方法定量地排除干扰因素影响后的水位曲线,显示了明显的临震前兆异常。本文拟对此作一粗浅的分析、讨论。
After the Zigong South M (subscript S) 3.9 Earthquake on February 20, 1985, 19:15:02 on March 29, another 4.6 occurred in the northeastern outskirts of Zigong City (latitude 29 ° 22’08 “north, longitude 104 ° 51’34” east) Earthquake. The Chuan 12 well, located about 45 km southeast of the epicenter, not only records the post-earthquake anomalies (coseismic and post-earthquake effects) of the earthquake but also quantitatively excludes the influence of interference factors by correlation analysis Water level curve, showing a clear projectile precursory anomalies. This article intends to make a superficial analysis and discussion.