Observation data quality and typical interference analysis of geoelectric field in Tengchong center station

Abstract

Based on the observation data collation, data quality and interference analysis of the geoelectric field of Tengchong center station from 2018 to 2022, it is considered that the geoelectric field data of Tengchong center station has good correlation with the long and short polar distances in the same direction without interference, with clear diurnal variation and high data reliability. The interference types can be roughly divided into two categories: natural environment interference and artificial interference. Among them, the interference of geoelectric storm, lightning and rainfall belongs to natural environment interference, and the interference of artificial power supply and site leakage belongs to artificial interference. The interference changes caused by geoelectric storm are mainly characterized by large amplitude sharp pulse jumps similar to earthquake waveforms. The interference changes caused by lightning are mainly characterized by typical large amplitude distortions. The interference changes caused by rainfall are mainly characterized by large decreases. The interference changes caused by ground resistivity power supply in the same observation site are mainly characterized by regular pulse jumps. The interference caused by street lamp leakage mainly exhibit a step-type periodic variation change. By analyzing the forms and physical mechanisms of changes in the geoelectric field caused by different types of interference sources, methods to solve the interference are proposed to improve the quality of geoelectric field observation and provide a basis for the effective identification of geoelectric field interference and earthquake prediction.

Keywords

• geoelectric field
• interference types
• physical mechanism
• observation data quality