Characteristic analysis of geoelectric field pulse signal at Dulan station before three M6 or above earthquakes in Northwest China from 2021 to 2022

Chen YU, Ying HAN, Ye FAN, YaLi WANG, ZhongPing WANG, Li YAO, Tao XIE

Prog Geophy ›› 2025, Vol. 40 ›› Issue (4) : 1383-1393.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (4) : 1383-1393. DOI: 10.6038/pg2025HH0289

Characteristic analysis of geoelectric field pulse signal at Dulan station before three M6 or above earthquakes in Northwest China from 2021 to 2022

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Abstract

Experiments show that electromagnetic pulse anomalies could be observed in rock samples before rupture. In this paper, a method is proposed to identify the changes of geo-electric field pulses before earthquakes, which can be used to analyze the evolution characteristics of geo-electric field anomalies in the short and medium term before strong earthquakes. The low-frequency signal component (daily trend signal) in the geo-electric field observation data is removed, and the amplitude deviation of the high-frequency pulse signal from the normal distribution is calculated under logarithmic coordinates. The difference between the amplitude of the geo-electric field that deviates from the normal distribution and the fitting extrapolation amplitude that meets the normal distribution (ΔE) is used as the parameter to identify the pre-earthquake anomaly. The characteristics of geo-electric field pulse change before three earthquakes (≥6) in Northwest China from 2021 to 2022 are analyzed. The results show that the amplitude enhancement of geo-electric field pulse changes at the monthly prediction scale, which has a certain correlation with the occurrence of earthquakes (≥6) around the station.

Key words

Geo-electric field / Pulse amplitude / Short and medium term anomaly / High frequency signal / Dulan station

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Chen YU , Ying HAN , Ye FAN , et al . Characteristic analysis of geoelectric field pulse signal at Dulan station before three M6 or above earthquakes in Northwest China from 2021 to 2022[J]. Progress in Geophysics. 2025, 40(4): 1383-1393 https://doi.org/10.6038/pg2025HH0289

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