地电场地震异常频率相关性统计特征研究

doi:10.12196/j.issn.1000-3274.2023.04.009

Abstract

Abstract: During earthquake preparation and occurrence, there have been relevant reports of abnormal phenomena in the geoelectric field at different frequencies. However, the statistical characteristics of the correlation between the different frequency components of the geoelectric field and the magnitude of earthquakes are still unclear. In this paper, we proposed to use the wavelet transform method to decompose the 12-year data of the geoelectric field in Pingliang station in Gansu Province, Hetian station and Wushi station in Xinjiang, China into different periodic components, such as 24 h, 12 h, 8 h, and 6 h, and then use the shifting correlation method to calculate and analyze the statistical characteristics of the correlation between each component and the magnitude of seismic events within a certain epicentral distance around the station. The results show that the high-frequency components (4 h and 6 h, etc.) of the geoelectric field show correlation anomalies with seismic events of two equivalent magnitude sequences, but the low-frequency components (24 h and 12 h) show correlation anomalies only with seismic events of larger magnitude sequences. Temporally, the correlation anomalies generally appear about 55, 20, or 10 days before the earthquake. This correlation between the frequency of the geoelectric field and the magnitude of earthquakes may be caused by the coupling between the seismogenic fault and tidal action. When the measurement channel of the geoelectric field is consistent with the fault orientation, it is easier to observe seismic anomalies, which may be a specific expression of the selective characteristics of the geoelectric field due to the tectonic rupture in the survey area. In addition, the occurrence time of correlation anomalies is not the same for each station, which may be related to the geological structure and geodynamic environment of the survey area.

Key words: Geoelectric field, Earthquake anomaly, Correlation statistics, Wavelet transform, Shifting correlation

CLC Number:

P315.7

FU A-long, AN Zhang-hui, FAN Ying-ying, YUAN Li-hua, HOU Ze-yu. Study on Statistical Characterization of the Frequency Correlation of Seismic Anomalies in Geoelectric Fields[J]. EARTHQUAKE, 2023, 43(4): 135-152.

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Study on Statistical Characterization of the Frequency Correlation of Seismic Anomalies in Geoelectric Fields

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