2023年积石山MW6.0地震前电离层TEC与声重波耦合现象

doi:10.12196/j.issn.1000-3274.2024.04.005

Abstract

Abstract: Ionospheric precursors are crucial indicators for short-term earthquake preparation, and abundant observations of them have been accumulated. Meanwhile, developments concerning the formation mechanisms of seismology ionospheric anomalies have led to increasing interest in the LAI coupling process, in which the AGW-agent hypothesis has been intensively discussed. Based on the BDS TEC data collected by CMONOC GNSS stations, this paper explores the spectral characteristics and spatial-temporal variations of the TEC perturbations from 14 hours before to 2 hours after the Jishishan M_W6.0 earthquake on December 18, 2023, in Gansu Province, China. According to the results, the pre-earthquake AGW-induced perturbation originated from points close to the epicenter and then dispersed outward as an arc-like structure. In addition, the background signal MSTIDs played the role of a carrier in the propagation of the perturbation, while the other two external signals exerted an interference effect on it. Finally, two promising candidates for the excitation and origination of the surface AGW signal are reviewed. Nevertheless, the connection between earthquake preparation and AGW signals needs further validation and investigation.

Key words: The 2023 Jishishan M_W6.0 earthquake, BDS TEC, Acoustic-gravity wave, Seismo-ionospheric anomaly

CLC Number:

P315.72

LIU Hong, ZHANG Xue-min, YANG Na. Phenomenon of Ionospheric TEC Coupled with Acoustic-gravity Waves Preceding Jishishan M_W6.0 Earthquake in 2023[J]. EARTHQUAKE, 2024, 44(4): 62-81.

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Phenomenon of Ionospheric TEC Coupled with Acoustic-gravity Waves Preceding Jishishan M_W6.0 Earthquake in 2023

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Phenomenon of Ionospheric TEC Coupled with Acoustic-gravity Waves Preceding Jishishan MW6.0 Earthquake in 2023

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Phenomenon of Ionospheric TEC Coupled with Acoustic-gravity Waves Preceding Jishishan M_W6.0 Earthquake in 2023