Study on co-seismic ionospheric disturbance of Alaska earthquake on July 29, 2021 based on GPS TEC

Abstract

With the rapid development of space geodetic information technology, the Global Positioning System (GPS) has been widely used in seismology and space environmental research. Typically, the occurrence of a large earthquake will lead to some changes in the ionosphere, this phenomenon is called coseismic ionospheric disturbances (CIDs). In this contribution, differential slant total electron content (dSTEC) is used to study the anomalous characteristics of the ionosphere. First, based on the ionospheric dSTEC time series and two-dimensional disturbance detection, the temporal and spatial characteristics of ionospheric disturbances can be accurately analysed. Secondly, using wavelet transform spectrum analysis and disturbance propagation velocity, it can be determined that the disturbance sources of this earthquake can be identified as acoustic wave, gravity wave and Rayleigh wave. Finally, in order to further clarify the direction of the earthquake disturbance, this study focuses on proposing an innovative method for the disturbance propagation direction, and determines that there are two directions of the propagation of the CIDs of the Alaski earthquake.

The Analysis of Ionospheric TEC Anomalies Prior to the Jiuzhaigou Ms7.0 Earthquake Based on BeiDou GEO Satellite Data

“…The latter example refers to the investigation of the coupling relationship between the lithosphere, atmosphere, and ionosphere. For example, Nayak et al [9] discussed the potential impact of ionized gases released from the crust on the ionosphere, and Ruan et al [10] investigated the relationship between ionospheric abnormalities and acoustic-gravity waves. Notably, the Russian scientist Pulinets has Remote Sens.…”

“…Currently, approximately 170 stations are capable of receiving GEO satellite data in China. Several studies have demonstrated a significant correlation between seismoionospheric anomalies and the magnitude of earthquakes [10]. Consequently, investigating earthquakes of higher magnitudes can offer more favorable prospects for the examination of ionospheric anomalies and the elucidation of the mechanisms underlying seismic ionospheric disturbances.…”

Multi‐Instrument Observations of Various Ionospheric Disturbances Caused by the 6 February 2023 Turkey Earthquake

“…This complementary view from observations from different instruments, is ideal for detecting different disturbance types (Astafyeva, 2019; Meng et al., 2019). A lot of recent research has focused on the detection of ionospheric signatures of earthquakes in GNSS data or in satellite data (M. Li et al., 2023; S. Li et al., 2023; Maletckii & Astafyeva, 2021; Ruan et al., 2023; Yang et al., 2022), because for much of the globe these are the only available observations. However, in the European region, more types of instruments are available in relatively dense observational networks (see Figure 1).…”