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. 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. In this contribution, differential slant total electron content (dSTEC) is used to study the anomalous characteristics of the ionosphere. Typically, the occurrence of a large earthquake will lead to some changes in the ionosphere, this phenomenon is called coseismic ionospheric disturbances (CIDs). With the rapid development of space geodetic information technology, the Global Positioning System (GPS) has been widely used in seismology and space environmental research.
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