Observational analysis reveals distinct pre-seismic ionospheric anomalies before the 2024 Taiwan earthquake, suggesting atmospheric disturbances correspond to the pre-rupture meta-instability phase.
In this letter, we investigated the potential spatiotemporal characteristics of ionospheric anomalies before the Taiwan earthquake occurred on April 2, 2024, by utilizing the total electron content (TEC) and electron density (Nₑ) observations. These anomalies of global ionospheric map (GIM)-TEC, global positioning system (GPS)-TEC, tomographicNₑ, and SwarmNₑwere identified with the GIM, the GPS, and Swarm satellites, respectively. After eliminating the influence of solar and geomagnetic activities, positive anomalies were exhibited by both GIM-TEC and GPS-TEC parameters on March 27 and 29, followed by negative anomalies from April 1 to 3, indicating a noticeable spatiotemporal overlap. The negativeNₑanomaly 2 h before the shock at the height of 450 km was consistently confirmed by tomographicNₑand SwarmNₑ. The spatiotemporal features of increased intensity and expanded range of ionospheric anomalies on April 2 coincided precisely with the meta-instability phase before the mainshock.
No takes yet. Share an insight, caveat, or question.
Wu et al. (2024) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: