Seismo-Ionospheric Effects Prior to Two Earthquakes in Taiwan Detected by the China Seismo-Electromagnetic Satellite

In this paper, we focused on the characteristics of seismo-ionospheric effects related to two successive earthquakes, namely, earthquakes in 2022 Taitung Sea, Taiwan, China, with magnitudes (M) 6.7 and 6.3, at 23.45° N, 121.55° E 23.39° 121.52° same focal depth 20 km, which were detected by China Seismo-Electromagnetic Satellite (CSES). By applying sliding interquartile range method electron density (Ne) data acquired Langmuir probe (LAP) onboard CSES grid total content (TEC) obtained from Center for Orbit Determination Europe (CODE), positive anomalies found under quiet geomagnetic conditions 2–3 March 8–9 2022—that is, 19–20 13–14 d before respectively, global ionospheric mapping (GIM) TEC suggested that may also have been triggered magnetic conjugate area prior occurrences. addition, Ne showed enhancements 3 5 occurred. Furthermore, 138 M ≥ 5.0 occurred Taiwan surrounding region during period February 2019 statistically analyzed using data. The results show most positive. Moreover, greater earthquake magnitude, frequency anomalies; however, amplitude did not increase magnitude. concentrated 10 after earthquakes. No was observed as time approached. Finally, based evidence relating precursor anomalies, conclude it is possible affect ionosphere through geochemical, acoustic, electromagnetic channels, described lithosphere–atmosphere–ionosphere coupling (LAIC) model, studied induced geochemical channel.