Abstract: Based on GPS TEC single-station data, GIM TEC, ionosonde, and in situ electron density observed by China Seismo-Electromagnetic Satellite, this paper studies the ionospheric disturbances caused by the M_S7.0 earthquake in Indonesia on August 18, 2020 (Universal time) by temporal series and spatial disturbance extraction methods. Through the analysis, we found that the anomalies of multiple data sources mainly occurred from August 12 to August 15. There was a significant increase in GPS TEC and GIM TEC near the epicenter on August 12, positive anomalous disturbances extracted from satellite in situ electron density and GIM TEC data on August 13, an increase in satellite in situ electron density and GPS single-station TEC values observed on August 14, and positive anomalies occurred in satellite in situ electron density, GIM TEC and GPS TEC on August 15. The ionospheric anomaly caused by the earthquake occurred not only over the epicenter, but also in its magnetic conjugate region. Corresponding to the TEC anomaly near the epicenter, the GPS TEC in the magnetic co-region had synchronous disturbances on August 12, the satellite data, GIM TEC and single-station TEC responded synchronously in the magnetic conjugate region on August 13, the satellite in situ electron density, GIM TEC, GPS single-station TEC and ionosonde data in the magnetic conjugate region on August 15 extracted to the positive anomalous perturbation, and they showed certain commonalities with the time and amplitude of the disturbances over the epicenter.

Key words: Ionospheric detection means, Earthquake, Comprehensive analysis, Electron density, Anomaly extraction