Abstract

AbstractOppositely to a previous statistical work using a single time resolution of the total ion density measured onboard the Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) satellite, this work deals with statistical seismo‐ionospheric influences by comparing different parameters and various time resolutions. The O+ density and electron density recorded by the China Seismo‐Electromagnetic Satellite (CSES) for more than one year and by the DEMETER satellite for about 6.5 years have been utilized to globally search ionospheric perturbations with different time resolutions. A comparison is automatically done by software between the occurrence of these ionospheric perturbations determined by different data sets, and the occurrence of earthquakes under the conditions that these perturbations occur at less than 1,500 km and up to 15 days before the earthquakes. Combined with statistical results given by both satellites, it is shown that the detection rate r of earthquakes increases as the data time resolution and the earthquake magnitude increase and as the focal depth decreases. On average, the number of perturbations is higher the day of the earthquake, and then smoothly decreases the days before, which is independent of either ionospheric parameters or time resolutions. The number of right alarms is high near the South Atlantic Magnetic Anomaly area but its relationship with seismic activities is weak. The ion density tends to be more sensitive to seismic activities than the electron density but this needs further investigations. This study shows that the CSES could effectively register ionospheric perturbations due to strong EQs as the DEMETER satellite does.

Highlights

  • With the development of Earth observation satellites, their onboard experiments have gradually shown their potential application in the field of earthquake (EQ) monitoring and investigation

  • Oppositely to a previous statistical work using a single time resolution of the total ion density measured onboard the Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) satellite, this work deals with statistical seismo‐ionospheric influences by comparing different parameters and various time resolutions

  • Another point is that the detection rates for IAP density are clearly higher than that of ISL density for each group of EQs when the time resolution is the same, which probably gives a conclusion that the ion density is more sensitive to seismic activities than the electron density this claim is not completely verified by the China Seismo‐Electromagnetic Satellite (CSES) data

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Summary

Introduction

With the development of Earth observation satellites, their onboard experiments have gradually shown their potential application in the field of earthquake (EQ) monitoring and investigation.

The CSES and the DEMETER Satellite
Description of the Data Processing
Data Processing Method
EQ Detection Rate
Temporal Evolution of Seismo‐ionospheric Influences
Findings
Discussion and Conclusions
Full Text
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