Statistical Detection Threshold for Ionospheric Disturbances induced by Tsunami Using GPS Measurements of LEO Satellite

Bugyeom Kim, O-jong Kim, and Changdon Kee

Abstract: Tsunamis accompanied by earthquakes can induce disturbances in the ionosphere. This tsunamigenic ionospehric disturbances can be detected by analyzing the ionospheric delay of the GPS signal. Since tsunamigenic ionospheric disturbances travel along with tsunami in ocean, there are difficulties to detect by using GPS measurements collected by ground reference station. Therefore, in order to detect tunamigenic ionospheric disturbances, using GPS measurements collected from low earth orbit satellites has been proposed. GPS measurements involving ionospheric disturbances show different frequency characteristics than normal condition. Therefore, a monitoring value of disturbances can be generated by band-pass filter. Ionospheric disturbances can be detected by comparing monitoring values of disturbed ionosphere with those of normal ionosphere. In this study, we propose a technique to calculate detection threshold for tsunamigenic ionospheric disturbances when using GPS measurements collected by low earth orbit satellites. The monitoring value is a band-passed total electron content with 50-80mHz pass band. GPS measurements without disturbances were collected to calculate the 1sigma level of the monitoring value. After that, the detection threshold is selected as 3sigma value by modeling according to the altitude. It a monitoring value of certain data exceeded the threshold, we determine that the disturbance is detected. Data of 2011 Tohoku earthquake are used to validate the detection criteria. As a result, a disturbance could be detected through the detection criteria. Subsequently, we attempt to detect disturbances from the data of 2015 Chile earthquake. In conclusion, a potential candidate data of the disturbance could be analyzed.
Published in: Proceedings of the 2020 International Technical Meeting of The Institute of Navigation
January 21 - 24, 2020
Hyatt Regency Mission Bay
San Diego, California
Pages: 934 - 943
Cite this article: Kim, Bugyeom, Kim, O-jong, Kee, Changdon, "Statistical Detection Threshold for Ionospheric Disturbances induced by Tsunami Using GPS Measurements of LEO Satellite," Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020, pp. 934-943.
https://doi.org/10.33012/2020.17188
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