Ionospheric Anomalies related to the (Mw=7.3), 16 April 2016 Kyushu Earthquake using Two-Dimensional Principal Component Analysis

Authors : Jyhwoei LİN

Pages : 545-551

View : 16 | Download : 9

Publication Date : 2017-12-11

Article Type : Research Paper

Abstract :Two-dimensional principal component analysis insert ignore into journalissuearticles values(2DPCA); were used to examine the ionospheric total electron content insert ignore into journalissuearticles values(TEC); data during the time period from 00:00 on 11 April to 00: 25 on 16 April insert ignore into journalissuearticles values(UT); 2016, which were 5 days before the Mw=7.3 Kyushu earthquake at 00:25:06 on 16 April 2016 insert ignore into journalissuearticles values(UT); with the epicenter insert ignore into journalissuearticles values(32.782°N, 130.726°E); and the depth of 10km. From the analysis result of 2DPCA, a TEC precursor was found localized nearby the epicenter during the time period from 06:20 to 06:25 on 11 April 2016 insert ignore into journalissuearticles values(UT); with the duration time of at least 5 minutes. The past studied by other researchers discusses potential reasons for TEC anomaly due to large earthquake mainly including radon gas release, P-type semiconductor effect insert ignore into journalissuearticles values(electric fields); and shock-acoustic waves for the TEC anomaly However, the possible reasons of the TEC anomaly related to this earthquake should be radon gas release and P-type semiconductor effects before the earthquake. Shock-acoustic wave was impossible reason because before this earthquake, large ground surface vibrations that formed shock-acoustic waves were not detected.
Keywords : Two dimensional principal component analysis 2DPCA, Ionospheric total electron content TEC, Kyushu earthquake, Radon gas release, P type semiconductor effects, Sh