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2017 ; 7
(ä): 46607
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Real-Time Detection of Tsunami Ionospheric Disturbances with a Stand-Alone GNSS
Receiver: A Preliminary Feasibility Demonstration
#MMPMID28429754
Savastano G
; Komjathy A
; Verkhoglyadova O
; Mazzoni A
; Crespi M
; Wei Y
; Mannucci AJ
Sci Rep
2017[Apr]; 7
(ä): 46607
PMID28429754
show ga
It is well known that tsunamis can produce gravity waves that propagate up to the
ionosphere generating disturbed electron densities in the E and F regions. These
ionospheric disturbances can be studied in detail using ionospheric total
electron content (TEC) measurements collected by continuously operating
ground-based receivers from the Global Navigation Satellite Systems (GNSS). Here,
we present results using a new approach, named VARION (Variometric Approach for
Real-Time Ionosphere Observation), and estimate slant TEC (sTEC) variations in a
real-time scenario. Using the VARION algorithm we compute TEC variations at 56
GPS receivers in Hawaii as induced by the 2012 Haida Gwaii tsunami event. We
observe TEC perturbations with amplitudes of up to 0.25 TEC units and traveling
ionospheric perturbations (TIDs) moving away from the earthquake epicenter at an
approximate speed of 316 m/s. We perform a wavelet analysis to analyze localized
variations of power in the TEC time series and we find perturbation periods
consistent with a tsunami typical deep ocean period. Finally, we present
comparisons with the real-time tsunami MOST (Method of Splitting Tsunami) model
produced by the NOAA Center for Tsunami Research and we observe variations in TEC
that correlate in time and space with the tsunami waves.