Ricerc@Sapienza

The VARION (Variometric Approach for Real-Time Ionosphere Observation) algorithm has been successfully applied several times to TIDs (Travelling ionospheric disturbances) detection in a real-time scenario. VARION is, thus, able to estimate sTEC variations in real time and it can be applied on ship-based GNSS receiver since it is based on geometry free combination: the receiver motion does not affect the sTEC estimation process. This work is a feasibility study on the possibility to use data from ship-based GNSS receiver to detect

High-frequency geodesy is here intended as the capability of retrieving information relevant to geodesy and geophysics at high frequency through geodetic measurements and methodologies. In particular, this short review work focuses on two aspects: fast ground motions, as those due to earthquakes, and fast ionospheric total electron content (TEC) disturbances, as those caused by tsunamis.

The paper investigates on the hydro-acoustic waves propagation caused by the underwater earthquake, occurred on 6 February 2012, between the Negros and Cebu islands, in the Philippines. Hydro-acoustic waves are pressure waves that propagate at the sound celerity in water. These waves can be triggered by the sudden vertical sea-bed movement, due to underwater earthquakes. The results of three dimensional numerical simulations, which solve the wave equation in a weakly compressible sea water domain are presented.