Ricerc@Sapienza

It is well established that earthquakes can trigger atmospheric waves able to propagate right up to the ionosphere as
Coseismic Ionospheric Disturbances (CIDs). They are due to the acoustic waves both produced in the proximity of
the epicenter (within 500 km) and by those triggered by Rayleigh waves propagating far from it. Numerous studies
demonstrated that GNSS (Global Navigation Satellite System) is a mean to detect ionosphere alterations through
computing the total electron content (TEC) value.

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.