Removing tidal and atmospheric effects from Earth deformation measurements

A new numerical procedure has been developed for removing tidal and atmospheric effects from Earth deformation measurements. It was developed in order to manage semi-automatically sequences that are usually difficult to analyse such as very long records, slow earthquakes and volcanic eruptions. Evenly and unevenly spaced time sequences can be analysed for tidal deformation as well as for long-term drift and atmospherically induced terms, even if there are large gaps in the data set. Its performance has been tested by analysing two experimental sequences, one including slow earthquakes and the other an eruption. The results have been compared with those obtained by using the two most widely used codes.