The complex, static displacement of a very long period seismic signal observed at Soufrière Hills volcano, Montserrat, WI

In this study we demonstrate how very-long period (VLP) volcanic seismic signals can be processed in order to obtain essential and detailed information about the seismo-volcanic source process. As an example use VLP signal observed on 23 March 2012 during outgassing event at Soufrière Hills volcano, Montserrat, acquired by instruments with different natural periods. The aim of is highlight importance retrieving correct time function a complete restitution When ground displacement cannot retrieved through process due very narrow band-pass limited instrument response, compare synthetic waveforms velocity domain determine best model generating seismogram using band-limited seismometer characteristics. Furthermore, show approach forward modelling reveal much more detail process, since small changes are enhanced seismogram. Using these restituted modelled displacements perform moment tensor inversion combined grid search locating 600 m depth below sea level estimating volume change range 0.6?1.1 × 103 m3.