Seismic changes as an unrest detection tool

Two approaches to developing a volcanic unrest detection tool for seismic data recorded at active volcanoes: (i) An automated analysis tool to monitor volcanic pre-eruptive tremor completed and ready for implementation at IMO and other feasible VOs. (ii) Results from the comparison of seismic wave-velocity changes and anisotropy. Their interpretation with the support of preliminary strain-field modeling based on GPS data, in the attempt to identify changes in rock properties indicative of pre-eruptive unrest. A report.