Passive Satellite Techniques and Ground-based Investigations for Volcanic Activity Monitoring Preface

Monitoring and studying active volcanoes, investigating their dynamics, analysing emissions and eruptive behaviours have traditionally been motivated by the aim of improving knowledge of volcanic phenomena and related physical processes to protect our environment and population from hazards volcanic eruptions may pose. Advanced observing systems using satellite sensors and ground-based instrumentations are now common tools to monitor volcanic activities and associated hazards. Satellite systems provide global coverage, synoptic view and the required spectral and temporal resolution to investigate both surface parameters (e.g. temperatures) and atmospheric emissions (e.g. volcanic ash), whereas in-situ devices allow for continuous measurements, high accuracy and sub-soil investigation.