Volcano Hazards are of great contemporary environmental concern. This book comprises about half the papers and posters presented at a symposium on Volcanic Hazards-Prediction and Assessment, which was part of the International Volcanological Congress held in New Zealand. The wide range of geological, geophysical, geochemical, and remote sensing techniques used in assessing hazards and monitoring volcanoes is demonstrated in two parts, the first dealing mainly with Hazard Assessment, and the second mostly with Monitoring. Special attention is devoted to the question of how surveillance of both active and inactive volcanoes can be carried out in different parts of the world. This compilation will prove useful not only for researchers in the field, but also for anyone required to deal with practical aspects of public safety in volcanic emergencies.