Present Status of Researches on Disasters Caused by Volcanic Gases and Prediction of Volcanic Eruption by Chemical Methods

Abstract

This paper consists of six parts : introduction, disasters caused by volcanic gases, precursory chemical phenomena related to eruptions, post-eruptive activity changes and related geochemical changes, continuous chemical monitoring for eruption prediction, and what we have to do for the chemical prediction of eruption. Observed facts which are sometimes inconsistent with each other, and several proposals for the chemical prediction of eruption, especially continuous data acquisition are critically reviewed and discussed. It is emphasized thar the accumulation of the results on continuous observations, laboratory experiments and theoretical considerations should be combined with harmony. Cooperation of geochemistry with seismology, geomagnetic studies. geodesy and experimental petrology is urged.