Abstract

This paper describes remote sensing measurments of gasses emitted by Galeras volcano in the Colombian Andes prior to its eruption on 14 January 1993. In all, approximately eight hours of observations were made on 9-10 January in the UV and thermal IR. S02 was observed with a dispersive correlation spectrometer (Plumetracker) operating at 310 nm. OCS and CO were observed with a non-dispersive correlation spectrometer (GASCOFIL) operating at 4.8 microns. Preliminary analysis indicates SO2 levels of the order of 100 ppm-m just above the volcano, CO levels of 150 ppm-m and OCS of 6 ppm-m inside the inner cone of the volcano.

© 1993 Optical Society of America