Over years, Chiliques has been monitored from space by ASTER imagery. In 2002, the imagery showed evidence of a temperature anomaly on Chiliques, which occasionally reached a scale of . This temperature anomaly may reflect either thermal events in crater lakes or fumarolic activity, although evidence for the occurrence of either is equivocal. Some of the anomalies were observed in the crater and others on the upper slopes of the volcano. This anomaly lasted only a few months.