During the beginning of the outburst eruption, thermal emission is dominated by strong, 1–3 μm infrared radiation. It is produced by a large amount of exposed, fresh lava within the fountains at the eruption source vent.
During the initial stages of the volcanic explosion, thermal radiation is dominated by intense, 1–3 μm infrared emissions. The phenomenon is caused by a substantial amount of newly exposed and unweathered lava within the fountains at the eruption's source vent.