An advisory for ashfall - which can contaminate water supplies, kill vegetation and irritate the lungs - was in effect for the surrounding area overnight but has since been lifted. "Based on past events, the early stages of a Mauna Loa eruption can be very dynamic and the location and advance of lava flows can change rapidly," the USGS said. If the eruption migrates beyond the walls of the summit caldera, lava flows could "move rapidly downslope", it added. According to the USGS, Mauna Loa ha...