Mauna Loa, the largest active volcano in the world, has begun to erupt in Hawaii, the U.S. Geological Survey and other authorities said, prompting officials warning people living on Hawaii’s Big Island to be ready in the event of a worst-case scenario. The eruption started late Sunday at about 11:30 p.m. HST in Moku‘āweoweo, the summit caldera of Mauna Loa in Hawaii Volcanoes National Park, according to a USGS Hawaiian Volcano Observatory alert. The eruption had remained confined to the summit caldera early Monday, but USGS Volcanoes and the Hawaii Emergency Management Agency later reported some overflowing on the southwest portion. Shortly before 12:20 p.m. EST (7:20 a.m. HST) USGS Volcanoes announced the volcano's eruption had moved to the northeast rift zone, with lava flows heading downslope to the north. Visit the link in bio to read more about where the lava is flowing and what areas are impacted.