Alaska’s Redoubt Volcano is erupting explosively for a fifth time since 10:38 p.m. local time Sunday evening (2:38 a.m. Eastern time). Subsequent eruptions occurred at 11:02 p.m., 12:14 a.m., 1:39 a.m. and 4:37 a.m. The U.S. Geological Survey’s Alaska Volcano Observatory estimates the initial explosion sent ash up to 50,000 feet in the air. The ash appears to be heading north away from Anchorage. Alaska Airlines has canceled flights, according to the Associated Press.

A spectacular footage of an underwater volcano erupting near Tonga. The eruption began Monday after a series of earthquakes near Tonga (a 170-island archipelago between Australia and Tahiti). Scientists sailed on Thursday to inspect an undersea volcano that has been erupting for days near Tonga, shooting smoke, steam and ash thousands of feet into the sky above the South Pacific ocean.