The Hawaiian Volcano Observatory says Mauna Loa, the largest active volcano on the planet, is in a state of heightened unrest but is not erupting and there are no signs of imminent eruption. Last week, Hawaii Volcanoes National Park closed the Mauna Loa summit backcountry until further notice, calling it a precautionary measure amid “elevated seismic activity.” The observatory said the heightened unrest began in mid-September. The volcano last erupted in 1984. Since 1843, it has erupted 33 times, with the time between eruptions ranging from months to decades.
