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Hawaii's Mauna Loa, largest active volcano on planet, in 'state of heightened unrest'
A deserted beach at the edge on an old Mauna Loa lava flow is viewed on December 16, 2016, in this aerial photo taken along the Kona Kohala Coast, Hawaii. (Photo by George Rose/Getty Images) A magnitude 5.0 earthquake was the strongest of a series of temblors that struck Friday on Hawaii's Mauna Loa, the largest active volcano on the planet that scientists say is in a "state of heightened unrest."Smaller aftershocks followed, according to the U.S.