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. Geological Survey. The series started with a 4.6 magnitude quake seconds before the larger one, which the USGS previously reported as having magnitude of 5.1.
