A magnitude 5.7 earthquake struck Mauna Loa on the Big Island Friday. The earthquake, which didn’t cause a tsunami and which the U.S. Geological Survey initially reported as magnitude 6.3, was centered on Mauna Loa’s southern flank at a depth of 23 miles, slightly less than a mile and a half southwest of Pahala. The earthquake struck after 10 a.m. local time, less than two hours before an unrelated quake with a preliminary magnitude of 4.6 shook Southern California.
