JUNEAU, Alaska—A magnitude 6.9 earthquake struck off the coast of Alaska early Monday in what the Alaska Earthquake Center called an aftershock of a 8.2 quake from late July. Monday’s earthquake was felt throughout the Alaska Peninsula and Kodiak Island, according to the Alaska Earthquake Center. It occurred about 70 miles east of Chignik, a community of about 90 people on the Alaska Peninsula. Chignik is about 450 miles southwest of Anchorage and 260 miles southwest of Kodiak. The center had not received reports of significant damage but also relies on self-reporting, said seismologist Natalia Ruppert. Jeremy Zidek, a spokesperson for Alaska’s emergency management office, said the office was contacting communities and had no reports of damage so far. The U.S. Geological Survey on Twitter had reported a preliminary magnitude of 6.5 that was later revised to 6.9, which ties another earthquake that hit Alaska in August. The two 6.9 …