Notably, the earthquake also struck near Mt. Katmai, the site of the largest volcanic eruption of the 20th century.
The epicenter was 9 miles south of Mt. Iliamna, another volcano in the area, the Alaska Dispatch News reported.
According to the USGS, the quake hit about 141 miles southwest of Anchorage.
The agency is forecasting "very light damage."
Initial reports say the earthquake was 73 miles deep and its epicenter was near Mt. Iliamna http://t.co/EPHeUWJ3vF pic.twitter.com/nnzMIgI2sl
— Alaska Dispatch News (@adndotcom) July 29, 2015
The earthquake was originally reported as having a magnitude of 6.2, but was later revised up slightly.
USGS reported two minor tremors prior to the 6.3 magnitude one.
6.3 #earthquake in Alaska, 141 miles from Anchorage. @tirey felt shaking 12-15 seconds http://t.co/AfrTOdTnWW pic.twitter.com/mfHnjNly1k
— KING 5 News (@KING5Seattle) July 29, 2015
Although the quake did not strike far from the Redoubt Volcano, there's nothing to suggest activity has been triggered by the quake.
There have been four confirmed eruptions at the volcano since the 20th century began, in 1902, 1966, 1989 and 2009.
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