An earthquake with a preliminary magnitude of 6.3 struck Hawaii early Sunday morning, waking up residents and knocking out power.
The quake occurred at 7:07 a.m. near Kailua-Kona on the west coast of the Big Island of Hawaii. Researchers are still trying to ascertain how many aftershocks struck and how large they were, said Don Blakeman, a geophysicist at the National Earthquake Information Center, part of the U.S. Geological Survey.
The U.S. Geological Survey also reported several aftershocks, including one measuring a magnitude of 5.8. No damage reports were immediately available.
Blakeman said there was no risk of a Pacific-wide tsunami, but a possibility of significant wave activity in Hawaii.
The quake occurred about 155 miles to the southeast of Honolulu, the state capital, in Oahu.