An offshore earthquake struck in the Gulf of Alaska, west of northern British Columbia, yesterday.

The U.S. Geological Survey initially measured it as a 5.0-magnitude quake but later reassessed it as a 4.6-magnitude tremblor, which occurred at 6:08 p.m. (B.C. time) on August 13.

The epicenter, at a depth of 14 kilometres (nine miles), was located off the coast of the Alaska Pandhandle about 87 kilometres (54 miles) southwest of Elfin Cove, Alaska; 199 kilometres (123 miles) southwest of Juneau, Alaska; and 350 kilometres (271 miles) southwest of Whitehorse, Yukon.

A tsunami warning was not issued for this seismic event.

This earthquake follows a 4.0-magnitude offshore quake that occurred north of Alaska, the Yukon, and the Northwest Territories in the Beaufort Sea at a depth of 10 kilometres (six miles) 10:17 a.m. (B.C. time) on August 12.