Update:

A second earthquake struck at 4:14 a.m. Anchorage time (3:14 a.m. Vancouver time) today (May 31).

The U.S. Geological Survey measured it as a 4.6-magnitude quake, at a depth of 37 kilometres (23 miles) in the same area as the previous temblor.

Original article:

An earthquake has just shaken Central Alaska.

It hit at 10:59 p.m. on May 30 Anchorage time (11:59 p.m. Vancouver time).

Both the U.S. Geological Survey (which initially reported it as 6.0-magnitude before reassessment) and the Alaska Earthquake Centre measured it as a 6.1-magnitude seismic event.

The epicentre, at a depth of 58 kilometres (36 miles), was located 77 kilometres (47 miles) north of Chickaloon, Alaska; 129 kilometres (80 miles) northeast of Knik-Fairview, Alaska; and 165 kilometres (102 miles) northeast of Anchorage, Alaska.