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NEWS RELEASE · 5th January 2013
USGS
Location of Nearby Cities

94km (58mi) W of Craig, Alaska
300km (186mi) WNW of Prince Rupert, Canada
326km (203mi) S of Juneau, Alaska
397km (247mi) WNW of Terrace, Canada

Tectonic Summary

The January 5, 2013 M 7.5 earthquake off the west coast of southeastern Alaska occurred as a result of shallow strike-slip faulting on or near the plate boundary between the Pacific and North America plates. At the location of this earthquake, the Pacific plate is moving approximately northwestward with respect to the North America plate at a velocity of 51 mm/yr.

This earthquake is likely associated with relative motion across the Queen Charlotte fault system offshore of British Columbia, Canada, which forms the major expression of the Pacific - North America plate boundary in this region.

The surrounding area of the plate boundary has hosted 8 earthquakes of magnitude 6 or greater over the past 40 years.

In 1949, a M 8.1 earthquake occurred close to the Pacific - North America plate boundary approximately 230 km to the south east of the January 5th earthquake, as a result of strike-slip faulting.

In October of 2012, a M 7.8 earthquake occurred approximately 330 km to the south east of the January 5th event, slightly inboard of the plate boundary, and was associated with oblique-thrust faulting. The latter earthquake was likely an expression of the oblique component of deformation along this plate boundary system.

The January 5th, 2013 earthquake is related to that Haida Gwai earthquake three months previously, and is an expression of deformation along the same plate boundary system.

LIST OF SUBSEQUENT AFTERSHOCKS TO 8:30 AM


4.4 MAGNITUDE AT 07:41:43

4.0 MAGNITUDE AT 07:32:15

5.1 MAGNITUDE AT 04:28:30

4.0 MAGNITUDE AT 03:39:37

4.8 MAGNITUDE AT 02:11:16

4.2 MAGNITUDE AT 01:41:25

4.5 MAGNITUDE AT 01:32:08

4.7 MAGNITUDE AT 01:27:20

7.5 MAGNITUDE AT 00:58:19

View Fake Video Claiming to be of Last Nights Quake Here

Earthquakes in Volcano Alley - Skeena Region
Comment by Regional Earthquakes on 6th January 2013
There are soo many volcano's in the Skeena Region and I hope scientists are going to start monitoring them due to the recent earthquakes...these are some of the volcano's that I know of - Loss Lake, Onion Lake, there is one near the old Kitsumkalum Ski hill...one between Terrace and Prince Rupert and the famous Nass Valley Volcano. There are more, and I prey that an earthquake doesn't wake them up.