4.6 Quake Washington State Border

Magnitude 4.6 earthquake strikes the Washington – British Columbia border area

Last update: November 18, 2011 at 8:03 pm by By 


Earthquake overview : At 05.09 AM on November 18 2011, a moderate earthquake struck the western USA / Canada border. The shallow depth of 11.9 km made it feel as a strong earthquake

Keep this page open or return regularly as we will be back with more details when they become available

Update : Based on the cartography and on condition that the preliminary epicenter is correct, we can report that the epicenter was below a rocky area 3.5 km from a valley with a lot of cultivated fields.

Update Within a radius of 270 km NO important + M5 earthquakes were registered in the recent history

Update : We ask ourselves at Earthquake-Report.com why USGS earthquake maps are stopping at the Canadian border for this earthquake.

Update Theoretical estimates are giving the following MMI numbers for the various cities and villages near the epicenter :
V MMI (moderate shaking) : Omak and Okanogan
II MMI (very weak shaking) : Brewster, Bridgeport, Coulee Dam and Entiat

Update Based on the I Have Felt It reports received from the British Columbia area, the number of people who have felt the earthquake is far more than the expected numbers from USGS.

Update : Following the theoretical calculations from USGS, the earthquake was felt by 1,000 people as a moderate V MMI shaking, 12,000 people have felt a light shaking and 36,000 people a weak to very weak shaking.

to read more, and for updates, go to:    http://earthquake-report.com/2011/11/18/magnitude-4-6-earthquake-strikes-the-washington-british-columbia-border-area/