Magnitude 4.6 earthquake strikes the Washington - British Columbia border area

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
"I have Felt it" Reports --> see below + Let us know "how you have felt this earthquake"
To read the full story as it happened, we advise our readers to start at the lower part of the page (earthquake data).

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 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. GOOGLE+ / FACEBOOK
"I Have Felt It" reports as received by
North Central Washington : felt like a jack hammer out side house
Penticton, BC, Canada : I was woken up at 5:10 am on November 18 2011 by light to moderate shaking for about 15 seconds.
Okanagan Falls, BC, Canada : lying in bed initial shake followed by a light shake-daughter was in top of her bunkbed and bed shook enough to wake her and scared her a bit-first one she experienced-shes 8 lasted about 3 seconds wife was up and felt it too. local time was 5:10 am Pst
Chelan, WA : woke me up at 5:00 am pst
Osoyoos, BC, Canada : 5:10 a.m. woke up to a dull rumble and the bed shaking for about 5 seconds.  Osoyoos BC  Canada.
Chilliwack, BC, Canada : ~5:10 am was already awake, bed really shook, definitely felt!
Castlegar, BC, Canada : Felt it around 5:10 for about 3 to 5 seconds.  Shook my entire house
Rossland, BC, Canada : At +/- 5:10 am PST.
Grand Forks, BC, Canada : I myself didn't feel it - but my neighbor across the street called me - 5:09 a.m. - shook her bed.
Tonasket, WA : Wow !! We just moved here from Escondido,Ca. to get away from that stuff !I thought a car had hit the house.I'll be checking the foundation and water lines------MURF
Osoyoos, BC, Canada : Felt the room vibrate at about 5:00 am. Also heard a loud cracking sound just seconds before the vibrations....lasted about 5 - 7 seconds.
Kelowna, BC, Canada : 05:10 am Nov 18, 2011 - woke up to hear strange noises and the bathroom door shaking on it's runners
Oliver ( Okanagan valley), BC, Canada : I was  asleep when my mom ran downstairs to ask if I felt it then I woke up too
Kamloops, BC, Canada : I was lying in bed and felt it shake at 5:11am.
Omak, WA : It was the strongest shake I have felt hete in omak.  The whole house shook and it felt rolling
Osoyoos, BC, Canada : November 18th 2011 at 05.10 am was awaken by a hard shudder then a moderate swaying motion for about 10-12 seconds.

Most important Earthquake Data:
Magnitude : 4.6
UTC Time : Friday, November 18, 2011 at 13:09:00 UTC
Local time at epicenter : Friday, November 18, 2011 at 05:09:00 AM at epicenter
Depth (Hypocenter) : 11.9 km (7.4 miles)
Geo-location(s) :
8 km (5 miles) WSW (243°) from Riverside, WA
9 km (6 miles) NW (317°) from Omak, WA
12 km (7 miles) N (350°) from Okanogan, WA
59 km from the Canadian / British Columbia border

Links to important maps
USGS Did You Feel It Map
Google satellite map showing the epicenter and the surrounding area.
Historic earthquakes map
Seismic hazard map
Shaking map
Focal mechanism report
Human impact map

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I did feel it – Ik heb het gevoeld – Το έκανα αισθάνεται Yo lo he sentido – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه


  1. We also ask why the USG maps stop at the Canadian border? What kind of sloppy job is this? They include other countries but not Canada? Better fix that! Irresponsible!