Damaging earthquakes in eastern #NorthAmerica ?
Not so often - but, yes.

On this day in 1944 a damaging M5.8 #earthquake struck near Cornwall, #ON and Massena, #NY. Chimneys came crashing down and many masonry structures were damaged. Felt from Quebec City to New York City to Toronto. Details: http://earthquakescanada.nrcan.gc.ca/historic-historique/events/19440905-en.php… http://adsabs.harvard.edu/full/1945JRASC..39....5H

Seeing through the #ocean...

This is a section of the strike-slip Queen Charlotte Fault (just to the west of Haida Gwaii) that broke 74 years ago tonight during an offshore M8.1 #earthquake.
The Pacific plate slipped ~5 m to the northwest relative to North America (this only took ~2-3 minutes). We can clearly see this #fault on the seafloor thanks to modern seafloor mapping technology. Results of this research show us where the faults are located, how much they have moved and how often.

Large earthquakes in #Canada ?

On this day in 1949, a damaging M8.1 #earthquake (one of the largest ever recorded in #NorthAmerica) struck off #HaidaGwaii. Shaking was so strong that cows were knocked off their feet and a geologist working close to the epicentre could not stand up.
Shaking was felt across most of #BritishColumbia, parts of Alberta, #washington Yukon and Alaska: https://earthquakescanada.nrcan.gc.ca/historic-historique/events/19490822-en.php

Were you rudely awakened by shaking in northwest #Washington at 03:17 this morning?
Hundreds of people were...

That was a M3.8 #earthquake located about 40 km to the east of #Seattle. Shaking was felt to distances of ~100 km.

Details from the #PNSN/USGS:
https://earthquake.usgs.gov/earthquakes/eventpage/uw61939452/executive

More on #PacificNorthwest earthquakes:
https://pnsn.org/outreach/earthquakesources

Are you interested in #Canadian #geoscience?
#earthquakes #landslides #tsunamis #geology #mining #energy #marine geoscience and so much more?

You can find #publications from the #Geological Survey of Canada (established in 1842) via Geoscan.
Search by region, keyword, author and more:

https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/geoscan_e.web

More on the GSC:
https://natural-resources.canada.ca/research-centres-and-labs/geological-survey-canada/17100