One thing that make fear on my mind is the St-Laurence Paleorift . It's start on the northwest side of Greenland , take a turn into the St-Laurence gulf , follow it and slit into 2 majors faults systems
One stay a rift system, that start 50 mile north of Ottawa , take a bath under the great lake , pass Niagara fall and buffalo and connect to an well know fault named the New Madrid .
The other is a serie of supracrustal fault , spliting 100 mile east of Montreal , follow the Richelieu river to the appalachian range , Take a bath to the Atlantic ocean close to Charleston and strike Porto Rico . And collision upper movement fault name The Logan Fault line follow the same
way. This faultd is responsible of the Newest upper movement of the Appalachian range , that strangely , look younger that they should be , i will show you all the faults lines latter on the topic .
Here is the map of the east coast fault line
hpics.li...
Here is a cut of the underground of montreal , you can see the rift fault and the Logan fault , the logan fault is the one that cut the rift fault at the right of the image .
hpics.li...
and here is where the cut is :
hpics.li...
More we get to the north , more the rift is old , Greenland get off from america at the same moment the Himalaya was created
Here is a cut from the underground of Quebec , close to the City of Les Eboulements (remind of the great 1663 Quake)
hpics.li...
And here is where the cut is :
hpics.li...
Other informations , if the rift have to go off (collapse event or not ) The energies will be transmitted from 2 side , the East and the West .
So , the New Madrid and The east coast fault system will get massive stress
here is historical info for all the region on the east coast
Here is Info on the 7.2 grand banks earthquake in 1929
earthquakescanada.nrcan.gc.ca...
And the 7.0 Charlevoix Earthquake in 1663.
earthquakescanada.nrcan.gc.ca...
The 1933 Baffin Bay earthquake
earthquakescanada.nrcan.gc.ca...
1884 east coast Shake
www.gendisasters.com...
East coast quake History and hasard by state :
New York:
earthquake.usgs.gov...
earthquake.usgs.gov...
South Carolina:
earthquake.usgs.gov...
earthquake.usgs.gov...
Vermont :
earthquake.usgs.gov...
earthquake.usgs.gov...
Maine:
earthquake.usgs.gov...
earthquake.usgs.gov...
Virginia:
earthquake.usgs.gov...
earthquake.usgs.gov...
Maryland:
earthquake.usgs.gov...
earthquake.usgs.gov...
North Carolina:
earthquake.usgs.gov...
earthquake.usgs.gov...
District of Columbia:
earthquake.usgs.gov...
earthquake.usgs.gov...
New jersey:
earthquake.usgs.gov...
earthquake.usgs.gov...
Massachusetts:
earthquake.usgs.gov...
earthquake.usgs.gov...
So , it's happened before .
Here is The USGS Earthquake Hasard map
earthquake.usgs.gov...
And now , Some study are made , but very contradictory that said 15% chance of 7.0+ earthquake in Montreal in the next 50 years (Some said it's 5% chance , other said it's imminent .
www.canada.com...


want to create a megaquake in America , you will say , crush the new madrid ? 

Very interesting indeed!!