7.7 magnitude quake hits Canada

Oct 28, 2012 | Posted by: roboblogger | Full story: Iol.co.za

A powerful earthquake with a magnitude of 7.7 hit Canada's Pacific coastal province of British Columbia late Saturday, setting off a small tsunami, but there were no immediate reports of injuries or damage, officials said.

Comments
1 - 3 of 3 Comments Last updated Oct 29, 2012
Bruce

Toronto, Canada

#1 Oct 28, 2012
Hun

Port Alberni, Canada

#2 Oct 28, 2012
I was proud of the people of the North Island for the orderly manner in which they handled the evacuation to higher ground.It may have amounted to nothing but it gave insight as to what may happen during the real thing.

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

#3 Oct 29, 2012
Hun wrote:
I was proud of the people of the North Island for the orderly manner in which they handled the evacuation to higher ground.It may have amounted to nothing but it gave insight as to what may happen during the real thing.
Handy to be prepared.

Entire Canada-Alaska border islands right up to Wrangell is a backarc basin with as a result of continued subduction, the ability to create 2004 size or bigger tsunami along the entire length. The convergence rate appears to be the same along the entire backarc basin so the entire length may go at once.

Transcurrent compression due to oblique convergence transports the entire E.Alaska and Haider Gwaii island group NW. with a major pile up @ Wrangell, so the epicentre of a mainstream rebound/long duratio nmercalli X (r/lx) event will be likely at Wrangell once the megathrust goes beyond young's modulus.
Current reports indicate that no major tsunami has occurred in the recent holocne (to 2000Bp), so the area is likely in the intermediate to late stage of recompression.

Eventually the real thing is going to hit so best early warning & that point will be the quake lasting longer than 5 minutes (& the sudden disappearance of communications from the island groups of haider Gwaii through to Wrangell due to the bulk suddenly being washed over.

Also note, a late stage of recompression also exists in the Garibaldi arc (Vancouver island area), running from the S. part of the Queen Charlotte inlet through to Mt.Baker volcano region in the Junction box with Cascadia. This backarc basin also features the driving hotspot of Chilcotin,(wells grey-clearwater volcanic field, with the last of the intracrustal magma squeezed out in recent prehistory. R/lx may hit this bit first and subduction there is direct (NE. with N. America SW.) at about 4.5cm/yr or possibly more. In this part of the world all the Palaeotsunami appear to be derived from Cascadia for the bulk of the late Holocene. Last r/lx there may have been 4000+ years ago; that is a lot of metres! of recompression.

Good to get in practice with tsunami evacuation.

Have a nice day: Ag

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