Earthquake magnitude 8+ and tsunami The US?

**Orbz** · 05-28-2011, 12:06 PM

Just found this.

Translated from Russian Google Translate

According to experts Laboratory of tectonic activity and underwater mapping of the University of Oregon, a new earthquake with magnitude greater than 8 can be expected in the immediate vicinity of the coast of the United States.

Don`t know if the Russians exaggerates, but found this that confirms some of it Pacific Northwest faces nearly identical risks to Japanese quake | News & Research Communications | Oregon State University

**bart5050** · 05-28-2011, 12:33 PM

The Cascadia fault in the Pacific Northwest coast of the US has been extensivly studied.
Ample evidence in the geological record that it has produced large quakes and tsunamis.
So it is likely that it will do so again.
As to when and how big, we don't know enough about tectonics to know.
Too many variables.

Don't remember the exact date, but it produced a substantial quake in the 1700's.
The area had a low population density then, so little effect on human infrastructure.
Now cities and more people mean quakes equivilent to past events are of more consequence.

It is a subduction fault.
These are the type that can produce megathrust quakes and tsunamis.

**Orbz** · 05-28-2011, 01:28 PM

The first link to the Russian site did no work properly. I hope this is better Google Oversæt

I think that this is a good reason to be a bit worried

The last time a major earthquake in this area occurred over 300 years ago. Since megazemletryaseniya occur with a frequency of about once every 240 years, then, according to calculations of scientists, aftershocks with magnitude greater than 8 should be expected in the coming years with a probability of 45%, and a nine earthquake - with a probability of 15%.

**Orbz** · 05-28-2011, 01:35 PM

Cascadia subduction zone Cascadia subduction zone - Wikipedia, the free encyclopedia

**lemax** · 05-28-2011, 02:38 PM

There is a Lot of Activity in the Gulf Of California Mexico and up the west Coast to Oregon, that could be the next big one.

**Castle-Bravo354** · 05-28-2011, 09:11 PM

Originally Posted by bart5050

The Cascadia fault in the Pacific Northwest coast of the US has been extensivly studied.
Ample evidence in the geological record that it has produced large quakes and tsunamis.
So it is likely that it will do so again.
As to when and how big, we don't know enough about tectonics to know.
Too many variables.

Don't remember the exact date, but it produced a substantial quake in the 1700's.
The area had a low population density then, so little effect on human infrastructure.
Now cities and more people mean quakes equivilent to past events are of more consequence.

It is a subduction fault.
These are the type that can produce megathrust quakes and tsunamis.

bart.....well said....and since its not very far from shore....the tsunami will hit rather quickly. No doubt you are correct it will happen again....and being prepared is the only defense.

**August** · 05-28-2011, 09:16 PM

Originally Posted by Castle-Bravo354

bart.....well said....and since its not very far from shore....the tsunami will hit rather quickly. No doubt you are correct it will happen again....and being prepared is the only defense.

Castle... this could be the big one that heralds the 21/10/2011 prediction.

**Castle-Bravo354** · 05-28-2011, 09:23 PM

Originally Posted by augustus

Castle... this could be the big one that heralds the 21/10/2011 prediction.

august....if it happens it is an earthquake....and likely a few people will die. However, it take a few other megadisasters to actually be a sign.

I'd take a volcano erupting in a cornfield in Ontario or southern New England as a sign.....not an earthquake in an active seismic zone.