7.7 Quake Just Hit SE Alaska High on the Cascadia Subduction Zone

reply to post by TrueAmerican

It appears the Alaska eathquake had a bell effect at yellowstone as well as a Louisiana sinkhole:

______beforeitsnews/earthquakes/2013/01/yellowstone-sinkhole-jarred-by-7-5-alaskan-earthquake-2447714.html?utm_source=dlvr.it&utm_medium=twitter< br />
I also noticed an unusually high number of quakes worldwide at around the same depth within a 24 hour period, I'm really wondering about the 'bell effect' and worldwide crustal shifts at specific depths. Any feedback about this depth component?

Originally posted by RussianScientists
I'm interested in seeing if Phage was right when he wrote down January 27th. Will a big earthquake strike on or very near that date?

I'm too late into this thread
Phage said this? I missed that.
Hope he's wrong. Was this for the same region?

It's concerning to have two 7.7's
I had my phone with me when the Alaska quake hit. I got the alert, then about half hour later my solar monitor app alerted me to solar flare activity sending off M class flares. I'm wondering if there is any correlation with both events? I tend to think there is but I really don't know.

reply to post by JustMike


Just an update of reported EQ activity on the West Coast of the Northern Hemisphere and the Pacific Ocean approximately 11:20 e.s.t.



Link here for Live EQ
Just scroll over the orange dots for summary information. Then scroll down the page for more detailed specific EQ activity.

Regards, ID

reply to post by TrueAmerican

4.4 - 200km off of Tofino

Originally posted by whatup
reply to post by TrueAmerican

 

4.4 - 200km off of Tofino

earthquake.usgs.gov... here's a link to that 4.4.

I really don't like what I'm seeing west of Van Island and further up north. Big One is on its way.

Vancouver island BC.
M4.4 - 205km W of Tofino, Canada

Event Time:
2013-01-07 03:33:23 UTC
2013-01-06 18:33:23 UTC-09:00 at epicenter
2013-01-06 19:33:23 UTC-08:00 system time

Location:
49.035°N 128.715°W depth=10.0km (6.2mi)

Nearby Cities:
205km (127mi) W of Tofino, Canada
273km (170mi) WSW of Campbell River, Canada
279km (173mi) WSW of Courtenay, Canada
286km (178mi) W of Port Alberni, Canada
398km (247mi) WNW of Victoria, Canada


I didn't. feel it. I'm on the mainland

------------------

TA.
Although close in proximity to each other, are they on the same plates? What could this mean in terms of stresses building up, pushing against each other? What about the Volcanoes?

reply to post by violet


Well, look on the bright side of things...The big quake that happened a while back offshore Vancouver probably relieved any stress built up right there. May not have to worry at all.

As to the 4.4, that spot has been one of the more active spots lately. Better it gives way a little at a time with small quakes than in one big, knock you over backbreaker, right?

reply to post by TrueAmerican

Can small EQ's relieve stress to prevent large ones?

If you look at earthquake statistics in most regions of the world, including California, you will find that for every magnitude 5 earthquake, there are about 10 that have a magnitude of 4, and for each magnitude 4, there are 10 with magnitude 3. Unfortunately, this means there are not enough small earthquakes to relieve enough stress to prevent the large events. In fact, it would take 32 magnitude 5's, 1000 magnitude 4's, or 32,000 magnitude 3's to equal the energy produced in one magnitude 6 event.

Source

reply to post by whatup


I thought I felt some shaking last night.But no one else in the room said anything so I thought it might just be my mind playing tricks on me/large truck passing by etc..

Originally posted by TheWetCoast
reply to post by whatup

 

I thought I felt some shaking last night.But no one else in the room said anything so I thought it might just be my mind playing tricks on me/large truck passing by etc..

Or otherwise known as ATSitus

reply to post by TrueAmerican

Little Quakes Precede A Big One?

Typically, small earthquake swarms have been considered as relieving the stress on a fault. In Italy, only 2 percent of small swarm events had preceded a bigger earthquake, which is why the magnitude-6.3 quake in L'Aquila, Italy, in 2009 came as a surprise even to the seismologists, who now face jail time for downplaying the risk.

But what if there was a way to tell when swarms indicated something more dangerous approaching? Stanford geophysics Professor Paul Segall reporting at the meeting of the American Geophysical Union in San Francisco is using computational models to search for the signature events that may precede a major earthquake. He is relying on data from the Pacific Northwest where the last earthquake to shake the region with an estimated 8.7–9.2 magnitude occurred in 1700 and produced a tsunami that reached Japan. "You have these small events every 15 months or so, and a magnitude 9 earthquake every 500 years. We need to known whether you want to raise an alert every time one of these small events happens," he says. "What our calculations have shown is that ultimately these slow events do evolve into the ultimate fast event, and it does this on a pretty short time scale."

Source




I can't copy this so here is another source about how these quakes raise alarms. Regarding this Alaskan quake

Link

Originally posted by violet

Originally posted by RussianScientists
I'm interested in seeing if Phage was right when he wrote down January 27th. Will a big earthquake strike on or very near that date?

I'm too late into this thread
Phage said this? I missed that.
Hope he's wrong. Was this for the same region?

It's concerning to have two 7.7's
I had my phone with me when the Alaska quake hit. I got the alert, then about half hour later my solar monitor app alerted me to solar flare activity sending off M class flares. I'm wondering if there is any correlation with both events? I tend to think there is but I really don't know.

Here's a link to what Phage wrote about January 27, 2013.
www.abovetopsecret.com...
Phage is a pretty smart cookie.

4.4 205km W of Tofino, Canada 2013-01-07 03:33:23 49.035°N 128.715°W 10.0

That is actually part of the Cascadian Subduction Zone.

reply to post by RussianScientists


Thanks. I recall that thread now. Didn't make a note of any dates.


This 'Zone' that I live in has about a 3 to 500 year cycle of a potentially magnitude 9 earthquake. The last one was in 1700. Depending on which source you read.

Episodic tremor and slip activity on the little Juan De Fuca Plate could trigger a major movement of the plates, causing a mag 9 quake, or so seismologists have been saying for quite some time. They've never really been saying each small quake is releasing pressure but possibly setting the stage for the Juan De Fuca Plate to grind under the North. AmericanPlate in the cascadia subduction zone. Its always moving under it by a 1/4 inch a year or something like that, but one day it will be one sudden massive movement. It's not if but when.

The Pacific Plate is where this Alaskan quake and the Haida ones were situated and the Juan de Fuca is in between this one and the N.American Plate.


I wasn't aware this Alaskan quake was in or near the cascadia subduction zone as the OP. says. Am I wrong?

Coordinates: 45°N 124°W The Cascadia subduction zone (also referred to as the Cascadia fault) is a subduction zone, a type of convergent plate boundary that stretches from northern Vancouver Island to northern California. It is a very long sloping fault that separates the Juan de Fuca and North America plates. Ocean floor is sinking below the continental plate offshore of Washington and Oregon. The North American Plate moves in a general southwest direction, overriding the oceanic plate. The Cascadia Subduction Zone is where the two plates meet.

Wiki



Another Source

reply to post by violet


The two 7.7 quakes were on the Queen Charlotte fault line, but its very close to Cascadia, just north of it.

reply to post by Rezlooper


Ok thanks for clearing that up

And nothing happened.

Aftershocks are still coming...this mag 4.0 the farthest north to date.


Image source is USGS recent quakes.

reply to post by Olivine


Add a second one to today's aftershocks:
4.7 114km W of Craig, Alaska 2013-01-08 13:45:03 55.386°N 134.944°W 9.1
earthquake.usgs.gov...

I'm having a hard time believing there's really been only the main & 17 aftershocks thus far. Are they not listing small aftershocks, or have there just not been any beyond what's listed?