Terrific explanation, Mike.
I wish I had waited to post the above, lol. You are our Bill Clinton, "Explainer-in-Chief", lol.
edit on 1/5/2013 by Olivine because:
(no reason given)
7.7 Quake Just Hit SE Alaska High on the Cascadia Subduction Zone, page 5
reply posted on 5-1-2013 @ 11:34 AM by The Undertaker
reply to post by Rockbeard
Nice to see a fellow Sitkan on here, I thought I was the only one. We still have a house on Baranoff I. and three years ago when we purchased a Earthquake rider on our insurance policy our agent laughed at us. He asked if we knew something they didn't because we were about the only ones he knew of that had Earthquake Insurance. Who's laughing now Carl? Anyway Rockbeard, I'm pretty sure I know who you are so say hello to your Dad for me.
After speaking with some friends on the rock, it was a real learning experience for them. Some were ready and had their BOB's ready, others were scrambling up to higher ground with nothing but their PJ's on. Everyone was "shaken Up"
to say the least, and I'm so glad all is well. I'm
wondering how many will get Earthquake Insurance now?
Nice to see a fellow Sitkan on here, I thought I was the only one. We still have a house on Baranoff I. and three years ago when we purchased a Earthquake rider on our insurance policy our agent laughed at us. He asked if we knew something they didn't because we were about the only ones he knew of that had Earthquake Insurance. Who's laughing now Carl? Anyway Rockbeard, I'm pretty sure I know who you are so say hello to your Dad for me.
After speaking with some friends on the rock, it was a real learning experience for them. Some were ready and had their BOB's ready, others were scrambling up to higher ground with nothing but their PJ's on. Everyone was "shaken Up"
to say the least, and I'm so glad all is well. I'm
wondering how many will get Earthquake Insurance now?
reply posted on 5-1-2013 @ 11:40 AM by TrueAmerican
reply to post by Olivine
Yes, the lack of quakes in that region is concerning on a number of levels. First it may indicate why such huge quakes have occurred there before. The stress accumulates in the locked zone, and when it finally goes, it goes bigtime. All the geological evidence, as Mike has been pointing out, supports this- so it really puts into perspective more of the many factors involved.
Perhaps what we are seeing are the telltale signs, with the stress relieving first at the extremities of the fault. Again, that is concerning in itself because now across the entire fault, the mid portion you speak of will likely bear and be loaded with additional stress.
But hey, maybe all these quakes are good, and we have another century or two like Mike says.
As to today's quake, pretty sure we won't see much more of a drop in magnitude. That thing rang the earth like a bell for a couple hours, as 7.5's will. It had all the hallmarks and signature of at least a 7.3, on a bad day. The wavelength measurements alone of the S-waves supports 7.3 to 7.5 easily. In spectro mode I saw those plainly.
EDIT: and yup, even LDEO agrees this was a 7.5:
2013 1 5 8 58 32.0 55.75 -135.25 33.0 7.5 OFF COAST OF SOUTHEASTERN ALASKA
www.ldeo.columbia.edu...
Pretty much done deal once they post, and if it drops (unusual for them) it MIGHT drop up to .2 points max.
Yes, the lack of quakes in that region is concerning on a number of levels. First it may indicate why such huge quakes have occurred there before. The stress accumulates in the locked zone, and when it finally goes, it goes bigtime. All the geological evidence, as Mike has been pointing out, supports this- so it really puts into perspective more of the many factors involved.
Perhaps what we are seeing are the telltale signs, with the stress relieving first at the extremities of the fault. Again, that is concerning in itself because now across the entire fault, the mid portion you speak of will likely bear and be loaded with additional stress.
But hey, maybe all these quakes are good, and we have another century or two like Mike says.
As to today's quake, pretty sure we won't see much more of a drop in magnitude. That thing rang the earth like a bell for a couple hours, as 7.5's will. It had all the hallmarks and signature of at least a 7.3, on a bad day. The wavelength measurements alone of the S-waves supports 7.3 to 7.5 easily. In spectro mode I saw those plainly.
EDIT: and yup, even LDEO agrees this was a 7.5:
2013 1 5 8 58 32.0 55.75 -135.25 33.0 7.5 OFF COAST OF SOUTHEASTERN ALASKA
www.ldeo.columbia.edu...
Pretty much done deal once they post, and if it drops (unusual for them) it MIGHT drop up to .2 points max.
edit on Sat Jan 5th 2013 by TrueAmerican because: (no reason given)
reply posted on 5-1-2013 @ 11:50 AM by JustMike
reply to post by Olivine
I'm also slowly developing his gray hair...
Back to the quake... I was wondering if a downgrade might occur, because a lot of the stations reporting in had that quake at somewhat less than 7.5. So, I guess we'll see. I mean, to take it down below say a 7.0 would be a massive downgrade in terms of energy release, so I'm dubious if they'd move it down as low as (say) 6.9, but okay, they might go down to 7.1 or 7.2.
However, the quake from October 28 2012 finally got upgraded from 7.7 to 7.8, which really surprised me. At least, the tectonic summary you linked to from USGS refers to it as a 7.8. And I'm pretty certain it wasn't upgraded during the week that it showed on the main maps. Earthquakes Canada still lists it as 7.7, though. (Readers, just scroll down in the Canada list till you find the mag 7.7 of Oct 28.)
For anyone who might think that a 0.1 difference in magnitude in the 7 range is no big deal, a mag 7.7 releases as much energy as about 350 mag 6.0 quakes, but a mag 7.8 releases about 500 times as much energy as a mag 6.0.
If you got hit by a fairly shallow mag 6 quake, you'd know about it!
So imagine what a difference the energy equivalent of 150 magnitude 6.0
quakes can mean!
So when it gets up into the higher magnitude ranges, the small looking differences are not really so minor in terms of the energy involved. That's why we fuss over them.
I'm also slowly developing his gray hair...
Back to the quake... I was wondering if a downgrade might occur, because a lot of the stations reporting in had that quake at somewhat less than 7.5. So, I guess we'll see. I mean, to take it down below say a 7.0 would be a massive downgrade in terms of energy release, so I'm dubious if they'd move it down as low as (say) 6.9, but okay, they might go down to 7.1 or 7.2.
However, the quake from October 28 2012 finally got upgraded from 7.7 to 7.8, which really surprised me. At least, the tectonic summary you linked to from USGS refers to it as a 7.8. And I'm pretty certain it wasn't upgraded during the week that it showed on the main maps. Earthquakes Canada still lists it as 7.7, though. (Readers, just scroll down in the Canada list till you find the mag 7.7 of Oct 28.)
For anyone who might think that a 0.1 difference in magnitude in the 7 range is no big deal, a mag 7.7 releases as much energy as about 350 mag 6.0 quakes, but a mag 7.8 releases about 500 times as much energy as a mag 6.0.
If you got hit by a fairly shallow mag 6 quake, you'd know about it!
So imagine what a difference the energy equivalent of 150 magnitude 6.0
quakes can mean! So when it gets up into the higher magnitude ranges, the small looking differences are not really so minor in terms of the energy involved. That's why we fuss over them.
edit on 5/1/13 by JustMike because: (no reason given)
reply posted on 5-1-2013 @ 12:07 PM by Olivine
The Back Projections are available for today's earthquake.
The back projections model the earth rupture based on P-wave energy, using 3 different arrays from the Global Seismic Network.
You'll just need to click the "play" arrow directly under the main image. (It's just above the "Download 213.7kb" link).
This link shows the vertical GMV (Ground Motion Visualization) across the USArray. It's really interesting to watch the waves ripple across America--they use red for upward motion and blue for down--it's patriotic.
The back projections model the earth rupture based on P-wave energy, using 3 different arrays from the Global Seismic Network.
You'll just need to click the "play" arrow directly under the main image. (It's just above the "Download 213.7kb" link).
This link shows the vertical GMV (Ground Motion Visualization) across the USArray. It's really interesting to watch the waves ripple across America--they use red for upward motion and blue for down--it's patriotic.
edit on 1/5/2013 by
Olivine because: add another link--it's what I do best, hehe
reply posted on 5-1-2013 @ 12:35 PM by Char-Lee
reply to post by TrueAmerican
Three days ago I saw weird clouds here on the West Coast of Ca unlike any I normally see it lasted most of the day.
Looking online I found people were calling the same type clouds "earthquake clouds" and that they according to one scientist can portend an earthquake from days to average of 30 days to a few months.
I am waiting to see.
Interesting description here can't be copy pasted
Notice they show China actually predicted a quake by these clouds.
www.terraresearch.net...
Clouds were toward the So end of the plate at the CA/Or border, there were very weird clouds again yesterday but not like the first "snake" cloud>
Three days ago I saw weird clouds here on the West Coast of Ca unlike any I normally see it lasted most of the day.
Looking online I found people were calling the same type clouds "earthquake clouds" and that they according to one scientist can portend an earthquake from days to average of 30 days to a few months.
I am waiting to see.
Interesting description here can't be copy pasted
Notice they show China actually predicted a quake by these clouds.
www.terraresearch.net...
Clouds were toward the So end of the plate at the CA/Or border, there were very weird clouds again yesterday but not like the first "snake" cloud>
edit on 5-1-2013 by Char-Lee because: (no reason given)
edit on 5-1-2013 by Char-Lee because: (no
reason given)
reply posted on 5-1-2013 @ 01:16 PM by Char-Lee
Originally posted by JustMike
reply to post by TrueAmerican
If it were to unzip along the entire length then it will be a very bad day.That's one very long zone, so it could have intense shaking for up ten minutes and it could peak out in the low to mid 9 range.
As for the potential tsunamis, the worry there is that there could be several. While that's pretty typical, some could overlap and cumulate into larger ones.
I suspect this might have happened with some previous ones. Hard to imagine how else they could get a 30 metre high tsunami in places otherwise -- even allowing for topographical variations.
Mate, I hope you'll be a very old man (at least) before that happens. In which case I'd likely have to be the oldest man on Earth. But if it'll hold off for a few more decades and just twitch a little with 7s from time to time to keep people alert and practised with their drills, that would be help.
edit on 5/1/13 by JustMike because: (no reason given)
Our alert siren went off a few weeks ago and there was no notice of a drill, we checked the TV and no emergency broadcast and we went back to eating breakfast as the siren waled...only later did I remembered they said it would only be a 12 min or so warning if the underwater slide area offshore went! Probably would not reach the broadcasting stage..Don't think our community is ready at all!
reply posted on 5-1-2013 @ 01:29 PM by Char-Lee
Originally posted by The Undertaker
reply to post by Rockbeard
Nice to see a fellow Sitkan on here, I thought I was the only one. We still have a house on Baranoff I. and three years ago when we purchased a Earthquake rider on our insurance policy our agent laughed at us. He asked if we knew something they didn't because we were about the only ones he knew of that had Earthquake Insurance. Who's laughing now Carl? Anyway Rockbeard, I'm pretty sure I know who you are so say hello to your Dad for me.
After speaking with some friends on the rock, it was a real learning experience for them. Some were ready and had their BOB's ready, others were scrambling up to higher ground with nothing but their PJ's on. Everyone was "shaken Up"
They offered us earthquake insurance, added to our policy it would be 1,400.00 more a year, we can't afford it.
reply posted on 5-1-2013 @ 02:00 PM by gemdog
Originally posted by Char-Lee
reply to post by TrueAmerican
Three days ago I saw weird clouds here on the West Coast of Ca unlike any I normally see it lasted most of the day.
Looking online I found people were calling the same type clouds "earthquake clouds" and that they according to one scientist can portend an earthquake from days to average of 30 days to a few months.
I am waiting to see.
Interesting description here can't be copy pasted
Notice they show China actually predicted a quake by these clouds.
www.terraresearch.net...
Clouds were toward the So end of the plate at the CA/Or border, there were very weird clouds again yesterday but not like the first "snake" cloud>
edit on 5-1-2013 by Char-Lee because: (no reason given)edit on 5-1-2013 by Char-Lee because: (no reason given)
Im in the SF bay area, right on the Hayward fault, and I saw the same clouds, it kinda freaked me out. Ive only seen them a few times in several years, and last week they started in the morning and lasted all day, all over the sky, right above the faultline. I thought "oh, pretty!" then I thought "earthquake clouds, oh, sh*t."
/
reply posted on 5-1-2013 @ 02:23 PM by whatup
reply to post by TrueAmerican
I was on the northern tip of Vancouver Island when the 7.5 earthquake hit. I was sleeping like a baby. I did post a few days ago that I thought bigger ones were coming after the 3.9 just a while back...I was right!! It is always good to be prepared.
I was on the northern tip of Vancouver Island when the 7.5 earthquake hit. I was sleeping like a baby. I did post a few days ago that I thought bigger ones were coming after the 3.9 just a while back...I was right!! It is always good to be prepared.
reply posted on 5-1-2013 @ 02:43 PM by ItDepends
reply to post by JustMike
Thanks for all the updates, and I do hope everyone is safe. That area and the whole pacific 'ring of fire' area has seen a recent increase in activity. I am attaching a site that I use as reference on a daily basis. It is reporting two major quakes near Alaska over the last 11 hours. If you click on the orange spots it gives you a brief discription. In the Alaska area you can see the two overlayed on each other you just have to carefully scroll your cursor over to see the first and second one. Then if you scroll down the page you will see all of the current and active earthquakes worldwide.
Thought this would be helpful information.
Live Earthquakes Map
Edit: It looks like the map (real time) was just updated to show a 5.4 magnitude in that same area.
Best regards to everyone!!
Thanks for all the updates, and I do hope everyone is safe. That area and the whole pacific 'ring of fire' area has seen a recent increase in activity. I am attaching a site that I use as reference on a daily basis. It is reporting two major quakes near Alaska over the last 11 hours. If you click on the orange spots it gives you a brief discription. In the Alaska area you can see the two overlayed on each other you just have to carefully scroll your cursor over to see the first and second one. Then if you scroll down the page you will see all of the current and active earthquakes worldwide.
Thought this would be helpful information.
Live Earthquakes Map
Edit: It looks like the map (real time) was just updated to show a 5.4 magnitude in that same area.
Best regards to everyone!!
edit on 5-1-2013 by ItDepends because: update of information
reply posted on 5-1-2013 @ 03:44 PM by alysha.angel
earthquake.usgs.gov...
since the 7.5 mag quake hit , so far we v got 14 quakes in total t the smallest of which is a mag 3.5
to me it looks like there should be more aftershocks ... tho i could be wrong ...
since the 7.5 mag quake hit , so far we v got 14 quakes in total t the smallest of which is a mag 3.5
to me it looks like there should be more aftershocks ... tho i could be wrong ...
MAG UTC DATE-TIME y/m/d h:m:s LAT deg LON deg DEPTH km Region MAP 4.2 2013/01/05 20:43:17 55.473 -135.318 7.7 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 3.9 2013/01/05 19:53:22 55.570 -135.074 5.6 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 4.4 2013/01/05 15:41:43 55.622 -135.154 9.9 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 4.0 2013/01/05 15:32:15 55.485 -134.904 10.0 SOUTHEASTERN ALASKA MAP 3.5 2013/01/05 13:45:14 55.412 -135.034 10.0 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 5.1 2013/01/05 12:28:30 55.235 -134.527 9.8 SOUTHEASTERN ALASKA MAP 3.7 2013/01/05 12:24:44 55.593 -135.124 14.9 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 3.8 2013/01/05 12:05:52 55.896 -135.455 10.0 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 4.0 2013/01/05 11:39:37 55.520 -135.087 9.9 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 4.8 2013/01/05 10:11:16 55.759 -135.451 7.0 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 4.2 2013/01/05 09:41:25 55.736 -135.211 16.2 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 4.5 2013/01/05 09:32:08 55.102 -134.634 9.2 SOUTHEASTERN ALASKA MAP 4.7 2013/01/05 09:27:20 55.541 -135.252 9.9 OFF THE COAST OF SOUTHEASTERN ALASKA MAP 7.5 2013/01/05 08:58:19 55.368 -134.621 9.8 SOUTHEASTERN ALASKA
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