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tiny earthquake scared the **** out of me ...
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Solstice Project's Alt
Doomheim
#61 - 2013-09-22 17:31:33 UTC
baltec1 wrote:
The defences would have held in most places. The problem was nobody expected the entire east coast to sink 3 to 5 meters. This left the defences too low and were over topped.

What should they do ... encapsulate themselves ? :O

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Grimpak
Aliastra
Gallente Federation
#62 - 2013-09-22 17:35:48 UTC
Solstice Project's Alt wrote:
mag ?
not richter ?

I have to look that one up.

Richter scale measures up magnitude ("mag"). there are other, more subjective, scales out there, but richter is good enough to measure up how destructive an earthquake is.

quick (and scary) trivia, richter scale is logarithmic, meaning that the energy curve steepness only gets bigger and bigger, since each level is about 10x stronger than the previous.

oh and richer scale is open, it doesn't have a theoretical ceiling.

[img]http://eve-files.com/sig/grimpak[/img]

[quote]The more I know about humans, the more I love animals.[/quote] ain't that right
Krixtal Icefluxor
INLAND EMPIRE Galactic
#63 - 2013-09-22 18:30:09 UTC
Solstice Project's Alt wrote:
Krixtal Icefluxor wrote:
She's still kickin' it.
This amuses me ...

She's at the Opernball, which is in Vienna, where i live. ^_^


Yeah. That very picture is from there.

"He has mounted his hind-legs, and blown crass vapidities through the bowel of his neck."  - Ambrose Bierce on Oscar Wilde's Lecture in San Francisco 1882
Krixtal Icefluxor
INLAND EMPIRE Galactic
#64 - 2013-09-22 18:32:09 UTC  |  Edited by: Krixtal Icefluxor
Grimpak wrote:


quick (and scary) trivia, richter scale is logarithmic, meaning that the energy curve steepness only gets bigger and bigger, since each level is about 10x stronger than the previous.




Yeah. the difference between a 3 and a 4 isn't much, but the difference between 4 and 5 is frightening !

"He has mounted his hind-legs, and blown crass vapidities through the bowel of his neck."  - Ambrose Bierce on Oscar Wilde's Lecture in San Francisco 1882
Solstice Project's Alt
Doomheim
#65 - 2013-09-22 18:49:24 UTC
Grimpak wrote:
Solstice Project's Alt wrote:
mag ?
not richter ?

I have to look that one up.

Richter scale measures up magnitude ("mag"). there are other, more subjective, scales out there, but richter is good enough to measure up how destructive an earthquake is.

quick (and scary) trivia, richter scale is logarithmic, meaning that the energy curve steepness only gets bigger and bigger, since each level is about 10x stronger than the previous.

oh and richer scale is open, it doesn't have a theoretical ceiling.
That's some scary **** ...

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Rhivre
TarNec
Invisible Exchequer
#66 - 2013-09-22 19:22:34 UTC  |  Edited by: Rhivre
Actually, its not the energy that is 10 times bigger, it makes the ground move 10 times more as you go from 4 to 5, however
the energy is actually 32 times greater, because the actual equation is:

Log(E) = 4.8 + 1.5 * M

Where E = Energy, and M = Magnitude on the Richter scale

10^1.5 = 32

Also, the reason it felt much bigger than the other quakes you get in your area is because it was a very shallow quake (around 13km) and fairly close to where everyone lives.

Fluffy Bunny Pic!

Solstice Project's Alt
Doomheim
#67 - 2013-09-22 20:00:11 UTC
baltec1 wrote:
The defences would have held in most places. The problem was nobody expected the entire east coast to sink 3 to 5 meters. This left the defences too low and were over topped.
I have missed this.

Why did it sink in the first place ?
And at which moment in time did it sink ?

I can only assume that it either sank due to the weight of the water,
or underlying material got soaked away. (but how ? how dense was the underground ?)

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Rhivre
TarNec
Invisible Exchequer
#68 - 2013-09-22 20:05:46 UTC  |  Edited by: Rhivre
it moved because the plate shifted, and it was actually a 20m displacement in some places. (Although I have seen data which, annoyingly I cant track down again atm, showing up to 30m displacement)

http://earthquake.usgs.gov/earthquakes/world/japan/Japan-TohokuM9.0EQ-Mar11_2011_prelim_geodetic_slip_Figures/slip-results.jpg

The tsunami was due to the vertical displacement of the plate (This is the cause of Tsunamis, although, we tend to call everything a Tsunami, even if it is triggered by a landslide, like the large one after Krakatoa, which was due to displacement of material into the ocean, not an earthquake)

Fluffy Bunny Pic!

Solstice Project's Alt
Doomheim
#69 - 2013-09-22 20:09:23 UTC
Rhivre wrote:
it moved because the plate shifted, and it was actually a 20m displacement in some places. (Although I have seen data which, annoyingly I cant track down again atm, showing up to 30m displacement)

http://earthquake.usgs.gov/earthquakes/world/japan/Japan-TohokuM9.0EQ-Mar11_2011_prelim_geodetic_slip_Figures/slip-results.jpg

The tsunami was due to the vertical displacement of the plate (This is the cause of Tsunamis, although, we tend to call everything a Tsunami, even if it is triggered by a landslide, like the large one after Krakatoa, which was due to displacement of material into the ocean, not an earthquake)
Now i'm wondering if my house moved a bit ...

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Rhivre
TarNec
Invisible Exchequer
#70 - 2013-09-22 20:19:59 UTC
Your house is not on a subduction zone :)

Most of the movement where you are is left to right, not up and down.

Fluffy Bunny Pic!

Solstice Project's Alt
Doomheim
#71 - 2013-09-22 20:28:48 UTC  |  Edited by: Solstice Project's Alt
Rhivre wrote:
Your house is not on a subduction zone :)

Most of the movement where you are is left to right, not up and down.

The waves definitely not feel "left and righ".

I could determine the general direction they where coming from,
and it felt like moving up and down in short bursts...
/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_/^\_
(sine wave)


Btw, i was 28km from the epicenter.

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Rhivre
TarNec
Invisible Exchequer
#72 - 2013-09-22 20:30:44 UTC  |  Edited by: Rhivre
Yes, thats because the Rayleigh and Love waves move in that direction, but, the actual fault movement does not have to be.

http://en.wikipedia.org/wiki/Rayleigh_wave

http://en.wikipedia.org/wiki/Love_Wave

Those are the surface waves which do the damage during an earthquake, the better known P and S waves are not the primary cause of damage.

Also, this is a fairly cool BBC doc about earthquakes. 10 things about earthquakes

Fluffy Bunny Pic!

Grimpak
Aliastra
Gallente Federation
#73 - 2013-09-22 21:03:41 UTC  |  Edited by: Grimpak
Rhivre wrote:
Actually, its not the energy that is 10 times bigger, it makes the ground move 10 times more as you go from 4 to 5, however
the energy is actually 32 times greater, because the actual equation is:

Log(E) = 4.8 + 1.5 * M

Where E = Energy, and M = Magnitude on the Richter scale

10^1.5 = 32

Also, the reason it felt much bigger than the other quakes you get in your area is because it was a very shallow quake (around 13km) and fairly close to where everyone lives.


I stand corrected.

well, in the end it doesn't matter. all that matters is, anything 6 and above is bad. anything 8 and above is pretty much a way of [insert your divinity of choice here] say "**** this place in particular."

Solstice Project's Alt wrote:
Rhivre wrote:
it moved because the plate shifted, and it was actually a 20m displacement in some places. (Although I have seen data which, annoyingly I cant track down again atm, showing up to 30m displacement)

http://earthquake.usgs.gov/earthquakes/world/japan/Japan-TohokuM9.0EQ-Mar11_2011_prelim_geodetic_slip_Figures/slip-results.jpg

The tsunami was due to the vertical displacement of the plate (This is the cause of Tsunamis, although, we tend to call everything a Tsunami, even if it is triggered by a landslide, like the large one after Krakatoa, which was due to displacement of material into the ocean, not an earthquake)
Now i'm wondering if my house moved a bit ...

considering that the earth's orbit was affected by that quake, everybody's home actually moved a bit

[img]http://eve-files.com/sig/grimpak[/img]

[quote]The more I know about humans, the more I love animals.[/quote] ain't that right
Solstice Project's Alt
Doomheim
#74 - 2013-09-23 00:18:06 UTC
Rhivre wrote:
Yes, thats because the Rayleigh and Love waves move in that direction, but, the actual fault movement does not have to be.

http://en.wikipedia.org/wiki/Rayleigh_wave

http://en.wikipedia.org/wiki/Love_Wave

Those are the surface waves which do the damage during an earthquake, the better known P and S waves are not the primary cause of damage.

Also, this is a fairly cool BBC doc about earthquakes. 10 things about earthquakes

I will watch this !
Cheers ! :D


Grimpak wrote:
considering that the earth's orbit was affected by that quake, everybody's home actually moved a bit
This reminds me of something.

I believe you mean to say that the earths axis changed ?

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Garandras
The Scope
Gallente Federation
#75 - 2013-09-23 03:14:34 UTC
Solstice Project's Alt wrote:

I believe you mean to say that the earths axis changed ?


It did change..

by a really tiny fraction..


would put up a link but i'm too lazy to google right now =D
Graygor
Federal Navy Academy
Gallente Federation
#76 - 2013-09-23 04:08:20 UTC
Garandras wrote:
Solstice Project's Alt wrote:

I believe you mean to say that the earths axis changed ?


It did change..

by a really tiny fraction..


would put up a link but i'm too lazy to google right now =D


Same thing happened in Thailand back when they had their tsunami too.

"I think you should buy a new Mayan calendar. Mine has muscle cars on it." - Kenneth O'Hara

"I dont think that can happen, you can see Gray has his invuln field on in his portrait." - Commissar "Cake" Kate
Rain6638
GoonWaffe
Goonswarm Federation
#77 - 2013-09-23 05:40:48 UTC
by the way... my desk could support the house, I'm pretty sure.

someone's comment about a lack of warning made me consider where I'd put myself if it seemed like things would get really bad...

this desk is so heavy, we've been unable to move it.

might help one's peace of mind to figure out where to go in the event of a big one

[ 2013.06.21 09:52:05 ] (notify) For initiating combat your security status has been adjusted by -0.1337
Rhivre
TarNec
Invisible Exchequer
#78 - 2013-09-23 05:52:23 UTC
Solstice Project's Alt wrote:


I believe you mean to say that the earths axis changed ?


It did, a little, as with all major earthquakes:

Eeep! Microseconds!

Fluffy Bunny Pic!