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Old 4th March 2018, 08:07 AM   #1
Undesired Walrus
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50 metre asteroid hitting the Atlantic ocean

Say an asteroid travelling at an average speed for an asteroid hit broadly the centre of the Atlantic and I was sitting in a beach on the south west tip of the UK. What would I see on that beach in the hours following the impact and what would the wider implications be for earth?
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Old 4th March 2018, 09:46 AM   #2
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Which way are you looking?
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Old 4th March 2018, 09:49 AM   #3
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Originally Posted by Undesired Walrus View Post
Say an asteroid travelling at an average speed for an asteroid hit broadly the centre of the Atlantic and I was sitting in a beach on the south west tip of the UK. What would I see on that beach in the hours following the impact and what would the wider implications be for earth?
Not sure for that, but much more sure for a 500 meter one....
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Old 4th March 2018, 10:19 AM   #4
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Originally Posted by Undesired Walrus View Post
Say an asteroid travelling at an average speed for an asteroid hit broadly the centre of the Atlantic and I was sitting in a beach on the south west tip of the UK. What would I see on that beach in the hours following the impact and what would the wider implications be for earth?
https://impact.ese.ic.ac.uk/ImpactEarth/ImpactEffects/
Summary:

25cm Tsunami arriving 6 hours after impact
45dB sonic boom arriving 1.7 hours after impact (easily heard, not painful)
Otherwise a normal spring day.
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Old 4th March 2018, 10:43 AM   #5
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Ok you see how little I know. Let's say enough size and enough force to cause a devastating tsunami. What would the calculations be for that using that guide and what would I see?
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Old 4th March 2018, 03:54 PM   #6
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Undesired Walrus - This is not a site intended to spoon-feed you. You have the link. Go play with it. If there is something specific you don't understand, ask a question, but don't expect other people to do your work for you.
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Old 4th March 2018, 04:22 PM   #7
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Originally Posted by GodMark2 View Post
https://impact.ese.ic.ac.uk/ImpactEarth/ImpactEffects/
Summary:

25cm Tsunami arriving 6 hours after impact
45dB sonic boom arriving 1.7 hours after impact (easily heard, not painful)
Otherwise a normal spring day.
Oh the humanity!!

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Old 4th March 2018, 04:23 PM   #8
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Originally Posted by WhatRoughBeast View Post
Undesired Walrus - This is not a site intended to spoon-feed you. You have the link. Go play with it. If there is something specific you don't understand, ask a question, but don't expect other people to do your work for you.
relax....
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Old 5th March 2018, 01:28 AM   #9
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I'm more interested in what I'd see visually in terms of the sky turning another colour (?) or what sound I'd hear? Would the tsunami from something like this bear a resemblance to the standard tsunami you see as a result of earthquakes or something more dramatic? Would the birds turn back from the sea? What would I smell?

And finally, what would kill me first?
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Old 5th March 2018, 03:39 AM   #10
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Originally Posted by Undesired Walrus View Post
<snip>

And finally, what would kill me first?

The zombies, I expect. It's almost always the zombies.

You probably won't be able to see them, though, since you were stupid enough to sit there and watch the meteor flash. You'll probably be blind.
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Old 5th March 2018, 10:57 AM   #11
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Originally Posted by Undesired Walrus View Post
I'm more interested in what I'd see visually in terms of the sky turning another colour (?) or what sound I'd hear? Would the tsunami from something like this bear a resemblance to the standard tsunami you see as a result of earthquakes or something more dramatic? Would the birds turn back from the sea? What would I smell?

And finally, what would kill me first?
A 25 cm tsunami? You wouldn't even notice it unless it was an extraordinarily calm day.

What would kill you first? Dehydration or hypothermia, if you just stayed on the beach waiting to die. Otherwise, nothing.
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Old 5th March 2018, 11:08 AM   #12
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That: https://en.wikipedia.org/wiki/Chelyabinsk_meteor

Was caused by a 20 meter meteor. Just for an idea of the scale of damage.
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Old 5th March 2018, 11:15 AM   #13
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Originally Posted by lobosrul5 View Post
That: https://en.wikipedia.org/wiki/Chelyabinsk_meteor

Was caused by a 20 meter meteor. Just for an idea of the scale of damage.

Not a very reliable article.

It doesn't even mention the zombies.
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Old 5th March 2018, 12:30 PM   #14
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Originally Posted by Undesired Walrus View Post
Say an asteroid travelling at an average speed for an asteroid
Average speed relative to what?
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Old 5th March 2018, 01:53 PM   #15
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angle of intersection matters a lot also
the russian meteor was going across the sky at a shallow angle
so in the air longer and slowed more converted speed to heat
so very small fragments and no big impact crater

if one comes strait down it hits alot harder so bigger crater or tidal splash
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Old 5th March 2018, 02:10 PM   #16
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This document suggests an entry speed of 24km/s (the previously linked site suggests using 17 km/s):

http://www2.mae.ufl.edu/~uhk/ASTEROID.pdf

Either way, not too much of an event. Even scaling up to 500m gives magnitude 7 seismic shock, a bang loud enough to break some windows and a ten to 20 foot tsunami.
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Old 5th March 2018, 02:16 PM   #17
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How about this scenario?

https://impact.ese.ic.ac.uk/ImpactEa...&wdepthUnits=1

If the Tsunami wave is 121.0 meters isn't that huge? How would it look in comparison to those videos from the Japanese tsunami?
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Old 5th March 2018, 02:19 PM   #18
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From all what I read a 50m non metallic asteroid would disintegrate while entering Earth atmosphere.

Both composition and size are to take into account.

I'm worried only about 500m+ ones...
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Old 5th March 2018, 02:26 PM   #19
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Originally Posted by Undesired Walrus View Post
If the Tsunami wave is 121.0 meters isn't that huge? How would it look in comparison to those videos from the Japanese tsunami?
Yes that is very huge.

Initially the ocean recedes before tsunami waves arrive. This would be extremely dramatic. From the beach, it would appear as if the ocean vanished. You might not be able to see the water at all without binoculars.

Then it comes.
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Old 5th March 2018, 02:31 PM   #20
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Yeah, with that size, prior to the arriving waves...

It would appear as if someone had opened a drain in the bottom of the ocean and all the water just went away.
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Old 5th March 2018, 02:34 PM   #21
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Originally Posted by William Parcher View Post
Yes that is very huge.

Initially the ocean recedes before tsunami waves arrive. This would be extremely dramatic. From the beach, it would appear as if the ocean vanished. You might not be able to see the water at all without binoculars.

Then it comes.
Thanks. Why?
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Old 5th March 2018, 02:36 PM   #22
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Have you ever seen End Day?

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Old 5th March 2018, 02:42 PM   #23
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Doesn't work sorry.
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Old 5th March 2018, 02:43 PM   #24
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Originally Posted by Undesired Walrus View Post
Thanks. Why?
It's the physics involved in the wave formation and propagation. In order to create a 121 meter tsunami wave the water has to be "taken" from somewhere. It will take all of the water away from the coast or beach.
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Old 5th March 2018, 02:47 PM   #25
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Freaky.

Would the tsunami wave resemble the overly dramatic all-in-one waves from Deep Impact and such or gradually build?
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Old 5th March 2018, 02:52 PM   #26
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It would not likely be one single big wave. It should be numerous waves with the largest not being the first. There could be surprisingly long intervals between waves.
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Old 5th March 2018, 08:26 PM   #27
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Originally Posted by theprestige View Post
Average speed relative to what?
Other average asteroids I would think!!!!
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Old 5th March 2018, 08:43 PM   #28
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Originally Posted by Undesired Walrus View Post
Freaky.

Would the tsunami wave resemble the overly dramatic all-in-one waves from Deep Impact and such or gradually build?
Apparently there are no known historic examples of tsunamis caused by large meteor impacts. There's geologic evidence of some prehistoric impacts maybe.

It could be they behave differently from tsunamis caused by earthquakes.

I kinda doubt it would look like in the movies, and I imagine it would look more like the Japan tsunami or the Indian Ocean tsunami. It's like the ocean just starts rising rather than a wave that looks like something a surfer would ride.
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Old 5th March 2018, 09:01 PM   #29
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Originally Posted by fuelair View Post
Other average asteroids I would think!!!!
Tell me more, o thou expert asteroid consultant.
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Old 6th March 2018, 08:32 AM   #30
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Originally Posted by fuelair View Post
Other average asteroids I would think!!!!
That's a very weird answer.

I would think he was pretty obviously talking it's speed relative to the earth, as that's the value that will actually tell us something about the impact.

I think typical velocities are on the order of tens of km/s, but I can't say anything more specific than that offhand. If you get more than some tens of km/s you get to solar escape velocity, in which case you're not dealing with an object from within our solar system but something interstellar, and that would just be much rarer.

I'm sure someone else knows more than I do, or can actually do a little research.
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Old 6th March 2018, 09:15 AM   #31
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The velocity of the impact will be dependent on whether the Earth is orbiting head on into the asteroid, or whether it is catching us up from behind. The Earth orbits at ~ 30 km/s, so it will make a big difference. Without checking, OK, so I checked! Here is an impact calculator, which tells us that impacts are minimum 11 km/s. 17 km/s average for asteroids. Comets can be a lot faster:
https://impact.ese.ic.ac.uk/ImpactEarth/ImpactEffects/

Unfortunately it doesn't calculate tsunami size! For a 3000 kg m3 rocky asteroid, we can expect it to break up, and it will be an airburst, same as Tunguska.
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Old 6th March 2018, 02:30 PM   #32
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I think it depends on the type of asteroid as to whether it breaks up or not. A solid iron one will not, but one made up of loose stones will.
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Old 6th March 2018, 03:45 PM   #33
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Originally Posted by William Parcher View Post
Yes that is very huge.

Initially the ocean recedes before tsunami waves arrive. This would be extremely dramatic. From the beach, it would appear as if the ocean vanished. You might not be able to see the water at all without binoculars.

Then it comes.
Given the stories from the Boxing Day Tsunami, it was the thing that really struck me. If you see the sea suddenly disappear, run like hell.
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Old 6th March 2018, 03:54 PM   #34
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Originally Posted by Mikemcc View Post
Given the stories from the Boxing Day Tsunami, it was the thing that really struck me. If you see the sea suddenly disappear, run like hell.
That was the old advice. The new one is: start streaming.
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Old 7th March 2018, 07:54 AM   #35
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Originally Posted by Mikemcc View Post
Given the stories from the Boxing Day Tsunami, it was the thing that really struck me. If you see the sea suddenly disappear, run like hell.
Yes, but then Walrus proposed a 121 meter tsunami wave which is very much larger than what occurred in 2004. This could potentially withdraw the ocean for several miles offshore.
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Old 7th March 2018, 08:04 AM   #36
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But his tsunami would originate 30 miles offshore (that's the impact distance), so I'm not too sure how that would work.

And even then, you'd be killed in a number of interesting ways long before the water hit, if I'm reading that page correctly.
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Old 7th March 2018, 08:06 AM   #37
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Originally Posted by WhatRoughBeast View Post
Undesired Walrus - This is not a site intended to spoon-feed you. You have the link. Go play with it. If there is something specific you don't understand, ask a question, but don't expect other people to do your work for you.
Well, that escalated quickly...
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Old 7th March 2018, 08:07 AM   #38
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Originally Posted by lobosrul5 View Post
That: https://en.wikipedia.org/wiki/Chelyabinsk_meteor

Was caused by a 20 meter meteor. Just for an idea of the scale of damage.
If you're sitting below the shockwave, sure. Not if you're on the other end of the ocean.
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Old 7th March 2018, 08:09 AM   #39
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Originally Posted by Undesired Walrus View Post
Freaky.
One of the scariest things one can see, I think. You're on the beach and see the ocean disappear, you know you're dead. I don't think you can reach safe distance in time.
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Old 7th March 2018, 08:10 AM   #40
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Originally Posted by Puppycow View Post
Apparently there are no known historic examples of tsunamis caused by large meteor impacts. There's geologic evidence of some prehistoric impacts maybe.

It could be they behave differently from tsunamis caused by earthquakes.

I kinda doubt it would look like in the movies, and I imagine it would look more like the Japan tsunami or the Indian Ocean tsunami. It's like the ocean just starts rising rather than a wave that looks like something a surfer would ride.
Oh, it's kind of like in the movies.
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