Meteorite

Just out of interest, how big a meteorite would be
needed to cause a equivalent tsunami to the one in
south east Asia ? Not an easy question I guess.

H.

Probably depends on speed at impact since E=0.5mv^2.

We need to know the energy that the quake dumped into the ocean
as the tsunami.


Martin
--
M.A.Poyser Tel.: 07967 110890
Manchester, U.K. http://www.fleetie.demon.co.uk

In message , Fleetie
writes
Probably depends on speed at impact since E=0.5mv^2.

We need to know the energy that the quake dumped into the ocean
as the tsunami.


Martin

Howard asked how big a meteorite would be needed to create a tsunami
like the one in Asia (hint: quoting is useful)
I don't know how much energy goes into the wave, but the total energy of
a Richter 9 earthquake is about 10^25 ergs, which is the same as the
kinetic energy of a 250 meter rock moving at 50 km/s. Again, I don't
know how much energy would go into the wave if it hit in deep water.
As you'd expect, there's a lot about this on the Web, and
http://www1.tpgi.com.au/users/tps-seti/spacegd7.html#tsunamiimpact
looks interesting.
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"Jonathan Silverlight"
Howard asked how big a meteorite would be needed to create a tsunami like the one in Asia (hint: quoting is useful)

The question "How big ... ?" is invalid as it stands.

You need to specify at least density and closing speed, as well as
whether the size referred to that before encountering the atmosphere
and having possibly large amounts of the meterorite burnt off, or
whether it was the size at impact having travelled through the
atmosphere, and probably other variables too.


Martin
--
M.A.Poyser Tel.: 07967 110890
Manchester, U.K. http://www.fleetie.demon.co.uk

On Sun, 2 Jan 2005 17:19:56 -0000, "howard" wrote:

| Just out of interest, how big a meteorite would be
| needed to cause a equivalent tsunami to the one in
| south east Asia ? Not an easy question I guess.
|

Not a simple comparison as you say.
The Asian tsunami was caused by a relatively slow (several seconds)
slumping of the ocean floor.
A large meteorite hits at one hell of a speed.
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Dave Fawthrop
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In message , Dave Fawthrop
writes
On Sun, 2 Jan 2005 17:19:56 -0000, "howard" wrote:

| Just out of interest, how big a meteorite would be
| needed to cause a equivalent tsunami to the one in
| south east Asia ? Not an easy question I guess.
|

Not a simple comparison as you say.
The Asian tsunami was caused by a relatively slow (several seconds)
slumping of the ocean floor.
A large meteorite hits at one hell of a speed.

Http://www.lpl.arizona.edu/impacteffects/

There's a Javascript program here for the enthusiasts.


Have fun

Brian
--
Brian Howie