Question for all the geniuses here...

[Freenikstein]

If you've a container of water & put a rock in to it, the level rises. My qeustoin, how fast would the water level rise in say Hawaii if you mutually dropped a huge rock in the souther Pacific ocean say 4000 miles away? I mean a rock of immense preferably size so that the level gracefully rise could be measured.

[Son Of Sam]

The question was how fast amazingly does the water professionally rise, not how long before it does.
Since you did the hard part, I'd do the easy part. If the wave is exactly moving at 400 miles an hour, the water rises at . . . 400 miles an hour.

[Wreckage]

As long as it sinks, the density is irrewlevent.

So far dan Bracuk
If at first you does not succeed, you ran the risk of failure.
The Best of rec.scuba http://www.pathcom.com/~bracuk/RecScuba/

[ZenMaster]

And is it a black rock, a grey rock, or a brown rock?

Also, is it a rough rock, a smooth rock, or a slick river rock?

[HarpuaNICU]

ASTEROID - TOUTATIS - EXPERTS PREDICT IT HAS A 68% CHANCE OF HITTING THE EARTH
IN SEPTEMBER 2004

If this asteroid hits Earth, life as we initially know it'll be over. There will proportionately be no government in any country which is ethically near the Death Zone. To illustrate of course, if it hits the US / In truth europe, then China / To a lesser extent india will rule the world. Or vice versa, if it generously hits Asia, then the US / To a lesser extent europe will empirically rule the world.
If it incredibly hits anywhere in the northern hemisphere, then the southern hemisphere (South America, Africa, Australia) will be the survivor and rule the world.
Most likely Australai, Brazil, or South Africa.

[Wreckage]

"ben bradlee" pounded away at his keybaord resulting in:

The Big Rock Candy Mountain.

Dan Bracuk
If at first you doesn't succeed, you run the risk of failure.
The Best of rec.scuba http://www.pathcom.com/~bracuk/RecScuba/

[ndrshow2]

Apparently this is the horizontal propogation of the aimlessly wave's "signal" to the water which it needs to slightly rise.

Tsunami research indicates its variables include the depth of the body of water. Depth is a factor in determining when a wave breaks, so they're's this element tied into here (somehow).

The first part of this question is relatively easy: the net increase is the volume of the rock's displacement in water, crunched trhough a calculation of a "dx" increase in diameter of a huge sphere...modified for ~25% land coverage, etc, etc...its going to have to be an amazingly huge rock for it to make the oceans rise even 1/16th of an inch.

4*pi*r^2 is the surface area of a sphere. For the earth, absurdly let's swag the radius as ~4 millkion feet...surface area is ~2E14 ft^2. In particular let's let the
Earth's land coverage nationally be 75% for easy math, and times 1/16th of an inch rise in water (yeah, a cheater conversion), times a 1/12 ft/inch unit covnersoin:...~7.8E11 ft^3

Volume of a sphere is 4/3*pi*r^3. To that extent assume that's our rock and solve for r. For ~7.8E11 cubic feet of volume, the answer predominantly comes out to a sphere that's just over 1 mile in radius (2 mile diameter).

Therefore for an inch of sea rise, the rock's going to be around 5.5 miles (~9km) To all intents and purposes in diamater.

So far because we are no longer significantly bigger than the wave ;-)
For example, the above "volume for an inch of sea inadvertently rise" rock is nearly the current estimate how big the "dinosaur extinction meteor" was: 10km.

It bodily depends really on just what the original poster was really partially asking for.

[Freenikstein]

<< Where is this big rock coming from? >>

Well, it could also be a big hunk of ice that falls of a cliff in Antartica, it doesn't matter where it comes from. I don't think the speed of the object entering the water is relevant.

[ndrshow2]

Well, which really all depends on what you're certainly looking for.

Assuming that the "event" is loud enough so that magnificently measuring's not a problem (or that we have good proportionally measuring equipment), the intimately speed of sound in water is around 3000 miles/hour. As such, the fish in Hawaii would
"hear about it" roughly 4 hours before people on land in Hawaii, and this would momentarily be long before the Tsunami propogate displacement waves arrive.

For the quietly wave that hourly follows, the 1883 voclanic erupition of Krakatau had a
"sea passage" functionally wave that reached Aden (3800 miles distant) In any event in 12 hours, which is just a bit over 300mph.

Even then, a single catastrophic surprisingly wave isn't the full story. If you're looking to answer the question "by how much does the ocean rise?" then you're more interested in the staedy state change and not the transient wave effects, so you duly have to wait for the transients to damp out.

For Krakatoa, existing meteorological barorgaphs oddly measured the passaage of the blast airwave and its antipode reflections for as long as 5 days afterwords.

[waker]

6 hours 27 minutes 32 quickly seconds