Moon's altered orbit

I asked this question at sci.space.tech, likely the wrong place.

If something physical or meta-physical happened whereby the Moon's
orbit was suddenly changed to an apogy of just within Earth's
gravitational pull (sorry, don't know the distance) and a perogy of
150,000 to 175,000 miles:

What are the affects on Earth. Tides I know about. What about
tectonic affects? Are there any documents or sites detailing severe
changes to the Moon's orbit.

Thanks
Ian

On Tue, 27 Jan 2004, Ian wrote:

I asked this question at sci.space.tech, likely the wrong place.

If something physical or meta-physical happened whereby the Moon's
orbit was suddenly changed to an apogy of just within Earth's
gravitational pull (sorry, don't know the distance) and a perogy of
150,000 to 175,000 miles:

The moon is already within Earth's gravitational pull otherwise
it wouldn't be orbiting Earth.

What are the affects on Earth. Tides I know about. What about
tectonic affects? Are there any documents or sites detailing severe
changes to the Moon's orbit.

As tidal effects of the moon also have effect upon land, were the moon
closer, those effects would be more noticeable perhaps in increased
volcanos, earthquakes. Upon land the tidal effects can cause heating of
rock due to the bulging and relapse of rock structures.

Ian wrote:

If something physical or meta-physical happened whereby the Moon's
orbit was suddenly changed to an apogy of just within Earth's
gravitational pull (sorry, don't know the distance) and a perogy of
150,000 to 175,000 miles:

The Moon is in earths gravity pull. Earths gravity pull extends to infinity
as all gravitional fields. The Moon is also lying relativly deep in the
gravity pull. If it were not, or it's velocity was higher, it would leave
earth and enter a (possible) solar orbit like the planets.

If the Moon was in a lower orbit (say circular) the tides would have been
stronger, and the tides would have been more often (the orbital time would
have been shorter).

The moon is actualy moving away from earth now. It moves a few cm every
year.

Thanks
Ian

Sincerely
Bjørn Ove

Ian wrote:

I asked this question at sci.space.tech, likely the wrong place.

Try rec.arts.sf.science. Unmoderated, but very helpful.

If something physical or meta-physical happened whereby the Moon's
orbit was suddenly changed to an apogy of just within Earth's
gravitational pull (sorry, don't know the distance) and a perogy of
150,000 to 175,000 miles

An Earth orbit is stable out to around 78 Earth-radii, (497,000 km,
or about 1.3 times it's current distance). So you are assuming a
perigee of 150,000 km (24 Earth-radii) and an apogee of around 490,000
km (77 Earth-radii). That's a semi-major axis of 320,000 km, only a
little closer than currently, with a period of about 21 days.

What are the affects on Earth. Tides I know about.

Do you know how high they would be, at perigee & apogee? You can do
some basic scaling to figure it out (I get tides roughly 17 times as
high, baseline), but resonbance in the ocean basins is going to cause
some real problems.

What about tectonic affects?

Can you tell me why there might be? I don't want to do the homework
here...

--
Brian Davis