A Space & astronomy forum. SpaceBanter.com

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics » Amateur Astronomy
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Tsunami Disturbs Earth's Rotation



 
 
Thread Tools Display Modes
  #1  
Old December 27th 04, 01:13 AM
SaberScorpX
external usenet poster
 
Posts: n/a
Default Tsunami Disturbs Earth's Rotation

Massive Quake, Tsunamis Kill Thousands in South Asia
More Than 11,000 Dead in Seven Countries as Tidal Waves Slam Coasts

http://aolsvc.news.aol.com/news/article.adp?id=20041225210109990003

....authorities sorted out a far-flung disaster caused by the 9.0-magnitude
earthquake, strongest in 40 years and fourth-largest in a century.

''All the planet is vibrating'' from the quake, said Enzo Boschi, the head of
Italy's National Geophysics Institute. Speaking on SKY TG24 TV, Boschi said the
quake even disturbed the Earth's rotation.

[post not intended to minimize the tragic loss of life]




  #2  
Old December 27th 04, 03:26 AM
SaberScorpX
external usenet poster
 
Posts: n/a
Default

''All the planet is vibrating'' from the quake, said Enzo Boschi, the head
of
Italy's National Geophysics Institute. Speaking on SKY TG24 TV, Boschi said

the
quake even disturbed the Earth's rotation.


In what way was it disturbed?


He doesn't elaborate.
The disaster should make mainstream headlines soon.
  #3  
Old December 27th 04, 05:21 AM
SaberScorpX
external usenet poster
 
Posts: n/a
Default

''All the planet is vibrating'' from the quake, said Enzo Boschi, the head
of
Italy's National Geophysics Institute. Speaking on SKY TG24 TV, Boschi

said
the
quake even disturbed the Earth's rotation.


Apologies for the original topic. The quake is what he claims disturbed our
rotation, not the tsunami.
Interesting that it happened near Full Moon.
Here's a site discussing our sun and moon's gravitational pull's
potential for triggering earthquakes:
http://www.freewebz.com/eq-forecasting/128.html


  #4  
Old December 27th 04, 05:47 AM
Chris L Peterson
external usenet poster
 
Posts: n/a
Default

On 27 Dec 2004 04:21:10 GMT, (SaberScorpX) wrote:

Apologies for the original topic. The quake is what he claims disturbed our
rotation, not the tsunami.
Interesting that it happened near Full Moon.
Here's a site discussing our sun and moon's gravitational pull's
potential for triggering earthquakes:
http://www.freewebz.com/eq-forecasting/128.html

Wow, that's some seriously pseudoscientific nonsense. Analysis of large numbers
of earthquakes has clearly shown that tidal strain is not a factor in triggering
earthquakes. The actual _tide_ is, however. That is, for faults beneath the
ocean or on coastlines, the crustal loading from large tides (2m) appears to be
a component in triggering earthquakes. That kind of makes sense when you
consider that the load created by a large mass of water may be asymmetric on a
fault, whereas direct gravitational loading is going to look virtually identical
on both sides of a fault.

Earthquakes, tsunamis, tides, and winds all disturb the Earth's rotation. Their
effects are largely unpredictable, and time references are adjusted following
actual measurement of the Earth's rotation period.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
  #5  
Old December 27th 04, 06:45 AM
Davoud
external usenet poster
 
Posts: n/a
Default

Chris L Peterson:
Earthquakes, tsunamis, tides, and winds all disturb the Earth's rotation.
Their effects are largely unpredictable, and time references are adjusted following
actual measurement of the Earth's rotation period.


Indeed. I recall reading that the opeation of the massive Rance Estuary
tidal generating station in France slows the rotation of the Earth by a
very tiny, but measurable amount.

Davoud

--
usenet *at* davidillig dawt com
  #6  
Old December 27th 04, 01:47 PM
md
external usenet poster
 
Posts: n/a
Default


"SaberScorpX" wrote in message
...
Massive Quake, Tsunamis Kill Thousands in South Asia
More Than 11,000 Dead in Seven Countries as Tidal Waves Slam Coasts

http://aolsvc.news.aol.com/news/article.adp?id=20041225210109990003

...authorities sorted out a far-flung disaster caused by the 9.0-magnitude
earthquake, strongest in 40 years and fourth-largest in a century.

''All the planet is vibrating'' from the quake, said Enzo Boschi, the head of
Italy's National Geophysics Institute. Speaking on SKY TG24 TV, Boschi said the
quake even disturbed the Earth's rotation.


So that's why my GOTO mount was slightly off last night!
--
md
10" LX200GPS-SMT
ETX105
www.xs4all.nl/~martlian


  #7  
Old December 27th 04, 06:16 PM
SaberScorpX
external usenet poster
 
Posts: n/a
Default

...the load created by a large mass of water may be asymmetric on a
fault, whereas direct gravitational loading is going to look virtually
identical
on both sides of a fault.


The direct gravitational load on 'both' sides of a fault would seem
to easily vary with Earth's rotation.
The stress would not only be E-W / N-S, but an overall pushing and pulling at
depth layers as well.
I know there are two schools, gravitational effects vs. tidal influence.
Looks like they are both contributors, to whatever degree.
In any case, it's another major earthquake occurring
near apogee/perigee.







  #8  
Old December 27th 04, 07:31 PM
Chris L Peterson
external usenet poster
 
Posts: n/a
Default

On 27 Dec 2004 17:16:12 GMT, (SaberScorpX) wrote:

The direct gravitational load on 'both' sides of a fault would seem
to easily vary with Earth's rotation.
The stress would not only be E-W / N-S, but an overall pushing and pulling at
depth layers as well.


Faults are small structures. There is no way that gravitational or tidal forces
can produce significant differential forces across them, and differential forces
are what you need to increase the strain and possibly trigger an earthquake.
This is born out by statistical analyses of thousands of earthquakes, which have
shown no correlation between tides or solar and lunar position and the time of
earthquake occurrence for inland faults located more than a few miles from the
coast. There is a strong correlation between tide and time of occurrence for
earthquakes occurring on undersea faults, however, presumably because of the
direct tidal effect of water mass.

I know there are two schools, gravitational effects vs. tidal influence.


I'm not aware of any serious researchers who consider gravitational or direct
tidal influence to have any bearing on when earthquakes occur. Gravitational
forces are an important part of plate tectonic models, but earthquakes are
seldom associated directly with plate-to-plate interactions.

In any case, it's another major earthquake occurring
near apogee/perigee.


Yes, in this case it was an undersea fault that broke, so it may fit nicely with
the correlation to tides.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
  #9  
Old December 27th 04, 07:50 PM
james
external usenet poster
 
Posts: n/a
Default

On 27 Dec 2004 05:10:29 GMT, Uncle Bob
wrote:

Chris L Peterson wrote:
On 27 Dec 2004 04:21:10 GMT, (SaberScorpX) wrote:


Earthquakes, tsunamis, tides, and winds all disturb the Earth's rotation. Their
effects are largely unpredictable, and time references are adjusted following
actual measurement of the Earth's rotation period.



Well, we'd better get on it, then. I may have to adjust the RA trimmer
pot on my CG5 mount.

Uncle Bob

_________________________________________________ ______________________________
Posted Via Uncensored-News.Com - Accounts Starting At $6.95 -
http://www.uncensored-news.com
The Worlds Uncensored News Source

**************

The NBS has been adding a leap second every Dec 31 for the past ten to
fifteen yrs that I can remember. It already is well known that the
Earth's rotation is slowing down by about one second each year.

At best this quake may h ave slowed down the Earth's rotation be a few
milliseconds to a second at most. We shouls know withing a few months
to the exact amount if there was any.

james

  #10  
Old December 27th 04, 08:49 PM
Stephen Tonkin
external usenet poster
 
Posts: n/a
Default

SaberScorpX wrote:
I know there are two schools, gravitational effects vs. tidal
influence. Looks like they are both contributors, to whatever degree


Statistical analysis shows that there is no significant difference
between lunar syzygy and lunar quadrature with respect to earthquake
occurrence. Or, if you prefer, it shows that all earthquakes occur
within about 7.5 days of lunar syzygy.


Best,
Stephen

Remove footfrommouth to reply

--
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ Stephen Tonkin | ATM Resources; Astro-Tutorials; Astro Books +
+ (N51.162 E0.995) | http://astunit.com +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Scientists Find That Saturn's Rotation Period Is A Puzzle Ron Astronomy Misc 2 June 30th 04 10:41 AM
Radioactive Potassium May Be Major Heat Source in Earth's Core Ron Baalke Astronomy Misc 20 December 21st 03 11:15 AM
Radioactive Potassium May Be Major Heat Source in Earth's Core Ron Baalke Science 0 December 15th 03 06:42 PM
Incontrovertible Evidence Cash Astronomy Misc 1 August 24th 03 07:22 PM
Incontrovertible Evidence Cash Amateur Astronomy 6 August 24th 03 07:22 PM


All times are GMT +1. The time now is 11:45 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.