02-28-2010, 07:59 AM
Greetings All,
Hey, speaking of the geoid being perturbed ...
Out of the raw data from this buoy ...
![[Image: 32412_mini.jpg]](http://www.ndbc.noaa.gov/images/stations/32412_mini.jpg)
![[Image: noaaleft.jpg]](http://www.ndbc.noaa.gov/images/nws/noaaleft.jpg)
... located at 13s 86w some 630 miles southwest of Peru along a direct line from Santiago, Chile, to the Hawaiian archipelago, I teased out this little graph ...
![[Image: 13s86w.png]](http://home.comcast.net/~TomsWeekender/byyb/13s86w.png)
... which shows three complete oscillations of the sub-lunar/antipodal axis (otherwise known as the tides) shown in green, and the passage of the Tsunami wave at about 7:00am zulu, followed a few hours later by a bunch of waves reflected from various continents. Â
This particular buoy is located in the doldrums (Intertropical Convergence Zone) which is dominated by a persistent low pressure system centered on the Equator and therefore experiences very calm conditions with little wind or waves. Â The scale on the left shows the height of the water column over the ocean floor in feet, so the Tsunami wave measures about two feet from trough to crest. Â The wave was traveling at +500 mph and took 3 minutes to get past the buoy, so it measured about 25 miles wide. Â That's a lot of water.
Even so, if you were sitting in your Weekender floating next to the buoy, you would not have even noticed the passage of the wave.
Cheers,
Tom
http://www.ndbc.noaa.gov/
Polar graph of same ...
![[Image: Tsunami2.png]](http://home.comcast.net/~TomsWeekender/byyb/Tsunami2.png)
Midnight is at the top, Noon on the bottom, and the origin is local low tide.
Hey, speaking of the geoid being perturbed ...
Out of the raw data from this buoy ...
... located at 13s 86w some 630 miles southwest of Peru along a direct line from Santiago, Chile, to the Hawaiian archipelago, I teased out this little graph ...
... which shows three complete oscillations of the sub-lunar/antipodal axis (otherwise known as the tides) shown in green, and the passage of the Tsunami wave at about 7:00am zulu, followed a few hours later by a bunch of waves reflected from various continents. Â
This particular buoy is located in the doldrums (Intertropical Convergence Zone) which is dominated by a persistent low pressure system centered on the Equator and therefore experiences very calm conditions with little wind or waves. Â The scale on the left shows the height of the water column over the ocean floor in feet, so the Tsunami wave measures about two feet from trough to crest. Â The wave was traveling at +500 mph and took 3 minutes to get past the buoy, so it measured about 25 miles wide. Â That's a lot of water.
Even so, if you were sitting in your Weekender floating next to the buoy, you would not have even noticed the passage of the wave.
Cheers,
Tom
http://www.ndbc.noaa.gov/
Polar graph of same ...
Midnight is at the top, Noon on the bottom, and the origin is local low tide.