Slowly but surely, the truth on the nuclear tsunami seeps across the blogosphere... you'll be the only party-pooper left, Searle!
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1. A one megaton bomb can measure 7.5 on the Richter scale. Note the use of "can measure". It really matters where the bomb is placed. If, for example, you drop a bomb on a fault line, or use a "bunker buster" that digs into the ground, you might wind up with a bit more or less force.
From: archaeology.org
Thus 10 megatons could measure 8.5 on the Richter scale, and 30 megatons would be necessary to cause a 9.0. It could have been easily caused by a few cold-war nukes.
2. The Richter scale (ML) wasn't exactly used to measure this quake, since the frequency was so low and the compression statistics were correspondingly crappier.
neic.usgs.gov
The monitoring in this region wasn't exactly stellar. It's a big source of debate right now in India (who's gonna pay for better monitoring).
3. My request to purchase satellite picutres of the earthquake from digitalglobe.com got this response:
"We do not have imagery over the ocean where the tsunami originated.
However, we do have imagery over the Asian regions affected by the
tsunami with numerous resources available on our website for obtaining
or observing this imagery listed below."
4. "The Indian Ocean ... had not had a tsunami in recorded history"
the.honoluluadvertiser.com
5. Can a nuclear explosion cause an earthquake?
"On January 19, 1968, a thermonuclear test, codenamed Faultless, took place in the Central Nevada Supplemental Test Area. The codename turned out to be a poor choice of words because a fresh fault rupture some 1200 meters long was produced"
earthquake.usgs.gov
6. Estimations of focal depth of the Northern Sumatra quake is reported at 30 KM
neic.usgs.gov
However, you have to read the fine print.
neic.usgs.gov
If the depth of an event is not satisfactorily determined by the data, it is held to a default depth, and the Location Quality shows "depth fixed by location program."
If you look at the phase data, you see only a handful of broadly varying estimates of focal depth, averaging 15KM. That's why the data was not used for the location estimate. Instead, a geologist estimated the depth at 30KM based on fault data because, logically, an earthquake cannot originate from the ocean floor.
Note: The ocean depth at that point is 1.3KM += .5 KM
topex.ucsd.edu
Deep sea submersibles routinely explore at that depth, so water pressure preventing a proper explosion would not be an issue.
documentroot.com
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