I got the coordinates of both the Columbia quake and the YSB station sensor, and used a distance between coordinates calculator.
It's 5,387.12 km distance between the two points
divided by
8 km/s= 673.39 seconds
673.39 seconds (divide by 60) =
11.2 minutes rough estimated time (at 8 km/s average wave speed)
YSB shows the event arriving at 20:12 UTC
The event in Columbia occurred at about 19:48 UTC
The difference is about 24 minutes- more than twice the time it should have taken to arrive using an 8 km/s estimated P-wave travel speed. It would take using an average of 4 km/s wave speed to equal a 22.4 minute travel time. And even slower, like 3.8 km/sec to get to the actual observed arrival time of 24 minutes.
The other problem is that this quake registered strongest in mid Montana on Gee, and strongest at YSB station. And LWKY barely even registered it. And stations south of the Lake barely registered it. Given the location of those sensors, it would imply that the quake came from mid Montana or east or maybe north of the Lake Yellowstone somewhere.
Very strange, but possible I suppose if the average wave travel speed was in the 3 to 4 km/s range. But I just don't understand given all I saw on that one how it could have come from the south relative to YS.
Plus, are we going to register a mere 4.7 mag quake at 5,387.12 km away with a signature on all three channels showing dead even pretty much? Not likely, and that would not match other s-wave signatures from far away quakes I've seen. And there's one good reason right there to monitor all three channels and NOT discard any.
[edit on Tue Jan 13th 2009 by TrueAmerican]



.
'). As long as we can all
watch and speculate then it is good _javascript:icon('