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Originally posted by darkstar57
revise my last comment, re virginia quake felt on 7th floor in baltimore.
i interviewed two co workers who were on the ground in baltimore, they said that quake was about 30 seconds, and that it began with with a fore shock... causing visible fluids to slosh, then visible waves in an asphalt parking lot, then back to sloshing. i saw the duration of the quake...from the 7th floor as less than 12 seconds.
i think that i did not feel the fore shock rumblings because the 7 stories were damping them...
SO i my support for an underground nuke is withdrawn. back to the conventional quake view.
the only real bit of information here is that a building can dampen the impact of minor earthquake shock waves.