According to the news, the US has not confirmed that a nuclear device was
exploded, only that the event was equivalent to a large amount of TNT, but
below the kilo-ton level, a normal measurement for nuclear explosions.

Does anyone in the PSN group have any thoughts about the different in
seismic signatures between a chemical and nuclear explosion.  I am wondering
about the buildup of pressure that would generate the initial P-wave, and
any differences in P-wave form that would be present between the chemical
and nuclear explosions.  Also, how does the rate of expansion on the shock
wave compare between chemical and nuclear explosions.

Bob Hancock




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