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Live loads for seismic design

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Why is live load completely ignored in seismic calculations, (except for
storage loads and tanks, at least here in Canada) ?  Is it because the
live load slides around and therefore imparts little inertial load on
the structure ?  

How about a parking structure ?  Should the parked cars be considered as
non storage and ignored ?  I can't imagine they would slide around much
during an earthquake, except maybe in a good California shake.  I would
think that the live load should be considered for seismic design in a
parking structure. 

How do others treat this ?

Kevin Below

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