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Ca factor in the 1997 UBC

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In the 1997 UBC the Ca factor for soil type Se is .36Na which is less then
for soil types Sb, Sc,& Sd.  What is the reason for this?

I know that short period structures are acceleration controlled and that
long period structures are velocity controlled but what does that have to do
with the soil coefficients?

It would appear that soft soil types are less prone to acceleration,
therefore there is a reduced value for Ca.  Is this the reason for the
reduced value?

Mark Harper  SE
HDR INC.
mharper(--nospam--at)hdrinc.com
Phone: (626) 564-2820
Fax: (626) 564-2873