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Z factor definition
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- Subject: Z factor definition
- From: Bob Hanson <Hansonb(--nospam--at)hilberteng.com>
- Date: Tue, 26 Oct 1999 08:47:14 -0700
List, I would like clarity in defining terms related to Z in the UBC seismic formula. As I understand it the Z is the estimated peak horizontal ground acceleration (.4g for zone 4) on rock with a 10% probability of being exceeded in 50 years. I am looking at a site 1.5 km from a type B fault in the LA basin on natural alluviam.In the soil report the statement using identical terms states the acceleration as .55g. The soil report basis is the National Seismic Hazard Mapping Project by the USGS. I recognize that site specific soils play into this and my question is should I use a Z value of .55? Are the C, N & S factors for near source going to ratchet the .55 beyond intent? Thanks in advance, Bob Hanson
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