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RE: Alquist Priolo Occupancy

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Has anyone ever tracked fault traces produced by subsequent earthquakes on a given section of a given fault?  Will the future trace follow the past trace?  I doubt it.  In alluvium, if the shaking that produced the trace resulted in consolidation or compaction of the soil adjacent to the trace, it seems most probable that the next trace, if it occurs, will follow a different course through the alluvium; but who know?  It’s a shell game that I wouldn’t play.


Nels Roselund, SE

South San Gabriel, CA


From: Jnapd(--nospam--at) [mailto:Jnapd(--nospam--at)]
Sent: Wednesday, June 22, 2005 5:28 PM
To: seaint(--nospam--at)
Subject: Re: Alquist Priolo Occupancy



In our area the county Geologist determines the set back from a known fault trace.

The Architect has no input or knowledge for that matter. Usually it is 50 feet to any building structure except site work and minor walls. Retaining walls crossing the fault trace, you are asking for a lawsuit.


As an engineer you would not build a structure across a know fault trace. We have an understanding of the probable damage that will occur and the structure will become non useable to the client.


Sometime we have to protect our clients from their own stupidity....


Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA