PSN-L Email List Message

Subject: questions on strong motion and pepp systems
From: Doug doug@.............
Date: Sat, 21 Aug 1999 11:51:28 -0700


greetings qfolks,

I am setting up a seismic station here in the santa cruz mountains
of northern CA. I am very close (~1 mile) from the san andreas 
fault line and also very close to the bedrock. I will be starting
out with the 1hz and 4.5z geophones from the group buy. Because I
am close to an active fault, I would like to add some strong motion 
sensors. I wonder if anyone has recommendations on sources for 
these. I don't want to spend thousands on these but I am willing 
to spend $500-$1000. Does anyone know what I can get in this price 
range, or where I can get them? 

I am also wondering if any of you folks use your seismic data to 
trigger emergency shut off of gas, electricity, etc. Given my 
location it is inevitable that the ground will shake violently 
at some point in the future, and I'd like to set up something 
that would shut off my main propane valve, electricity to 
selected devices, etc. If anyone is aware of commercial sensors
designed to trigger this, or if you have any ideas on this 
subject, I would appreciate the help. I also have a 75 gallon
marine reef aquarium here, and I keep having these visions of
water pouring out all over the place. I am wondering if there
is something I could do to help make the aqauarium resilient 
to shaking, as in making a custom stand that would shield the
aquarium from the vibrations underneath. Any ideas?

One other question, the PEPP broadband system for $1500 looks
quite interesting. I am wondering if anyone out there is using 
this system, and if so I'd like to hear some opinions about 
your experience with it. I am wondering if I would be better 
off going with strong motion sensors next, or instead adding 
the PEPP system to my station. If you were here literally on 
the edge of the san andreas fault line on the bedrock, which 
would you choose to do?

TIA,
Doug


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Larry Cochrane <cochrane@..............>