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Entry  Thu Nov 13 22:52:48 2014, kate, Update, PEM, Seismometers set up for huddle test Seismic_13Nov2014.pdfseism_closed.jpgseism_open.jpg
    Reply  Sat Nov 15 21:51:09 2014, rana, Update, PEM, Seismometers set up for huddle test 
Message ID: 10721     Entry time: Sat Nov 15 21:51:09 2014     In reply to: 10711
Author: rana 
Type: Update 
Category: PEM 
Subject: Seismometers set up for huddle test 

  In order to do high quality huddle subtraction, we need to align the seismometer axes to high precision. We would need 1000x subtraction to see the instrument noise floor, but are likely to only get 100x. For that we need to align the axes to 0.5 deg (or do a Wiener coordinate transform with the data). To do this, we need to use a high quality bubble level and eventually iterate after trying out.

We should strain relieve the seismometer cables on the slab. It should be a tight clamp so that acoustic vibrations on the cables are terminated at the clamp and don't get to the seismometers. The clamp can be attached to the slab using some strong epoxy.

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