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Message ID: 872     Entry time: Tue Jul 27 14:46:42 2010
Author: Jenna 
Type: Laser 
Category: GYRO 
Subject: Seismometer Measurements 

We have the Gurlap seismometer working, and it took data overnight (mostly) successfully. The North-South channel was not turned on, but as of this morning all three channels (North-South, East-West, and Vertical) are up and running. I've attached a plot of some data for the E-W and Vert channels comparing the noise at 3am and 11am. We calibrated the data by first converting from counts to m/s by multiplying by 40V/2^16*(1/802V/(m/s)). The 802V/(m/s) calibration comes from the Guralp spec sheet (which I've attached as a pdf). The calibration for all three channels is different, but the difference is less than 1%, so I've just chosen the calibration value for East-West and used it for all channels.

The channel names are




After we have 24 hours of data, we'll make plots for more times on all three channels.

Attachment 1: seismic727.pdf  57 kB  | Hide | Hide all
Attachment 2: Guralp_spec_sheet  0 Bytes  Uploaded Tue Jul 27 15:47:30 2010
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