Table T16. Sensor sensitivity of Guralp seismometer.
 
Component
Stream identifier
Sensitivity
Unit
OBH T1023:


Velocity channels (24-bit resolution):


Vertical D003Z6 2.015424E+09 Counts/m/s
North-south D003N6 2.070694E+09 Counts/m/s
East-west D003E6 2.044987E+09 Counts/m/s
Acceleration channels (16-bit resolution):


Vertical D003M8 1.198741E+07 Counts/m/s2
North-south D003M9 1.229458E+07 Counts/m/s2
East-west D003MA 1.250960E+07 Counts/m/s2
Temperature: D003ME 77.700078 Counts/K
OBH T1038:


Velocity channels (24-bit resolution):


Vertical D417Z6 2.032134E+09 Counts/m/s
North-south D417N6 2.052699E+09 Counts/m/s
East-west D417E6 2.038560E+09 Counts/m/s
Acceleration channels (16-bit resolution):


Vertical D417M8 1.219381E+07 Counts/m/s2
North-south D417M9 1.297704E+07 Counts/m/s2
East-west D417MA 1.290025E+07 Counts/m/s2
Temperature: D417ME 77.700078 Counts/K

Note: velocity (V) for a digital sample (x) is given as (in terms of Laplace variable [s])

V(s) = [G x A x H(s)] x,

where

G = velocity output sensitivity as listed above.
A = normalizing factor to make the magnitude of A x H(s) unity. For the Leg 195 OBHs, A = -45.63 at 1Hz.
H(s) = the transfer function in factored form.

zn are the roots of the numerator polynomial, giving the zeroes of the transfer function, and pn are the roots of the denominator polynomial giving the poles of the transfer function. The poles and zeroes for the CMG1Ts for all the velocity channels are as follows:

 
Poles
(Hz)
Zeroes
(Hz)
-1.964E-03 ± 1.964E-03 j 0
-80 ± 30 j 0

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