[SAC-HELP] Who has the zero-polar file for Guralp CMG-3ESPC?

[Sheila Peacock]

The 3ESPC calibration documents
that I have seen are specified in velocity so the
instructions below are probably correct.  Read the
calibration document from Guralp carefully: some
Guralp seismometers have poles and zeros specified in
acceleration, so you have to add TWO zeros to integrate
to displacement for SAC.  Check that your
calibration document says "velocity response output"
above the list of poles.

Sheila P.

Onur Tan wrote:
> Dear Lee,
> 
> I attached a 3ESPC calibration document from Guralp. Generaly they have the same Pole-Zero values. I recommend that you should send a mail to
> caldoc at guralp.com.  write the sensor and digitizer serial numbers (i.e. T3W49, A203, T3W50, B201) in to the subject part. The system sends back the doc files. If you can not  get files write to support team at Guralp. They will send you manually.
> 
> The main point is that you must convert the poles-zeros in the document in to radian (poles*2*pi*f) for SAC, and add 1 extra zero for integration. and convert  A0 value to radian and displacement (see the pdf file) type.
> 
> best regards
> onur
> 
> Dr. Onur TAN
> ----------------------------------------------   40.7866N 29.4500E ---------
>  TÜBİTAK Marmara Araştırma Merkezi,  Yer ve Deniz Bilimleri Enstitüsü
>  TUBITAK Marmara Research Center, Earth and Marine Sciences Institute
>  Gebze - Kocaeli - TURKEY
> 
> 
> 
> On 15.04.2010 13:34, "Lee" <pku132 at 163.com> wrote:
> 
> Hi, all,
> 
> does anyone know the zero-polar points for Guralp CMG-3ESPC?
> 
> Thx.
> 
> Lee
> 2010-04-15
> 
> 
> 
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