Thread: Re: Response file confusion

Started: 2012-03-14 21:04:45
Last activity: 2012-03-14 21:04:45
Topics: SAC Help
rt wang
2012-03-14 21:04:45
Hi,

Sorry, oops! I had posted the wrong time span. The response file from
IRIS has the same poles and zeros throughout. Allow me the repost:

=======
#
###################################################################################
#
B050F03 Station: RDM
B050F16 Network: AZ
B052F03 Location: ??
B052F04 Channel: BHE
B052F22 Start date: 2004,056,18:43:30
B052F23 End date: 2011,204,18:14:59
#
# +-----------------------------------+
# | Response (Poles and Zeros) |
# | AZ RDM BHE |
# | 02/25/2004 to 07/23/2011 |
# +-----------------------------------+
#
B053F03 Transfer function type: A
B053F04 Stage sequence number: 1
B053F05 Response in units lookup: M/S - velocity in meters
per second
B053F06 Response out units lookup: V - emf in volts
B053F07 A0 normalization factor: +5.74357E+12
B053F08 Normalization frequency: +2.00000E-01
B053F09 Number of zeroes: 5
B053F14 Number of poles: 9
# Complex zeroes:
# i real imag real_error imag_error
B053F10-13 0 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00
B053F10-13 1 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00
B053F10-13 2 -1.51500E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00
B053F10-13 3 -3.18600E+02 +4.01200E+02 +0.00000E+00 +0.00000E+00
B053F10-13 4 -3.18600E+02 -4.01200E+02 +0.00000E+00 +0.00000E+00
# Complex poles:
# i real imag real_error imag_error
...


From all helps and also to my understanding that the instrument may change
over different times, therefore the poles and zeros should be different
from time to time.
But at least from my requested file, it is pretty much the same through out
2000-2011.

--Tien


On Wed, Mar 14, 2012 at 12:35 PM, Milton Plasencia <mplasencia<at>inogs.it>wrote:


Hi Tien,

at first glance, if you see the start time of the response files are
different, so
i think that are different instruments.
cheers,

Milton


On Mar 14, 2012, at 7:57 PM, Tien-Huei Wang wrote:

Hi all,
I 've been using broadband data from IRIS on research and recently
encounter a confusing thing about response.
I am using the BH* channels of network AZ, and it should be velocity
data. I downloaded sac files from SCEC stp.
I originally request response file in SEED format, then extracted it to
be RESP.AZ.XXX..BHX, the response file.
Recently, because I want to confirm the amplitudes in velocity and also
in displacement is correct, I went to IRIS SeismiQuery to get the response
file updated until 2011. Surprisingly, the extracted response file from my
SEED format and the response file from SeismiQuery are different.
The RDSEED extracted response file has 2 zeros and 5 poles, but the
response file from SeismiQuery has 5 zeros 9 poles.
I thought 2 zeros is standard for velocity response, had no idea what
the 5 zeros are. They are from the same time span for same station.

Post front portion of RESP files
1. from RDSEED:
=================================
# << IRIS SEED Reader, Release 4.7.5 >>
#
# ======== CHANNEL RESPONSE DATA ========
B050F03 Station: RDM
B050F16 Network: AZ
B052F03 Location: ??
B052F04 Channel: BHE
B052F22 Start date: 2004,056,18:43:30
B052F23 End date: No Ending Time
# =======================================
# +
+--------------------------------------------+ +
# + | Response (Poles & Zeros), RDM ch
BHE | +
# +
+--------------------------------------------+ +
#
B053F03 Transfer function type: A [Laplace Transform
(Rad/sec)]
B053F04 Stage sequence number: 1
B053F05 Response in units lookup: M/S - velocity in
meters per second
B053F06 Response out units lookup: V - emf in volts
B053F07 A0 normalization factor: 5.91892E+07
B053F08 Normalization frequency: 0.159155
B053F09 Number of zeroes: 2
B053F14 Number of poles: 5
# Complex zeroes:
# i real imag real_error imag_error
B053F10-13 0 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00
B053F10-13 1 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00
# Complex poles:
# i real imag real_error imag_error
B053F15-18 0 -3.701000E-02 3.701000E-02 0.000000E+00 0.000000E+00
B053F15-18 1 -3.701000E-02 -3.701000E-02 0.000000E+00 0.000000E+00
B053F15-18 2 -2.513000E+02 0.000000E+00 0.000000E+00 0.000000E+00
B053F15-18 3 -1.310000E+02 4.673000E+02 0.000000E+00 0.000000E+00
B053F15-18 4 -1.310000E+02 -4.673000E+02 0.000000E+00 0.000000E+00


2. from SeismiQuery
======================================


###################################################################################
#
B050F03 Station: RDM
B050F16 Network: AZ
B052F03 Location: ??
B052F04 Channel: BHE
B052F22 Start date: 2000,264,20:11:00
B052F23 End date: 2001,250,20:49:00
#
# +-----------------------------------+
# | Response (Poles and Zeros) |
# | AZ RDM BHE |
# | 09/20/2000 to 09/07/2001 |
# +-----------------------------------+
#
B053F03 Transfer function type: A
B053F04 Stage sequence number: 1
B053F05 Response in units lookup: M/S - velocity in
meters per second
B053F06 Response out units lookup: V - emf in volts
B053F07 A0 normalization factor: +5.74357E+12
B053F08 Normalization frequency: +2.00000E-01
B053F09 Number of zeroes: 5
B053F14 Number of poles: 9
# Complex zeroes:
# i real imag real_error imag_error
B053F10-13 0 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00
B053F10-13 1 +0.00000E+00 +0.00000E+00 +0.00000E+00 +0.00000E+00
B053F10-13 2 -1.51500E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00
B053F10-13 3 -3.18600E+02 +4.01200E+02 +0.00000E+00 +0.00000E+00
B053F10-13 4 -3.18600E+02 -4.01200E+02 +0.00000E+00 +0.00000E+00
# Complex poles:
# i real imag real_error imag_error
B053F15-18 0 -3.70000E-02 +3.70000E-02 +0.00000E+00 +0.00000E+00
B053F15-18 1 -3.70000E-02 -3.70000E-02 +0.00000E+00 +0.00000E+00
B053F15-18 2 -1.59900E+01 +0.00000E+00 +0.00000E+00 +0.00000E+00
...


Does anyone know why and how this will affect our final outcome? What
are the outputs and will they be consistent?

Thanks,

--Tien
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