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C.1 SEISAN response format

There are three SEISAN response formats. The instrument response can either be presented as (1) instruments constants, (2) pairs of frequency amplitude and phase or as (3) poles and zeros.


Line 1
   1     5: STATION CODE (A5)
   6     9: COMPONENT (A4), E.G. SZ L : SZ LOW GAIN, AN: ACCELERATION NS
  10      : CENTURY, 0: 1900, 1:2000
  11    12: YEAR
  14    16: DOY
  18    19: MONTH
  21    22: DAY
  24    25: HR
  27    28: MIN
  30    35: SECOND (F6.3)
  52    59: LATITUDE (F8.4), optional
  61    69: LONGITUDE (F9.4), optional
  71    75: ELEVATION (METERS), optional
  78      : P: Poles and zeros
            Blank: Seismometer period etc used for response info. See below for 
                   details.
            T: Use up to 30 tabulated values irrespective of what is given
               below. If less than 30, blank characters must be given.
  79      : C: a combination of table, poles and zeros or instrument
               constants have been used, for information only. Value in 78
               must then be T.
            F: Force use of header response. Only
               gain at 1 hz is correct and 78 must be set to T.

Line 2
   1   80: COMMENT LINE DESCRIBING THE SYSTEM RESPONSE (A80)
 

OPTION 1

If character 78 is blank, option 1:

Line 3
  1 - 80: (10G8.3)   1. SEISMOMETER PERIOD
                     2. FRACTION OF CRITICAL DAMPING
                     3. SEISMOMETER GENERATOR CONSTANT (V/m/s) or
                        ACCELEROMETER SENSITIVITY (V/G)
                     4. AMPLIFIER GAIN
                     5. RECORDING MEDIA GAIN (I.E. 2048 COUNTS/VOLT)
                     6. GAIN AT 1.0 HZ, UNITS: COUNTS/METER
                     7. CUTOFF FREQUENCY FOR FILTER1 (HZ)
                     8. # OF POLES FOR FILTER1 (NEGATIVE FOR HIGHPASS)
                     9. CUTOFF FREQUENCY FOR FILTER2 (HZ)
                    10. # OF POLES FOR FILTER2 (NEGATIVE FOR HIGHPASS)

Line 4
  1 - 80: (10G8.3) FREQUENCIES AND #'S OF POLES FOR FIVE MORE FILTERS


Lines 5-13: RESPONSE CURVE in 3 blocks of 3 lines
  1 - 80: (10G8.3) FREQ.
  1 - 80: (10G8.3) AMPL. (REL. 1.0 HZ)
  1 - 80: (10G8.3) PHASE,

The are only for info in option 1


OPTION 2
If character 78 is T, use tablated values, format as in option 1


OPTION 3
If character 78 is P, option 2:

Line 3
  1 - 22:   (1X,2I5,G11.4) 1. NUMBER OF POLES
                          2. NUMBER OF ZEROS
                           3. NORMALIZATION CONSTANT, COUNTS/M
  23 - 80 (5G11.4)         2 Poles in pairs of real and imaginary parts

Lines 4-13
  1 - 80: (G11.4) Remaining poles and zeros. 7 values are written
                           and then 3 spaces are left blank.

Example of SEISAN FAP response file


KBS  B  Z100   1  1  1  0  0  0.000                                             
                                                                                
360.    .700    .260E+04  0.    .419E+06.684E+10  0.       0.000  0.       0.000
  0.        0.00  0.        0.00  0.        0.00  0.        0.00  0.        0.00
.500E-02.700E-02.980E-02.140E-01.190E-01.270E-01.370E-01.520E-01.730E-01.100    
.480E-02.694E-02.978E-02.140E-01.190E-01.270E-01.370E-01.520E-01.730E-01.100    
 138.366 123.400 113.340 106.128 101.813  98.283  96.034  94.289  93.054  92.229
.140    .200    .280    .390    .550    .770    1.10    1.50    2.10    2.90    
.140    .200    .280    .390    .550    .770    1.10    1.50    2.10    2.90    
  91.592  91.114  90.796  90.571  90.405  90.289  90.203  90.149  90.106  90.077
4.10    5.80    8.10    11.0    16.0    22.0    31.0    43.0    60.0    85.0    
4.10    5.80    8.10    11.0    16.0    22.0    31.0    43.0    60.0    85.0    
  90.054  90.038  90.028  90.020  90.014  90.010  90.007  90.005  90.004  90.003

Example of SEISAN PAZ response file using the same constants as above


KBS  B  Z100   1  1  1  0  0  0.000                                          P  
                                                                                
     2    3 0.1089E+10-0.1222E-01 0.1246E-01-0.1222E-01-0.1246E-01     0.       
     0.         0.         0.         0.         0.         0.         0.       
     0.         0.         0.         0.         0.         0.         0.       
     0.                                                                         



Peter Voss : Wed Aug 9 08:16:56 UTC 2017