Northridge Portable Instrument Station Parameter Files   
       ---------------------------------------------------------------

   There are four separate directories (GEOS, KINEMETRICS, SCEC, and SCSN)
each containing it's own stapar directory. These are organized according
to the group that contributed the data. Instrument response functions for
the contributing TERRAscope stations were obtained with SEED data available
from the IRIS DMC at the University of Washington state.

   Station parameter (stapar) files contain information regarding station
location, sensors, dataloggers, and recording parameters as they change
with time. They are named by date (YYDDDHHMMSS.msS) where the date reflects
the time of the parameter changes.
   The response/ directory contains the "RponseFile" and "FilterResponseFiles"
files containing the corresponding poles and zeroes and FIR filter coefficient
files. 
   Stapar files are broken up into 4 distinct sections containing information
regarding different aspects of the data. These four sections are defined
below:


Site ? _SID __Latitude _Longitude _Elevation N-offset E-offset V-offset
--------------------------------------------------------------------------------
Site              station code
?                 is the station up? (Y/N)
SID               station ID number (usually internal to stapar files) 
Latitude          station latitude (decimal)
Longitude         station longitude (decimal) 
Elevation         station elevation (meters) 
N-offset          station north offset from reference site (if any) (meters)
E-offset          station east offset from reference site (if any) (meters)
V-offset          station vertical offset from reference site (if any) (meters)


Site Comp Type Serial Theta Phi ____Freq ____Damp ____Coil RponseFile Sens Depth
--------------------------------------------------------------------------------
Site              station code
Comp              component name (channel number or sensor code)
Type              sensor type (VEL, ACC, etc)
Serial            sensor serial number
Theta             sensor vertical orientation (degrees from up) 
Phi               sensor horizontal orientation (degrees clockwise from north)
Freq              natural frequency of sensor
Damp              damping coefficient of sensor
Coil              generator constant of sensor (ie V/cm/s)
RponseFile        reference to file containing sensor response (poles and zeroes)
Sens              3 letter sensor code (SEED convention)
Depth             sensor depth (meters)


_SID Serial DataLogger SampleRate FilterResponseFiles___________________________
--------------------------------------------------------------------------------
SID               station ID number (usually internal to stapar files)
Serial            datalogger serial number
DataLogger        datalogger type 
SampleRate        sample rate
FilterResponseFiles   reference to file(s) containing filter response 
                      (poles and zeroes, or FIR coefficients)


_SID Comp dbPreAmp __dbGain Corner Roll Counts/V HighCorner _HPR
--------------------------------------------------------------------------------
SID               station ID number (usually internal to stapar files)
Comp              component number
dbPreAmp          gain of input amplifier (if any) (dB)
dbGain            gain of amplifier (dB) 
Corner            corner frequency of AAF or sample rate decimation filters (Hz)
Roll              frequency roll-off per octave of AAF or final FIR filters (dB)
Counts/V          datalogger digitization constant
HighCorner        corner frequency of input low pass filter (if any) (Hz)
HPR               frequency roll-off per octave of input low pass filter (if any) 
                  (dB)