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Last modified 16 months ago Last modified on 05/29/12 10:43:27

## Hypoinverse Station File Format

    FORMAT OF THE HYPOINVERSE STATION FILE FOR FULL 12-LETTER (S-C-N-L) CHANNEL NAMES

    The channel identifier consists of a 5-letter site code, a 2-letter network
    code unique to the owner or operator of the network, a 3-letter component
    or channel code, and a 2-letter location code.  The net, component, and
    location fields are optional to Hypoinverse, but space for these fields will
    be reserved in all input and output files.  The user of Hypoinverse may specify
    (with the LET command) how many characters (counted from the left side) in
    each field to use when matching names in station and phase files.  Full use
    of the fields will require 5, 2, 3, and 2 letters; minimum use will require
    3, 0, 0 and 0 letters.  Hypoinverse can use both a 1-letter (old USGS style)
    and 3-letter (SEED style) component field. Space for both fields will be
    reserved in all input and output files. Select whether to use the 1- or 3-letter
    field for matching station and phase names with the LES command.  It is
    sometimes useful to keep the 1-letter component field for easier recognition by
    analysts than the newer, more general 3-letter field.

    Cols.   Format	Data
    _____   ______ 	____

    1-5	A5,1X	Station site code. The first character may  not  be  a
    		number or the $ character.

    7-8	A2,1X	Station network code.

    10	A1	Optional 1-letter component code for this channel.
    11-13	A3,1X	3-letter component code for this channel.

    15 	A1	Station weight code (in units of 0.1) by which the weights
     		assigned each P & S phase  are  to be multiplied.  Use the
    		digits  0-9  for the weight in tenths; "*" or "0"  for  no
    		weight; or any other character  (including blank) for full
    		weight.

    16-17	I2, 1X	Latitude, degrees.
    19-25	F7.4	Latitude, minutes.
    26	A1	N or blank for north latitude, S for south.
    27-29	I3, 1X	Longitude, degrees.
    31-37	F7.4	Longitude, minutes.
    38	A1	W or blank for west longitude, E for east.

    39-42	4X	Reserved for elevation in m. Not used by HYPOINVERSE.

    43-45	F3.1,2X	Default  period  (in sec) at which the  maximum  amplitude
      		will be read for this station. Must be greater than 0.1.
                    If period is given on phase card, it overrides this value.

    48      A1          Put  a "2" or "A" here to designate this as  an  alternate
                        crust model station.  Both  alternate  and primary crustal
                        models  must be in use.  Stations may also be  tagged  for
                        use with an alternate model in the delay file.

    49      A1          Optional station remark field to copy to print output.
    50-54   F5.2, 1X    P delay (sec) for delay set 1.
    56-60   F5.2, 1X    P delay (sec) for delay set 2.
    62-66   F5.2        Amplitude magnitude correction.  If in the range +/-2.4, the
                        correction is included  (by  addition)  in  the  amplitude
                        magnitude. If you don't want a station's magnitude used in
                        the event magnitude, use  a  correction  of  5.0  plus the
                        actual correction.  You can also assign a zero weight (see
                        next).

    67      A1          Amplitude magnitude weight code.  Codes 0-9, "*" and blank
                        are the same as the P & S weight codes (col 15). The actual
                        magnitude weight used is the product of those on the station
                        and phase cards. See also col 62.

    68-72   F5.2        Duration  magnitude  correction  (works  the  same  as the
                        amplitude magnitude correction).

    73      A1          Duration  magnitude  weight code (works the  same  as
                        the amplitude weight code).

    74      I1          Instrument  type code for this station used to select  the
                        appropriate response curve  to  derive  an equivalent Wood
                        Anderson amplitude. Must be either 0, 1 or 2:
                            0: Standard Wood-Anderson torsion seismograph.
                            1: USGS standard (1 HZ geophone, .7 critical damping.)
                            2: Hawaii-type Sprengnether seismometer.

    75-80   F6.2        Calibration factor for amplitude  magnitudes, equal to the
                        peak-to-peak  amplitude of a 10 microvolt RMS signal at  5
                        hz  applied  to  the  VCO   and  measured  in  mm  on  the
                        Develocorder  film  viewer.  For instrument types 0 and  2
                        this  should  generally  be  1.0.   A  cal  factor  of 0.0
                        signifies  an  unknown  response for  which  no  amplitude
                        magnitudes will be computed. If a cal factor is given on a
                        phase  card it overrides this value.  The VCO  attenuation
                        may be given in  place  of  the  cal  factor  (see the ATN
                        command).  An entire history of station attenuations  with
                        the  dates  of  attenuation  changes  may  be  read from a
                        separate file with the ATE command.

    81-82   A2          2-letter location code.
                        Earthworm follows the SEED convention of allowed characters
                        (A-Z, 0-9, space).  In apparent contradiction to the previous
                        statement, Earthworm uses the character '-' to represent
                        'space' in all Earthworm I/O. Just remember to think 'space'
                        when you see '-'. Lower case alphanumerics are not permitted.
                        The location code should always contain 2 characters, either
                        two alpha-numeric characters or two spaces ('--' or '  ').
                        The use of a single space (or '-') adjacent to an alpha-numeric
                        is not permitted.

Other details of hypoinverse configuration can be found in the complete Hypoinverse documentation maintained by Fred Klein at:

- ​ftp://ehzftp.wr.usgs.gov/klein/hyp2000/docs/hyp2000-1.0.pdf
- ​ftp://ehzftp.wr.usgs.gov/klein/docs/shadow2000.pdf

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