Description of FFB

This file describes the ISC's Fixed Format Bulletin (.ffb) files. The same format is used for Catalogue files, except that phase records are excluded.

Contents

• Record Sequence
• Treatment of times which fall outside the month.
• Precisions
• Record Formats
• Format 0: Header Record
• Format 1: Epicentre Record
• Format 2: Epicentre Continuation Record
• Format 3: Epicentre Comment
• Format 4: Epicentre Comment Continuation Record
• Format 5: Initial Phase Record
• Format 6: Later Phase Record
• Format 7: Phase Comments Record
• Format 15: Initial Phase Record - 5 Character Codes
• Format 90: Agency Record
• Format 91: Station Record
• Format 99: Null Record
• Numerical Values for Phase Identifications
• Operator ID's
• ISC ID's

Description of FFB
Record Sequence

• One Header record
• Agency records
• These are listed in order of increasing agency number. Numbers 98 and 99 are used internally and are not allocated in this list.
• All allocated agency codes are included whether used in the current issue of the bulletin or not.
• Station records
  • These are listed in order of increasing station number, occasionally numbers will be missing where they had been allocated to stations whose locations are not known.
  • Only stations used to prepare this issue of the bulletin are included. The locations are those used at the time of the preparation of the bulletin.
• Groups of records associated with an event.
  • The events are listed in time order of prime estimate This is the same order as they appear in ISC printed bulletin
  • Each monthly file contains all the events whose prime estimates are within that month.

Each group of records for an event will contain records in the following sequence - The order of the records within an event is the same as in the ISC printed bulletin.

• Non prime estimates section (optional)
• Prime estimate section (essential)
• Station data (optional)

Each estimate section contains records in the following sequence:

The prime estimate must contain a format 1 record. Non-prime estimates must contain either a format 1 or a format 3 record.

Phase data appears in increasing distance of the station from the prime estimate and contains records in the following sequence:

Description of FFB
Treatment of times which fall outside the month.

Events in the last few minutes of a month will sometimes have records associated which are from the next month. These may appear in the file with a day number which follows the last day of the month. No special treatment is made for leap seconds on this file when this happens (although it is accounted for in ISC internal files) For example, a phase on 1991/01/01 at 00h 02m 03.1s associated with an event in 1990 December may have its time recorded in the 199012.FFB file as 1990/12/32 00h 02m 04.1s, the additional second being added because 1990 December contained a leap second.

Commands are continued to next line by last non-blank character being a comma.

Description of FFB
Precisions

Precisions are an indication of the accuracy to which the parameter is known. The integer value of the precision is the power of ten which contains the last significant digit. That is, a precision of -1 indicates a value significant to one decimal place, while a precision of 0 indicates a value significant to the nearest unit.

Time, latitude and longitude have special extra precisions. A full list of precisions found with time is:

Magnitude is sometimes given with precision 8, indicating that values were originally given as fractions 1/4, 1/2, 3/4.

Description of FFB
Record Formats

Each record is described as a sequence of fields. Each field description consists, itself, of a sequence of fields, which are

1. F
2. record type
3. first column number
4. last column number in field
5. field type
   Ix Occupies x columns - leading blanks allowed
   Fx Occupies x columns - leading and trailing blanks allowed
   Ax Occupies x columns - characters
   
6. Null value
   * fixed value - can be used to identify record type
   - no null value allowed
   b null represented by field filled with blanks
   else null value
7. values
8. Comment

Description of FFB
Record Format 0: Header

R  0                        !Header record - format 0
F  0  1 -2 I2  *  0         !Record category
F  0  3 -4 I2  -  IR        !Next record category
F  0  5 -8 I4  -  IY        !Reference year
F  0  9-10 I2  -  1-12      !Reference month number
F  0 11-14 I4  -  IY        !Year - repeated
F  0 15-16 I2  -  1-12      !Month number (repeated)
F  0 17-19 A3  -  'Apr',    !Month name  'Aug','Dec','Feb','Jan','Jul','Jun','Mar','May','Nov','Oct','Sep'
F  0 20-21 I2  -  1         !First day number
F  0 22-23 I2  -  28-31     !Last day number
F  0 24-25 I2  -  64-98     !Last two digits of creation year
F  0 26-27 I2  -  1-12      !Creation month number
F  0 28-29 I2  -  1-31      !Creation day number
F  0 30-35 I6  -  1-10      !Software version
F  0 36-38 I3  -  96        !Record length

Description of FFB
Record Format 1: Epicentre

R  1                        !Epicentre - format 1
F  1  1 -2 I2  *  1         !Record category
F  1  3 -4 I2  -  IR        !Next record category
F  1  5 -8 I4  -  IY        !Reference year
F  1  9-10 I2  -  1-12      !Reference month
F  1 11-12 I2  b  1-28,29,30,31,32   !Day number
F  1 13-14 I2  b  0-23      !Hours
F  1 15-16 I2  b  0-59      !Minutes
F  1 17-20 F4  b  0-5999    !Seconds*100 (F4.2)
F  1 21-22 I2  -  -3,-2,-1,0,1,2,3      !Precision of time
F  1 23-25 I3  -  1-299        !Agency number from 'FIXED'
F  1 26-26 A1  -  'A',        !Prime estimate flag - A=Prime, B-Z others
F  1 27-33 I7  -  -900000-900000     !Latitude * 10**4 (F7.4)
                        !Precision of latitude
F  1 34-35 I2  -  -6,   ! to 1/1000000th degree !!
                  -5,   ! to 1/100000th degree  !!
                  -4,   ! to 1/10000th degree   !!
                  -3,   ! to 1/1000th degree
                  -2,   ! to 1/100th degree
                  -1,   ! to 1/10th degree
                   0,   ! to nearest degree
                   1,   ! to ten degrees !
                   4,   ! degrees, minutes, seconds and tenths of second
                   5,   ! degrees, minutes, seconds
                   6,   ! degrees, minutes and tenths of minutes
                   7,   ! degrees and minutes
                   8    ! fraction of a degree (1/4, 1/2, 3/4)
F  1 36-43 I8  -   -1800000-1800000     !Longitude * 10**4  (F8.4)
 -1800000 to   1800000  1705968     
                      !  Precision of longitude
F  1 44-45 I2  -  -6,   ! to 1/1000000th degree !!
                  -5,   ! to 1/100000th degree  !!
                  -4,   ! to 1/10000th degree   !!
                  -3,   ! to 1/1000th degree
                  -2,   ! to 1/100th degree
                  -1,   ! to 1/10th degree
                   0,   ! to nearest degree
                   1,   ! to ten degrees !
                   4,   ! degrees, minutes, seconds and tenths of second
                   5,   ! degrees, minutes, seconds
                   6,   ! degrees, minutes and tenths of minutes
                   7,   ! degrees and minutes
                   8    ! fraction of a degree (1/4, 1/2, 3/4)
F  1 46-49 I4  b  -100-7700,          ! Depth in kilometres *10 (F4.1)
                  7701-9000
F  1 50-51 I2  99 -3,-2,-1,0              !    Precision of depth
F  1 52-55 F4  b  0-99,100-199,200-299,300-399,400-499,500-599,
                  600-699,700-799,800-899,900-999  ! Magnitude one*100 (F4.2)
F  1 56-59 F4  b  0-999                 !Magnitude one (end of range).  (F4.2)
F  1 60-61 I2  99 -2,-1,0,8             !Magnitude one precision
                                        ! Type of magnitude 1
F  1 62-64 A3  -  '   ',
                  '!  ',                ! error
                  '5. ',                ! error
                  'B  ',                ! body wave magnitude (Mb)
                  'C  ',                ! coda length magnitude
                  'D  ',                ! duration magnitude
                  'L  ',                ! Local
                  'N  ',                ! Nuttli
                  'S  ',                ! Surface wave
                  'SZ ',                ! Surface wave on vertical component
                  'W  '                ! Moment
F  1 65-67 I3  b  0,1-9,   !Number of observations contributing to magnitude one
                  10-19,20-49,50-99,100-199,200-299,300-399,400-999
                  null  1392982
F  1 68-70 I3  b  0-99,100-999   !Standard error for magnitude one (F3.2)
F  1 71-72 I2  99 -2--1   !Precision of standard error for magnitude one
F  1 73-76 I4  b  1-729   !Geographical region number - (prime estimates)
F  1 77-79 I3  b  1-52    !Seismic region number - (prime estimates)
F  1 80-83 I4  b  0,1-9,10-99,100-999,1000-9999  !Number of observations
F  1 84-87 I4  b  0-9, !Standard deviation of one observation*100 (F4.2)
                  10-99,100-999,1000-9999
F  1 88-89 I2  99 -2,-1  !Precision of standard deviation of one observation
F  1 90-93 I4  b  1-9,  !Observations contributing to standard deviation
                  10-99,100-999,1000-9999

Description of FFB
Record Format 2: Epicentre Continuation

R  2
F  2  1 -2 I2  *  2         !Record category
F  2  3 -4 I2  -  IR        !Next record category
F  2  5 -8 I4  -  IY        !Reference year
F  2  9-10 I2  -  1-12      !Reference month
F  2 11-14 F4  b  0-99,     !Magnitude two (F4.2)
                  100-199,200-299,300-399,400-499,500-599,
                  600-699,700-799,800-899,900-999
                  null   929008
F  2 15-18 F4  b  0-999     !Magnitude two (end of range) (F4.2)
F  2 19-20 I2  99 -2--1,0,8   !Magnitude two precision (=99 for null or for rang
                                !Type of magnitude two
F  2 21-23 A3  -  '   ',
                  '!  ',                ! error
                  '5. ',                ! error
                  'B  ',                ! body wave magnitude (Mb)
                  'C  ',                ! coda length magnitude
                  'D  ',                ! duration magnitude
                  'L  ',                ! Local
                  'N  ',                ! Nuttli
                  'S  ',                ! Surface wave
                  'SZ ',                ! Surface wave on vertical component
                  'W  '                 ! Moment
F  2 24-26 I3  b  0,1-9,       !Number of obs. contributing to magnitude two
                  10-99,100-999
F  2 27-29 I3  b  0-998,999 !Standard error for magnitude two (F3.2)
                  null  1004963
F  2 30-31 I2  99 -2,0         !Precision of s.e. for magnitude two
F  2 32-36 I5  b  0-9,      !Standard error for origin time (F5.3)
                  10-99,100-999,1000-9999,10000-99998,99999
F  2 37-38 I2  99 -6,-5,-4,-3,-2,-1,0       !Precision of s.e. for origin time
F  2 39-44 I6  b  0-9,             !Standard error latitude (degrees) (F6.4)
                  10-99,100-999,1000-9999,10000-99999,100000-999998,999999
F  2 45-46 I2  99 -7,-6,-5,-4,-3,-2,-1,0       !Precision of s.e. for latitude
F  2 47-52 I6  b  0-9,             !Standard error longitude (degrees) (F6.4)
                  10-99,100-999,1000-9999,10000-99999,100000-999998,999999
F  2 53-54 I2  99 -7,-6,-5,-4,-3,-2,-1,0       !Precision of s.e. for longitude
F  2 55-58 I4  b  0-9,             !Standard error for depth (km) (F4.1)
                  10-99,100-999,1000-9998,9999
F  2 59-60 I2  99 -4,-3,-2,-1,0             !Precision of s.e. for depth
F  2 61-61 A1  -  ' ',             ! Explosion/effects flag:
                  'C',  ! Collapse of nuclear explosion
                  'D',  ! Damaging natural earthquake
                  'F',  ! Felt natural earthquake
                  'H',  ! Chemical explosion
                  'M',  ! Event associated with mining
                  'N',  ! Nuclear explosion or presumed nuclear explosion
                  'R'   ! Rockburst
F  2 62-64 I3 b  0-999  !Mantissa of explosion charge size in tons (F3.2)
F  2 65-66 I2 b  -1-10   !Exponent of explosion charge size
F  2 67-68 I2 99 -3,-2,-1,0,1,3,5      !Precision of explosion charge size
F  2 69-71 I3 b  1-9,   !Number of pP-P observations
                 10-99,100-999
F  2 72-75 I4 b  0-9,  !Std. deviation of 1 pP-P observation F4.2
                 10-99,100-999,1000-9998,9999
F  2 76-80 I5 b -1500--1,     !Depth from pP-P observations (km) F5.2
                 0-9999,10000-19999,20000-29999,30000-39999,40000-69999,
                 70000-77000
F  2 81-85 I5 b  0-9,  !Std. error of depth from pP-P observations(km) F5.2
                 10-99,100-999,1000-1999,2000-4999,5000-9999,10000-99999
F  2 86-87 I2 b  0-12   !Maximum intensity
F  2 88-88 A1 -  ' ','A'        !Intensity scale
F  2 89-91 I3 b  0-2,   !Distance in degrees to closest observation
                 3-5,6-9,10-89,90-180
F  2 92-94 I3 b  0-5,6-9,10-89,90-180  !Degrees to most distant observation

Description of FFB
Record Format 3: Epicentre Comment

R  3
F  3  1 -2 I2  *  3         !Record category
F  3  3 -4 I2  -  IR        !Next record category
F  3  5 -8 I4  -  IY        !Reference year
F  3  9-10 I2  -  1-12      !Reference month
F  3 11-12 I2  -  1-28,29,30,31          ! Days
F  3 13-14 I2  -  0-23          !Hours
F  3 15-16 I2 -   0-59          !Minutes
F  3 17-20 I4 -   0-5999,6000-6099        !Seconds (F4.2)
F  3 21-23 I3 -   1-299         !Agency number
F  3 24-24 A1 -   AZ            !Prime-estimate flag
F  3 25-96 A72 -  TX            !Comment

Description of FFB
Record Format 4: Epicentre Comment Continuation

R  4
F  4  1 -2 I2  *  4         !Record category
F  4  3 -4 I2  -  IR        !Next record category
F  4  5 -8 I4  -  IY        !Reference year
F  4  9-10 I2  -  1-12      !Reference month
F  4 11-12 I2  -  1,2-4,5-9,10-19,20-50      !Serial number (starting at 1)
F  4 13-96 A84 -  TX        !Comment text

Description of FFB
Record Format 5: Initial Phase

R  5
F  5  1 -2 I2  *  5         !Record category
F  5  3 -4 I2  -  IR        !Next record category
F  5  5 -8 I4  -  IY        !Reference year
F  5  9-10 I2  -  1-12      !Reference month
F  5 11-14 A4  -  AS        !Station code
F  5 15-18 I4  -  1-3000        !Station number
F  5 19-19 A1 -  ' ','A'        !Network code
                                ! A Australia
F  5 20-20 A1 -  ' ',           !Source code
                 '.',
                 '0',
                 '1',
                 '2',
                 '3',
                 '4',
                 '5',
                 '6',
                 '7',
                 '8',
                 '9',
                 'B',
                 'D',
                 'E',
                 'I',
                 'J',           ! Japan Meteorolgical Agency
                 'L',
                 'M',
                 'S',
                 'T',
                 'U',           ! USA  (NEIS)
                 'W'
F  5 21-21 A1 -  ' ',           ! Format received code
                 '1',           ! ISC format 1
                 '2',           ! ISC format 2
                 '3',           ! ISC format 3
                 'B',           ! Blacknest format ?
                 'F',           ! ISC P=V format
                 'N',           ! NEIS tape format
                 'U'            ! NEIS PDE
F  5 22-22 A1 - ' ',            ! Local - Teleseismic flag
                'L',            ! Local
                'T'             ! Teleseismic
F  5 23-25 I3 - 0-359           !Azimuth in degrees from epicentre to station
F  5 26-30 I5 - 0-18000         !Distance in degrees F5.2
F  5 31-33 I3 - 1-50            !Number of phases in this observation
F  5 34-35 I2 - 1-28,29,30,31,32            !Days
F  5 36-37 I2 - 0-23            !Hours
F  5 38-39 I2 - 0-59            !Minutes
F  5 40-43 I4 - 0-5999          !Seconds F4.2
F  5 44-45 I2 99 -3,-2,-1,0,1,2      !Precision of time
F  5 46-48 I3 999 0-199      !Operator's ID (numerical): see table at end
F  5 49-56 A8 -         ' ',    !Operator's ID (characters)
                                List of all operator phases ids ever, including rubbish
F  5 57-60 I4 - -999,        ! Operator's residual F4.1
               -998--100,-99--10,-9--1,0,1-9,10-99,100-999,1000-9998,9999
F  5 61-63 I3 999 0,       !ISC ID (numerical): null as 999
             1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
             20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,
             40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,
             60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
             80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,
             100,101,102,103,104,105,106,107,108,109,
             110,111,112,113,114,115,116,117,118,119,
             120,121,122,123,124,125,126,127,128,129
F  5 64-67 I4 - -999,         !ISC residual F4.1
               -998--100,-99--10,-9--1,0,1-9,10-99,100-999,1000-9998,9999
F  5 68-68 A1 - ' ',    ! Direction of first motion:
                '+',    ! Short period compression
                '-',    ! Short period dilatation
                '1',    ! Long period compression
                '2',    ! Long period dilatation
                '3',
                '4',
                '5',
                '6',
                '7',
                '?',
                'A',    ! Compression on short and long period
                'B',    ! Compression short period, dilatation long period
                'C',    ! Compression (period unspecified)
                'D',    ! Dilatation (period unspecified)
                'E',    ! East
                'J',    ! Dilatation short period, compression long period
                'K',    ! Dilatation on short and long period
                'N',    ! North
                'R',
                'U',
                'W',    ! West
                '\',
                'c'
F  5 69-69 A1 - ' ',    !Instrument type - component is sometimes reported here
                'B',    ! broad band
                'E',    ! East-West component!
                'H',    ! Hilbert transform
                'N',    ! North-South component!
                'S',    ! short period
                'Z',    ! vertical component!
                'l'
F  5 70-70 A1 - ' ',    !Component:
                'D',    ! Down
                'E',    ! East
                'H',    ! Horizontal
                'L',
                'N',    ! North
                'P',
                'R',
                'S',    ! South
                'T',    !
                'U',    ! Up
                'W',    ! West
                'Z'     ! Vertical
F  5 71-71 A1 - ' ',    ! Sharpness:
                '2',    ! error
                '9',    ! error
                'U',    ! error
                'e',    ! Emergent
                'i',    ! Impulsive
                'l'     ! ??
F  5 72-72 A1 - ' '                     !Signal-to-noise ratio
F  5 73-75 I3 b -10--1,             !Log A/T (F3.1)
                0,1-10,11-20,21-30,31-40,41-50,51-60,61-70,71-80,81-90
F  5 76-77 I2 99 -5,-1,0           !Precision of log A/T
                ! -5 ???
                ! -1 to one tenth
                !  0 to nearest unit
F  5 78-81 I4 b 0,1-9,          !Mantissa of amplitude (F4.3)
                10-99,100-999,1000-9999
F  5 82-83 I2 b 0,1,2,3,4,5,6,7,8,9    !Exponent of amplitude
F  5 84-85 I2 99 -2,-1,0,1,2,3     !amplitude units
                ! 0 amplitude in nanometres
                ! 3 amplitude in micrometres
                !   any other values are erronoeous
F  5 86-89 I4 b  0,1-9,10-99,100-999    !Period in seconds (F4.1)
F  5 90-91 I2 99  -5,-4,-2,-1,0,1       !Precision of period
F  5 92-93 I2 b -10--1,           !Magnitude (F2.1)
                 0-9,10-19,20-29,30-39,40-49,50-59,60-69,70-79,80-89,90-99

Description of FFB
Record Format 6: Later Phase

R  6
F  6  1 -2 I2  *  6         !Record category
F  6  3 -4 I2  -  IR        !Next record category
F  6  5 -8 I4  -  IY        !Reference year
F  6  9-10 I2  -  1-12      !Reference month
F  6 11-12 I2  -  2,3,4,5,6,7,8,9,10-19,20-29,30-39,40-50  !Phase count
F  6 13-14 I2  b  0-28,29,30,31,32                  !Days
F  6 15-16 I2  b  0-23                  !Hours
F  6 17-18 I2  b  0-59                  !Minutes
F  6 19-22 I4  b  0-5999                !Seconds (F4.2)
F  6 23-24 I2  99 -3,-2,-1,0,1,2,3,4    !Precision of time
F  6 25-27 I3 999 0,         !Operator's ID (numerical)
             1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
             20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,
             40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,
             60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
             80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,
             100,101,102,103,104,105,106,107,108,109,
             110,111,112,113,114,115,116,117,118,119
F  6 28-35 A8  -  ' ',   ! Operator's ID (characters) (incl. rubbish)
                                List of all operator phases ids ever, including rubbish
2F  6 36-39 I4  -  -999,             !Operator's residual in seconds (F4.1)
                  -998--100,-99--10,-9--1,0,
                        1-9,10-99,100-999,1000-9998,9999
F  6 40-42 I3 999 0,      !ISC ID (numerical)
             1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
             20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,
             40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,
             60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
             80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,
             100,101,102,103,104,105,106,107,108,109,
             110,111,112,113,114,115,116,117,118,119
F  6 43-46 I4 9999 -999,            !ISC residual in seconds (F4.1)
                   -998--100,-99--50,-49--10,-9--1,0,
                        1-9,10-49,50-99,100-999,1000-9998
F  6 47-47 A1  -  ' ',            ! Direction of first motion:
                '+',    ! Short period compression
                '-',    ! Short period dilatation
                '1',    ! Long period compression
                '2',    ! Long period dilatation
                'A',    ! Compression on short and long period
                'B',    ! Compression short period, dilatation long period
                'C',    ! Compression (period unspecified)
                'D',    ! Dilatation (period unspecified)
                'J',    ! Dilatation short period, compression long period
                'K'     ! Dilatation on short and long period
F  6 48-48 A1 - ' ',    ! Instrument type:
                'B',    ! broad band
                'E',
                'H',    ! Hilbert transform
                'N',
                'S',     ! short period
                'Z'
F  6 49-49 A1 - ' ',    !Component:
                'D',    ! down
                'E',    ! East
                'H',
                'L',
                'N',    ! North
                'P',
                'R',    ! radial
                'S',    ! South
                'T',    ! tangential
                'U',    ! up
                'W',    ! West
                'X',    ! vertical
                'Y',    ! vertical
                'Z'     ! vertical
F  6 50-50 A1 - ' ',            !Sharpness:
                'e',            !   Emergent
                'i'             !   Impulsive
F  6 51-51 A1  -  ' '           !Signal-to-noise ratio
F  6 52-54 I3  b  -10--1,0-90   !Log A/T (F3.1)
F  6 55-56 I2 99  -1            !Precision of log A/T
F  6 57-60 I4  b  0-999,        !Mantissa of amplitude in millimicrons (F4.3)
                  1000-1999,2000-2999,3000-3999,4000-4999,5000-5999,
                  6000-6999,7000-7999,8000-8999,9000-9998,9999
F  6 61-62 I2  b  0,1,2,3,4,5,6,7,8,9,10          !Exponent of amplitude
F  6 63-64 I2 99  -2,-1,0,1,2,3   !Precision of amplitude
F  6 65-68 I4  b  0-99,      !Period in seconds (F4.1)
                  100-199,200-499,500-999,1000-9999
F  6 69-70 I2 99  -2,-1,0          !Precision of period
F  6 71-72 I2  b  0,          !Magnitude (F2.1)
                  10-19,20-29,30-39,40-49,50-59,60-69,70-79,80-89,90-99

Description of FFB
Record Format 7: Phase Comments

R  7
F  7  1 -2 I2  *  7         !Record category
F  7  3 -4 I2  -  IR        !Next record category
F  7  5 -8 I4  -  IY        !Reference year
F  7  9-10 I2  -  1-12      !Reference month
F  7 11-12 I2  -  1-5,6-10,11-20   !Count of comment records for this station
F  7 13-96 A84 -  TX        !Comment

Description of FFB
Format 15: Initial Phase Record - 5 Character Codes

Format 15 is identical to Format 5, except that the fifth character of the station code is appended after all of the other fields, in position 94

Description of FFB
Record Format 90: Agency

R 90                        !Agency record
F 90  1 -2 I2  *  90        !Record category
F 90  3 -4 I2  -  IR        !Next record category
F 90  5 -8 I4  -  IY        !Reference year
F 90  9-10 I2  -  1-12      !Reference month
F 90 11-13 I3  -  1-999     !Agency number
F 90 14-19 A6  -  AD        !Agency code
F 90 20-21 I2  -  0-10      !Record number
F 90 22-96 A75 -  TX        !Name and address lines

Description of FFB
Record Format 91: Station

R 91                        !Station record
F 91  1 -2 I2  *  91        !Record category
F 91  3 -4 I2  -  IR        !Next record category
F 91  5 -8 I4  -  IY        !Reference year
F 91  9-10 I2  -  1-12      !Reference month
F 91 11-14 I4  -  1-9999    !Station number
F 91 15-19 A5  -  TX        !Station code
F 91 20-22 A3  -  '   '     !Blank
F 91 23-40 A18 -  TX        !Station name
F 91 41-61 A21 -  TX        !Geographical or political region
F 91 62-63 I2  -  0-90      !Latitude degrees
F 91 64-65 I2  -  0-59      !Latitude minutes
F 91 66-68 F3  b  0-599     !Latitude seconds*10
F 91 69-69 A1  -  'N','S'
F 91 70-72 I3  -  0-179     !Longitude degrees
F 91 73-74 I2  -  0-59      !Longitude minute
F 91 75-77 F3  b  0-599     !Longitude seconds*10
 There were some excessively large values (above 599) in the above field.
 The following values were originally present
  SLN was 700 seconds between 196410 and 196611
  PHC was 900 seconds for 196503
  SVW was 600 seconds between 196710 and 196812

F 91 78-78 A1  -  'E','W'
F 91 79-82 I4  b  -999--100,-99--1,0-6000  !Height above sea level in metres
F 91 83-83 A1  -  ' ','W'        !W = for world-wide standard stations

Description of FFB
Record Format 99: Null

Null records occur only near the end of a file. Null records originally padded out files to a multiple of a blocking factor. They have been removed from files on ISC CDs.

R 99                        !Null record
F 99  1 -2 I2  *  99        !Record category
F 99  3 -4 I2  -  IR        !Next record category
F 99  5 -8 I4  -  IY        !Reference year
F 99  9-10 I2  -  1-12      !Reference month

Description of FFB
Numerical Values for Operator Phase IDs

  0 P       37 SSS     74 PN
  1 PP      38 SCS     75 SN
  2 PPP     39 SKS     76 PGPG
  3 PCP     40 SKKS    77 SGSG
  4 PKP     41 SKKKS   78 LR
  5 PKP2    42 SCSPKP  79 LQ
  6 PKPPKP  43 SKSSKS  80 L
  7 PCPPKP  44 SCSP    81 PHASE81
  8 PS      45 SKSP    82 PHASE82
  9 PPS     46 SCP     83 SPP
 10 PCS     47 SP      84 PHASE84
 11 PKS     48 SKP     85 SPECIAL
 12 PKKS    49 SKKP    86 QM
 13 PCSPKP  50 SKPPKP  87 RM
 14 PKPPKS  51 SSP     88 T
 15 PKPSKS  52 PHASE52 89 T(MAX)
 16 PKKP    53 PHASE53 90 NORTH
 17 3PKP    54 PHASE54 91 SOUTH
 18 PKIKP   55 PHASE55 92 EAST
 19 PKP1    56 PHASE56 93 WEST
 20 PKHKP   57 sPKP2   94 UP
 21 PHASE21 58 pPCP    95 DOWN
 22 PSS     59 pPKP    96 E
 23 PHASE23 60 pP      97 I
 24 PHASE24 61 pPP     98 MAXIMUM
 25 PHASE25 62 sP      99 FINAL
 26 PHASE26 63 sPKP   100 S/SKS
 27 PHASE27 64 sS     102 PX
 28 PHASE28 65 sSS    101 P/PKP
 29 PHASE29 66 sPP    103 X1
 30 PHASE30 67 sPCP   104 X2
 31 PHASE31 68 sSCS   105 SX
 32 PHASE32 69 pPKP2  106 SB1
 33 PHASE33 70 P*     107 SB2
 34 PHASE34 71 S*     108
 35 S       72 PG     109 S/(SKS)
 36 SS      73 SG     110 (S)/SKS
                      111 PFAKE

Notes:
• The interpretations such as PHASE21 imply that the phase identification was sent to ISC as the numeric code 21. We do not have a phase corresponding to this code.
• S/(SKS) implies that the phase was reported to ISC as S/SKS; we have identified it as an S phase. (S)/SKS indicates identification as an SKS phase.
• 999 indicates that the phase was not identified.
• An asterisk preceeding an upper case letter indicates that the letter should be treated as a lower case letter. e.g. for *PP read pP.

Description of FFB
Numerical Values for ISC Phase IDs

  0 P       37 SSS     74 PN       121 rx
  1 PP      38 SCS     75 SN       122 SPS
  2 PPP     39 SKS     76 PGPG     123 Sx
  3 PCP     40 SKKS    77 SGSG     124 tx
  4 PKP     41 SKKKS   78 LR       125 x
  5 PKP2    42 SCSPKP  79 LQ
  6 PKPPKP  43 SKSSKS  80 L
  7 PCPPKP  44 SCSP    81 PKKP3
  8 PS      45 SKSP    82 PKKS3
  9 PPS     46 SCP     83 SPP
 10 PCS     47 SP      84 PHASE84
 11 PKS     48 SKP     85 P DIFF
 12 PKKS    49 SKKP    86 QM
 13 PCSPKP  50 SKPPKP  87 RM
 14 PKPPKS  51 SSP     88 T
 15 PKPSKS  52 SKP2    89 T(MAX)
 16 PKKP    53 SKS2    90 NORTH
 17 3PKP    54 SKKS2   91 SOUTH
 18 PKIKP   55 SKKS3   92 EAST
 19 PP2     56 SKKKS2  93 WEST
 20 PPP2    57 sPKP2   94 UP
 21 PKS2    58 pPCP    95 DOWN
 22 PSS     59 pPKP    96 E
 23 PSS2    60 pP      97 I
 24 SSP2    61 pPP     98 MAXIMUM
 25 PCPPKP2 62 sP      99 FINAL
 26 PCSPKP2 63 sPKP   100
 27 SS2     64 sS     111 PFAKE
 28 PKKP2   65 sSS    112 A
 29 PKKS2   66 sPP    113 AMB
 30 SCSPKP3 67 sPCP   114 AML
 31 SCSPKP2 68 sSCS   115 AMS
 32 SCSP2   69 pPKP2  116 Lg
 33 SKSP2   70 P*     117 MLR
 34 SSS2    71 S*     118 Px
 35 S       72 PG     119 PSP
 36 SS      73 SG     120 PSS

Note: 100 implies no ISC identification.

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Last modified: Wed Jun 23 13:13:51 BST 1999