Description of FFB files
This file describes the ISC's Fixed Format Bulletin (.ffb) files, which are available on the ftp site and on the Bulletin CDs. The same format is used for the Catalogue files (again, only on the ftp site or Bulletin CDs), 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
Record Sequence
Within the file the records are in the following 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:
| EPICENTRE RECORD | (FORMAT 1) (optional) |
| EPICENTRE CONTINUATION RECORD | (FORMAT 2) (optional) |
| EPICENTRE COMMENT | (FORMAT 3) (optional) |
| EPICENTRE COMMENT CONTINUATION RECORD | (FORMAT 4) (optional) |
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:
| INITIAL PHASE RECORD | (FORMAT 5 or 15) (essential) |
| LATER PHASE RECORD(S) | (FORMAT 6) (optional) |
| PHASE COMMENTS RECORD(S) | (FORMAT 7) (optional) |
| 3 | to nearest 1/10th minute |
| 2 | to nearest minute |
| 1 | to nearest ten seconds |
| 0 | to nearest second |
| 1 | to 1/10th second |
| 2 | to 1/100th second |
Magnitude is sometimes given with precision 8, indicating that values were originally given as fractions 1/4, 1/2, 3/4.
Record Formats
Each record is described as a sequence of fields. Each field description consists, itself, of a sequence of fields, which are
- F
- record type
- first column number
- last column number in field
- field type
Ix Occupies x columns - leading blanks allowed
Fx Occupies x columns - leading and trailing blanks allowed
Ax Occupies x columns - characters - 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 - values
- Comment
- 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.
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
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
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
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
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
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)
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
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)
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
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
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
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
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
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
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)/SKSNotes:
Numerical Values for ISC 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 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 28 PKKP2 65 sSS 29 PKKS2 66 sPP 30 SCSPKP3 67 sPCP 31 SCSPKP2 68 sSCS 32 SCSP2 69 pPKP2 33 SKSP2 70 P* 34 SSS2 71 S* 35 S 72 PG 36 SS 73 SG
Note: 100 implies no ISC identification.
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