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U2 CN DCD Ekofisk PASIV SEGD Stewart A. Levin. dd if=/scratch/Ekofisk_Passive/EKOFISK-4D__TAPE03 bs=1024 count=20 | xxd –a > tmp.txt Input File Blocksize#

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Presentation on theme: "U2 CN DCD Ekofisk PASIV SEGD Stewart A. Levin. dd if=/scratch/Ekofisk_Passive/EKOFISK-4D__TAPE03 bs=1024 count=20 | xxd –a > tmp.txt Input File Blocksize#"— Presentation transcript:

1 U2 CN DCD Ekofisk PASIV SEGD Stewart A. Levin

2 dd if=/scratch/Ekofisk_Passive/EKOFISK-4D__TAPE03 bs=1024 count=20 | xxd –a > tmp.txt Input File Blocksize# Blocks File offset Base 16 Contents Base 16 Contents ASCII 0000000: 3901 8058 1234 5678 9000 1112 9708 2020 9..X.4Vx...... 0000010: 4700 0000 0000 2010 009 f f f 01 9600 01 f f G.............. 0000020: 0000 0000 0000 0001 0000 0100 0000 0027...............' 0000030: 1000 0200 0000 0000 0000 0000 0000 0000................ 0000040: 0101 0000 1388 0000 0054 1000 0223 0293.........T...#.. 0000050: 0000 0000 0000 0000 0000 0000 0300 0101................ 0000060: 0102 0000 1388 0000 0091 1000 0223 0293.............#.. 0000070: 0000 0000 0000 0000 0000 0000 0300 0201................ 0000080: 0103 0000 1388 0000 0138 1000 0223 0293.........8...#.. 0000090: 0000 0000 0000 0000 0000 0000 0300 0301................ 00000a0: 0104 0000 1388 0000 0182 1000 0223 0293.............#.. ●

3 0000000: 3901 8058 1234 5678 9000 1112 9708 2020 9..X.4Vx...... 0000010: 4700 0000 0000 2010 009f ff01 9600 01ff G.............. SEG-D General Header Block 1

4 Value DescriptionNotes 3901File number In the event the file number is greater than 9999, this field is set to ffff and the file number appears in General Header Block #2. 8058Format code8058 is IEEE 32 bit floating point 123456789000General constantsUnused by OptoPlan 11Last two digits of yearYear 2011 1No. additional blocks in General HeaderEach is 32 bytes 297Julian day (1 ‑ 366) Day of year counting from Jan 1. Julian day 297 is October 24 in non-leap years. 8Hour of day (0 ‑ 23) 20Minute of hour (0 ‑ 59) 20Second of minute (0 ‑ 59)Actually could be 60 for rare leap seconds 47Manufacturer’s code47 is assigned by the SEG to OptoPlan 0Manufacturer’s serial no. 0Bytes per scanNot applicable for these data

5 SEG-D General Header Block 1 Value DescriptionNotes 32 (20 16 )Base scan interval Binary value in multiples of 1/16 th of a millisecond. Here the base scan interval is 2 msec. 1Polarity code Untested by OptoPlan (Should be 0 if untested. 1 is zero phase.) 0Scans/blockNot applicable for these data 9Record type9 = normal, 2 = test fffRecord lengthfff means value is in GH Block #2 1Scan type/record1 = all traces same length and sample rate 96No. channel sets per scan type A channel set is a grouping of traces having some common feature. Here the feature is originating from the same cable and component of the 4-C receivers. 0No. sample skew blocksNot applicable for these data 1Extended header length (32 byte blocks)Here there is just one extended header ffExternal header length (32 byte blocks)ff means value is in GH Block #2

6 0000020: 0000 0000 0000 0001 0000 0100 0000 0027...............' 0000030: 1000 0200 0000 0000 0000 0000 0000 0000................ SEG-D General Header Block 2

7 ValueDescriptionNotes 0Extended file number Used for file numbers greater than 9999. 0Extended channel sets/scan typeUsed if larger than 99 0Extended header blocksUsed if larger than 99 256External header blocksUsed if larger than 99 0Not usedUndefined in SEG-D standard 1.0SEG-D Revision Number Major version and minor update numbers 0Number of blocks of General Trailer 10000 (2710 16 )Extended record lengthmilliseconds 0Not usedUndefined in SEG-D standard 2General Header Block Number 0Not usedUndefined in SEG-D standard

8 0000040: 0101 0000 1388 0000 0054 1000 0223 0293.........T...#.. 0000050: 0000 0000 0000 0000 0000 0000 0300 0101................ SEG-D Channel Set Header

9 ValueDescriptionNotes 1Scan type number 1Channel set numberFF for numbers greater than 99 0Channel set start time/2Multiples of 2 msec 5000 (1388 16 )Channel set end time/2Multiples of 2 msec 0Descale multiplier No conversion factor needed to convert trace data to millivolts in this case 54No. channels in this channel set 1Channel type code1 = Seis, 9 = Aux 0Not usedRequired to be 0 in SEG-D standard 0No. subscans exponent 2 0 = 1 means these traces have the base sample rate from GH 1 (2 msec) 0Channel gain control methodNot used (trace data needs no gain) 223Alias filter frequencyIn Hz 293Alias filter slopeIn dB/octave 0Low cut filter frequencyIn Hz 0Low cut filter slopeIn dB/octave. 0 means no low cut

10 SEG-D Channel Set Header ValueDescriptionNotes 0Notch frequency 1In Hz, 0 means no notch 0Notch frequency 2In Hz, 0 means no notch 0Notch frequency 3In Hz, 0 means no notch 0Extended channel set number 0Extended header flag Set to 1 if extended header has additional channel set information 3No. trace header extensions Undefined in SEG-D Revision 1, this was taken from Revision 2. 0Vertical stackShould be 1 indicating no stack. 1Cable/streamer no.Receiver point line for OptoPlan 1Array forming 1=no array forming, n=#groups summed

11 0002c60: 3901 0101 0001 0000 0003 0000 0000 0000 9............... 0002c70: 0000 0000 0000 0100 0001 0000 1388 0000................ SEG-D Demultiplexed Trace Header

12 ValueDescriptionNotes 3901File numberFFFF for numbers greater than 9999 1Scan type numberAlways 1 for these data 1Channel set number FF for numbers greater than 99 Ranges from 1 to 96 for these data 1Trace number Ranges from 1 to 3966 for these data 0Timing wordNot applicable for these data 3Trace header extensionsMust match channel set value 0Sample skewNot used 0Time break window0 for marine operations 0Extended channel set number Used when channel set above is set to FF 0Extended file number Used when file number above is set to FFF

13 0002c70: 0000 0000 0000 0100 0001 0000 1388 0000................ 0002c80: 0000 0000 0000 0000 071a 1100 0502 1503................ 0002c90: e900 0036 48f9 3f2c 4abf 371e 3fbe b852...6H.?,J.7.?..R SEG-D Trace Header Extension 1

14 Value DescriptionNotes 1Receiver line no.“Cable” 1Receiver point no.Position on “Cable” 0Receiver point indexNot used 5000 (1388 16 )Number of samples per trace 0Extended receiver line no.Not used (SEG-D Rev 2) 0Extended receiver point no.Not used (SEG-D Rev 2) 7Sensor type 1 = Hydrophone (pressure sensor) 6 = Accelerometer, Vertical 7 = Accelerometer, Horizontal, inline (SEG-D Rev 2) 8 = Accelerometer, Horizontal, cross-line

15 SEG-D Trace Header Extension 1 ValueDescriptionNotes 26 (1a 16 )Subrack addressInternal channel address 17 (11 16 )Board addressInternal channel address 0Board channelInternal channel address 5Booster amplifier 2Splitter output 21 (15 16 )ITU channel 1001(3e9 16 )Optical Cable Coded according to quadrant (ref. Map): SW – 0-999 NW – 1000-1999 NE – 2000-2999 SE – 3000-3999 54 (36 16 )Position on Optical CableRef. Map

16 0002c90: e900 0036 48f9 3f2c 4abf 371e 3fbe b852...6H.?,J.7.?..R 0002ca0: 0000 0000 0000 0000 0000 0000 4233 70a4............B3p. 0002cb0: 0000 0000 0000 0000 0000 0000 0000 0000................ SEG-D Trace Header Extension 2

17 ValueDescriptionNotes 510457.38Receiver point easting 6265743.0Receiver point northing 1.49Receiver point depth 0.0Receiver rotation XYDegrees 0.0Receiver rotation ZYDegrees 0.0Receiver rotation ZXDegrees 44.86Sensitivity of sensors Hydrophone: dB [rad/Pa] Accelerometers: dB [rad/g] 0.0Not used

18 3f4d6438 3f4c8105 3f4caf0f 3f4d4f1a 3f4f2e21 3f4de19b 3f4d08e2 3f4dfb8c … decoding to: 0.80231047 / 0.7988437 / 0.7995462 / 0.80198824 / 0.8092976 / 0.8042237 / 0.8009168 / 0.80461955 / … 0000 0000 0000 0000 0000 0000................ SEG-D Trace Data

19 INTEGER FUNCTION GET_UNSIGNED_CHAR(UNIT, READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT CHARACTER*1 C READ (UNIT,’A1’,ERR=99,END=99,IOSTAT=READSTAT)C GET_UNSIGNED_CHAR = ICHAR(C) IF(GET_UNSIGNED_CHAR.LT. 0) GET_UNSIGNED_CHAR = & GET_UNSIGNED_CHAR + 256 RETURN 99 CONTINUE GET_UNSIGNED_CHAR = -1 RETURN END

20 INTEGER FUNCTION GET_UNSIGNED_SHORT(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER IC(2) INTEGER GET_UNSIGNED_CHAR EXTERNAL GET_UNSIGNED_CHAR GET_UNSIGNED_SHORT = -1 IC(1) = GET_UNSIGNED_CHAR(UNIT,READSTAT) IF (IC(1).LT. 0) RETURN IC(2) = GET_UNSIGNED_CHAR(UNIT,READSTAT) IF (IC(2).LT. 0) RETURN GET_UNSIGNED_SHORT = IC(1)*256+IC(2) RETURN END

21 INTEGER FUNCTION GET_SIGNED_SHORT(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER IC INTEGER GET_UNSIGNED_SHORT EXTERNAL GET_UNSIGNED_SHORT IC = GET_UNSIGNED_SHORT(UNIT,READSTAT) C ASSUMES NEAR-UNIVERSAL TWOS-COMPLEMENT REPRESENTATION GET_SIGNED_SHORT = MOD(IC + 32768,65536) - 32768 RETURN END

22 INTEGER FUNCTION GET_UNSIGNED_INTEGER3(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER IC(2) INTEGER GET_UNSIGNED_CHAR, GET_UNSIGNED_SHORT EXTERNAL GET_UNSIGNED_CHAR, GET_UNSIGNED_SHORT GET_UNSIGNED_INTEGER3 = -1 IC(1) = GET_UNSIGNED_CHAR(UNIT,READSTAT) IF (IC(1).LT. 0) RETURN IC(2) = GET_UNSIGNED_SHORT(UNIT,READSTAT) IF (IC(2).LT. 0) RETURN GET_UNSIGNED_INTEGER3 = IC(1)*65536+IC(2) RETURN END

23 INTEGER FUNCTION GET_SIGNED_INTEGER3(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER IC INTEGER GET_UNSIGNED_INTEGER3 EXTERNAL GET_UNSIGNED_INTEGER3 IC = GET_UNSIGNED_INTEGER3(UNIT,READSTAT) GET_SIGNED_SHORT = MOD(IC + 8388608, 16777216) - 8388608 RETURN END

24 INTEGER*8 FUNCTION GET_UNSIGNED_INTEGER(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER IC(2) INTEGER GET_UNSIGNED_SHORT EXTERNAL GET_UNSIGNED_SHORT GET_UNSIGNED_INTEGER = -1 IC(1) = GET_UNSIGNED_SHORT(UNIT,READSTAT) IF (IC(1).LT. 0) RETURN IC(2) = GET_UNSIGNED_SHORT(UNIT,READSTAT) IF (IC(2).LT. 0) RETURN GET_UNSIGNED_INTEGER = IC(1)*65536+IC(2) RETURN END

25 INTEGER*8 FUNCTION GET_SIGNED_INTEGER(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER*8 IC INTEGER*8 GET_UNSIGNED_INTEGER EXTERNAL GET_UNSIGNED_INTEGER IC = GET_UNSIGNED_INTEGER(UNIT,READSTAT) GET_SIGNED_SHORT = MOD(IC+2147483648,4294967296)-2147483648 RETURN END

26 REAL FUNCTION GET_IEEE32(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER IC REAL RC EQUIVALENCE (IC,RC) INTEGER*8 GET_SIGNED_INTEGER EXTERNAL GET_SIGNED_INTEGER IC = INT(GET_SIGNED_INTEGER(UNIT,READSTAT)) GET_IEEE32 = RC RETURN END

27 DOUBLE PRECISION FUNCTION GET_IEEE64(UNIT,READSTAT) IMPLICIT NONE INTEGER UNIT, READSTAT INTEGER*8 IC DOUBLE PRECISION RC EQUIVALENCE (IC,RC) INTEGER*8 GET_SIGNED_INTEGER EXTERNAL GET_SIGNED_INTEGER IC = GET_SIGNED_INTEGER(UNIT,READSTAT)*4294967296 IC = IC + GET_SIGNED_INTEGER(UNIT,READSTAT) GET_IEEE64 = RC RETURN END

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