Cruise report entry scripts Knudsen cruise report entry Plot of some Knudsen chirp data. Plot of MCS shot 5000. Plot of MCS shot 5000 with 6x250 filter. Plot of spectrum of MCS shot 5000. Plot of dimples (chirp). Plot of dimples (mcs brute stack). Plot of dimples (fkmigr brute stack). Steps: 1) mount /Volumes/192.168.10.86/LINENO # Bergen/Geometrics segy files mount /Volumes/192.168.10.86-1 # Bergen/Geometrics log files (all lines) cd /Users/seismic/Data/MCS/Raw/shots mkcpy-shots XX Creates /Users/seismic/Data/MCS/Raw/shots/Healy05$LINE Reads the last SEGY file on /Volumes/192.168.10.86 Writes all shots to /Users/seismic/Data/MCS/Raw/shots/Healy05$LINE/$FILE (This is the Coakley/Hopper archival data, which is in IEEE whereas the Geometrics file is IBM) Writes "latest_shot" to /Users/seismic/Data/MCS/Raw/latest_shot. Tries to get the log file and chmod 444 the segy files. 2) Make sure /Users/seismic/Data/MCS/Raw/shots/Healy05XX has a log file for each sgy file. (Control-c in step 1 (mkcpy-shots) prevents the script from finishing and doing the log copy). If the logs are not proper, get them! e.g. cp -p /Volumes/192.168.10.86-1/HEALY05XX*.log chmod 444 *.log # mkdir /Users/seismic/Data/Nav/Healy05XX # cat H*.log > /Users/seismic/Data/Nav/Healy05XX/geometrics.log Run script clean_logs to remove all the '#BV' lines that are confusing sioseis. Get the first and last shots times from file geometrics.log 4) Get the Seabeam or Knudsen file as: If the ship's data disk needs to be mounted, mount it as: mkdir /Volumes/Raw-data mount 192.168.10.17:/Data /Volumes/Raw-data SeaBeam cd /Users/seismic/Data/Seabeam ls -lt /Volumes/Raw-data/Datalog/seabeam_centerbeam | head cp the appropriate seabeam file, e.g. cp -p /Volumes/Raw-data/Datalog/seabeam_centerbeam/Seabeam-Centerbeam_20050902-000004.RAW . cat the appropriate file to > lineXX.raw or ln -s Seabeam-Centerbeam_20050820-000003.RAW lineXX.raw Knudsen cd /Users/seismic/Data/Knudsen-depth ls -lt /Volumes/Raw-data/Datalog/knudsen | head cp the appropriate Knudsen file, e.g. cp -p /Volumes/Raw-data/Datalog/knudsen/Knudsen_20050913-000004.RAW . ln -s /Users/seismic/Data/Knudsen-depth/Knudsen_20050913-000004.RAW line46.raw 5) cd /Users/seismic/Data/MCS/Processed/Shots+nav mkshnav.sio XX > lineXX.stdout (This writes file Healy05$LINENO.segy which has the UDP long/lat and the Seabeam center depth in the SEG-Y trace header). 6) cd /Users/seismic/Data/MCS/Processed/Shots+FK The Bergen PCs were put on NTP during week 1, so the SEG-Y shot time is the best time of the trigger (presumably the trigger is on one of these PCs). The posmv navigation were transmitted from computer Healy-mx via "udp". The Posmv is ~38m from the fantail (Consolidated survey: Posmv=-49.57, aft fantail survey = -86.74, eyeball survey pt to end of fantail = -.8m) Eyeball fantail to guns = 5m. guns to trace 1 = 90m. Therefore, distance from nav to first bin center = 38+5+45 = 88m The seismic shot number (trigger counter) and the navigation were added to the Geometrics log for each shot, along with the normal Geometrics information. E.G. 51920,084423.968,8018.32612,N,17425.62968,W,1,09 - Received at 08:45:25.57 for File 33262 FFID 33262 (Stack 1, Shot Loc: 0 Meters) 08:45:25.47 08/22/2005 1546 KBytes SAVED IN 33262.SGY 51921,084443.967,8018.34381,N,17425.70720,W,1,09 - Received at 08:45:45.59 for File 33263 FFID 33263 (Stack 1, Shot Loc: 0 Meters) 08:45:45.49 08/22/2005 1542 KBytes SAVED IN 33262.SGY 51920 is the shot number. 084423.968 is the fix time. 08 hours, 44 minutes, 23.968 seconds. FFID is the count of the files written by the Geometrics lsd of raw shot says: SHOT TR RP TR ID RANGE DELAY NSAMPS SI YR DAY HR MIN SEC 33262 1 0 0 1 0 0 16000 1000 5 234 8 45 25 33263 1 0 0 1 0 0 16000 1000 5 234 8 45 45 lsd after healy nav: SHOT TR RP TR ID RANGE DELAY NSAMPS SI YR DAY HR MIN SEC 51920 1 8300 0 1 -90 0 16000 1000 5 234 8 45 25 51921 1 8307 0 1 -90 0 16000 1000 5 234 8 45 45 NOISE: 0) Low frequency (10Hz.) streamer noise due to heave or ship surges. Notice how successive streamer sections (8 traces) have reduced noise between traces 8/8 and 16/17. FK filter is very effective at reducing them. 1) "Spikes". Largish amplidutes (3x normal trace a few sec after water bottom). FK Filter sweeps or bleeds them into adjacent traces. Hand editing. FK bleeding problem? 2) Traces and shots without seismic signals. Short/long window based around the Seabeam water depth, with a ratio of .5, kills them. 3) Traces go noisy after the water bottom. SIOSEIS modifications for Healy05: 1) REALTIME flag set in the PROCS list by the user. 2) DISKIN looks at REALTIME flag and save the disk address of each trace read. When end-of-file is detected, the segy file is closed and sioseis sleeps for a few seconds and the the file is reopened and positioned to the save disk address and the trace read is tried again. The program decides shooting ahs stopped after no shots are read after 120 seconds. The file must be closed and reopened so that the OS resets the inode information for the file. 3) GEOM module HEALY05 was added to read the Geometrics Log file with Bergen/LDEO nav and centerbeam info added. The Geometrics log file contains other stuff. It may also miss shots, especially at the start or end of line. The centerbeam is in a different file. The water depth from the first Seabeam entry for the same minute is used. The Seabeam depth may be missing so the last good one is used (might be hours old!). The Geometrics FFID is put into SEGY word 5 (energy source number) and the Bergen trigger counter is used as the shot number and put into SEGY word 3. The nav and water depth are put into the SEGY trace header as per SEG standards. 4) GEOM type 9 (realtime dfls (distance from last shot) ) was wrong on the shot after a missing shot. (BUG). 5) The maximum number of semblance velocities in VELAN was increased. 6) PLOT rejected shots numbered 0 (a Knudsen quirk). 7) Parameter ENDMUTE was added to despike/tredit to partially kill bad traces. 8) Stack was "rewritten" to not count samples with zeroes. (New parameter NEW). 9) SIOPLT doesn't work on 24bit displays (1,66.,... colors). Works on 8 bit displays (256 colors) only. 10) Allow 32K ffts for large Knudsen files 11) Modify Healy05 to use Knudsen depth files because SeaBeam died.Back to SIOSEIS Examples. Go to the list of seismic processes. Go to SIOSEIS introduction.