PAT sites were surveyed for ODP Leg 199, along nominally a 40 Ma and 56 Ma crustal transect. The S1013 and S1014 data were recorded when the ship's track crossed the positions of ODP Site 1013 and 1014, in the California Borderlands. 

The 3.5 kHz subbottom profiler was recorded on a Geometrics Series R seismograph, 64 microsecond sample rate. The processing is discussed in more detail in Janik et al. (2004) JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 109, B07101, doi:10.1029/2003JB002439, 2004


Space = secs from the start of JD346--approx seconds since cruise started
JD = julian day


To produce the processed product that appears on the postscript and gif 
images, the following steps were taken in promax:
1) Disk Data Input
2) Bandpass Filter - Zero Phase Ormsby - 1000-2000-4000-6000 Hz
  (removes ship/streamer noise)
3) Trace Math Transforms - ABS Samples
  (Absolute value of the samples to remove polarity shifts)
4) Trace Math Transforms - Base 10 Log 
  (Distribute the amplitudes)
5) Trace Math - Subtract 2.0
  (Subtract for a nice color distribution)
6) True Amplitude Recovery - 20.0 dB/sec correction constant
  (Boost up lost signal with increasing depth)
7) Stack Display - Full Color