Processing Workflow
The processing workflow describe below was applied to tapes 20 and 21.
Pre-processing
Fig. \ref{803964} shows the pre-processing sequence applied. After reading the data (DSIN) we applied a low pass filter (FILTER) with corner frequencies of 0 and 8 Hz, then we muted the direct wave arrival (MUTE) and applied the noise suppression module AMPSCAL to scale down the noise burst. The window used was 200ms with a factor of 2; anything higher than that would remove useful reflection data. Traces that were still noisy were mute using the interactive module IEDIT. Finally the data was written down.