Data collection during the cruise in Santa Monica Basin focused on the proximal region
of Hueneme submarine fan. Trackline grid spacings were 0.5-3 km over the upper and
middle fan areas (see Normark et al., 1998). For conventional seismic-reflection
profiling, a Texas Instruments 40 in3 (650 cm3) sleeve gun was fired every 3
sec at 1300 psi. Signals were recorded using a Seismic Engineering (SE) 30-m
hydrophone array. The 30-m SE100 streamer provided good data typically to depths
of 1.2 sec with reflector resolution of about 50 ms roundtrip travel time
(approx 35 m). In addition, a higher frequency record was produced using a
Nova Scotia Research Foundation (NSRF) Mark 5a 6-m hydrophone array. The shorter
NSRF array obtained useful data to about 0.4 sec but with a higher frequency
bandwidth that provided resolution of about 30 ms (approx 20 m). Nominal resolution
of the sleeve gun is 5 m.
This cruise marked the first time that all of the seismic-reflection data obtained with the SE100 and NSRF
streamers was digitally recorded.
Positioning for the survey was based on GPS data and tracklines are accurate to +-30 m.
