When you use a mono-channel (MC) streamer (composed by an array of hydrophones),
the acquisition geometry in boomer surveys is foundamental in shallow water (depth
minus MC lenght)! After several tests I found that if you use a the MC streamer
in transverse mode (source and MC parallel) you can keep the MC advantages (increment
signal/noise). In fact the conventional inline longitudinal deployment of source
and MC streamer leads to a strong phase difference along the hydrophone array
for nonvertical arrivals and the summed output is attenuated as a result. In
transverse configuration, the variation in phase along the array is smaller. The
summed output improves because pairs of hydrophones with equivalent absolute
offset are stacked in phase as a result of the symmetric configuration.
Details in:
Baradello L., Carcione J.M
Optimal seismic-data acquisition in very shallow waters: Surveys
in the Venice lagoondoi: 10.1190/1.2976117 Geophysics,November-December 2008 v. 73 no. 6 p. Q59-Q63
Note: All these seismic data collected and
processed by luca
baradello in OGS