Shipboard Geophysical Group - Scripps Institution of Oceanography

Sound Source Equipment

· SSI GI Guns - This remarkable gun features two chambers, which may be fired independently of one another. With an appropriate delay, a single GI Gun can produce a pulse to bubble ratio much higher than a single chamber gun, or even a six gun array. The gun can be configured for 90, 150, or 210 cubic inches. SGG now has two GI Guns; they may be used together or singly.

· Bolt 1500LL airguns - These guns are the largest and most powerful SGG offers. Available chamber sizes range from 80 to 825 cubic inches. Typical uses include a 1925 cubic inch array, for firing at 20 second intervals on two 200 scfm compressors for deep reflection profiling; and a maximum 4450 cubic inch array, for firing at 90+ second intervals on a single 200 scfm compressor for shooting to ocean bottom seismographs (OBS's). Six guns in all.

· Bolt 1900CT airguns - An intermediate size gun, available in a four gun, 538 cubic inch array. May be fired at 10 second intervals on a single compressor.

· SSI T80 waterguns - Three of these 80 cubic inch waterguns are in inventory.

For controlling the guns and other seismic events, SGG recently acquired a Real Time Microsystems, Inc., SureShot Seismic Source Controller. This is a synchronizing system that will handle up to eight single chamber guns or four GI Guns.

“Have Guns - Will Travel”

- Last updated 5 November 1999 –