Table T1.

Table T1. Acquisition parameters of seismic reflection data used in selecting proposed drill sites on the Kerguelen Plateau and Broken Ridge.

Research vessel:

Cruise number: Rig Seismic

47 Marion Dufresne
47 Robert Conrad
2708 Rig Seismic

179 Rig Seismic

180 Marion Dufresne
109

Region: Kerguelen Plateau Kerguelen Plateau Broken Ridge Kerguelen Plateau Kerguelen Plateau Kerguelen Plateau

Year: 1985 1986 1986 1997 1997 1998

Designation: RS47 MD47 C2708 RS179 RS180 MD109

Navigation: Transit satellite Transit satellite Transit satellite Differential GPS Differential GPS GPS

Source: 2 air guns 1 Flexichoc 2 water guns 20 sleeve air guns 20 sleeve air guns 10 GI air guns

Volume: 1000 in³ NA 160 in³ 3000 in³ 3000 in³ 1050 in³

Shot interval: ~50 m ~50 m ~65 m ~50 m ~50 m ~50 m

Sample interval: 2 ms 4 ms 1 ms 2 ms 2 ms 4 ms

Record length: 7 s + delay 4 s 9 s 16 s 16 s 17 s

Streamer length: 1200 m 2400 m ? 3000 m 3000 m 2400 m

Number of groups: 48 48 1 240 240 96

Group interval: 25 m 50 m NA 12.5 m 12.5 m 25

Processing: Stack Stack NA F-x migration F-x migration F-k migration

Research vessel: Cruise number:	Rig Seismic 47	Marion Dufresne 47	Robert Conrad 2708	Rig Seismic 179	Rig Seismic 180	Marion Dufresne 109
Region:	Kerguelen Plateau	Kerguelen Plateau	Broken Ridge	Kerguelen Plateau	Kerguelen Plateau	Kerguelen Plateau
Year:	1985	1986	1986	1997	1997	1998
Designation:	RS47	MD47	C2708	RS179	RS180	MD109
Navigation:	Transit satellite	Transit satellite	Transit satellite	Differential GPS	Differential GPS	GPS
Source:	2 air guns	1 Flexichoc	2 water guns	20 sleeve air guns	20 sleeve air guns	10 GI air guns
Volume:	1000 in³	NA	160 in³	3000 in³	3000 in³	1050 in³
Shot interval:	~50 m	~50 m	~65 m	~50 m	~50 m	~50 m
Sample interval:	2 ms	4 ms	1 ms	2 ms	2 ms	4 ms
Record length:	7 s + delay	4 s	9 s	16 s	16 s	17 s
Streamer length:	1200 m	2400 m	?	3000 m	3000 m	2400 m
Number of groups:	48	48	1	240	240	96
Group interval:	25 m	50 m	NA	12.5 m	12.5 m	25
Processing:	Stack	Stack	NA	F-x migration	F-x migration	F-k migration

Notes: GPS = Global Positioning System, GI = Generator-Injector. NA = not applicable, ? = unknown. F-x = frequency-distance, F-k = frequency-wave number.