Table T1. Acquisition parameters of seismic reflection data used in selecting proposed drill sites on the Ontong Java Plateau.

Table T1. Acquisition parameters of seismic reflection data used in selecting proposed drill sites on the Ontong Java Plateau.

Hakuho Maru
KH98-1 Leg 2

Maurice Ewing
95-11

Thomas Washington
88-11

Year 1998 1995 1988

Designation KH98-1 EW95-11 TW88-11

Navigation GPS GPS GPS/Transit

Source 1-4 air guns 20 air guns 1 water gun

Volume 4.5 L/1000-3400 in³ 8510 L/in³ 80 L/in³

Shot interval (m) ~50 ~50 ~40

Sample interval (ms) 2 2 1

Record length (s) 8 and 16 16 3-9

Streamer length (m) 300 and 1200 3000 100

Number of groups 24 and 48 120 1

Group interval (m) 12.5 and 25 25 NA

Processing Migration Migration NA

	Hakuho Maru KH98-1 Leg 2	Maurice Ewing 95-11	Thomas Washington 88-11
Year	1998	1995	1988
Designation	KH98-1	EW95-11	TW88-11
Navigation	GPS	GPS	GPS/Transit
Source	1-4 air guns	20 air guns	1 water gun
Volume	4.5 L/1000-3400 in³	8510 L/in³	80 L/in³
Shot interval (m)	~50	~50	~40
Sample interval (ms)	2	2	1
Record length (s)	8 and 16	16	3-9
Streamer length (m)	300 and 1200	3000	100
Number of groups	24 and 48	120	1
Group interval (m)	12.5 and 25	25	NA
Processing	Migration	Migration	NA

Notes: GPS = Global Positioning System. Two values in columns indicate single-channel seismic/multichannel seismic. NA = not applicable.