Table 1. Details on the compiled aeromagnetic surveys
| Flight index | 97KT | 97SW |
|---|
| Area | Around Kuti-no-Erabu Sima | Around Suwanose Sima |
|---|
| Period | Feb.3-Feb.4,1997 | Feb.7,1997 |
|---|
| Aircraft | YS-11 | YS-11 |
|---|
| Flight altitude | 2,700feet, 7,500feet | 9,500feet |
|---|
| Magnetometer | M-123 | M-123 |
|---|
| Positioning | GPS/OMEGA | GPS/OMEGA |
|---|
| Track lines | 1 naut. mile in E-W(2,700feet) | 1 naut. mile in E-W |
|---|
| 0.5 naut. mile in N-S(7,500feet) | 0.5 naut. mile in N-S |
|---|
| Anomaly map | Fig.1(2,700feet), Fig.2(7,500feet) | Fig.3 |
|---|
| Scale of original map | 1/50,000 | 1/50,000 |
|---|
| Map projection | TM | TM |
|---|
| Reference Magnetic | Kanoya | Kanoya |
|---|
| Observatory | (31 25.2 N, 130 52.9 E) |
(31 25.2 N, 130 52.9 E) |
|---|
| Core field model | IGRF1995 | IGRF1995 |
|---|
| Contour interval | 25nT(2,700feet), 10nT(7,500feet) | 10nT |
|---|
| Epoch year | 1997.1 | 1997.1 |
|---|