Table 1 Parameters for reflection survey.
From: Seismic reflection survey of the crustal structure beneath Unzen volcano, Kyushu, Japan
Line | 12 km | |
Source | Vibrator Y-2400 | |
|  | Sweep frequency | 8–50 Hz |
| Â | Sweep length | 15 s |
| Â | Sweeps per point | 34 (5 for shallow survey) |
| Â | VP interval | 50 m (avr.) |
| Â | Total points | 201 (80 for shallow survey) |
Receiver | Â | |
| Â | Geophone | 10 Hz vertical |
| Â | Phones/site | 9 |
| Â | Interval | 25 m |
| Â | Total point | 589 |
Recording | GDAPS-4 | Â |
| Â | Sampling | 4 ms |
| Â | Channels | 580 |
| Â | Record length | 16 s (after correlation) |
CMP interval | 12.5 m | |