Table T1. Seismic layers and iso-velocity depths at Site IBM-3C.
Seismic
layer |
Age
(Ma) |
Two-way traveltime
(s) |
Assumed sonic velocity (km/s)
|
Depth
(mbsf) |
Thickness
(m) |
Description
|
Iso-velocity pick from OBS
(km/s) |
Depth
(mbsf) |
|---|---|---|---|---|---|---|---|---|
| L1 | 0−1 | 2.83−2.87 | 1.59 | 0−32 | 32 | Silicic volcaniclastic channel deposits from Myojin Knoll | ||
| L2 | 1−3 | 2.87−3.17 | 1.85 | 32−309 | 277 | Biomodal volcaniclastics from the back-arc extensional zone to the east | ||
| L3 | 3−6.5 | 3.17−3.58 | 2.28 | 309−777 | 467 | Manji and Enpo rear-arc volcaniclastic record | ||
| L4 | 6.5−9 | 3.58−3.90 | 2.62 | 777−1196 | 419 | Same as Layer L3, but more faulted? | ||
| L5 | 25−35 | 3.90−5.41 | 4.26 | 1196−4412 | 3216 | Oligocene to Eocene arc volcaniclastics (and lavas?) | 3.0 | 1400 |
| 4.0 | 1700 | |||||||
| 5.0 | 2100 | |||||||
| Crystalline basement? | ||||||||
| 6.0 | 4900 |
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