Table T3. Quality control characteristics and sonic log data, Hole C0002A. (See table notes.)
| Depth interval (m LSF) |
Zone | Quality | Comments | |
|---|---|---|---|---|
| Top | Bottom | |||
| –6 | 107 | 2 | 0 | Difficult to distinguish from mud arrival. |
| 107 | 634 | 2 | 2 | Fairly intermittent arrivals with zones of clear arrivals and zones hard to pick on MP wide. While in general worse, there are patches where MP widefast (pulling out) returns improved signal over MP wide (e.g., 327–347 m LSF). Leaky-P gives a more continuous, but less trustworthy coherence. Separation from mud arrival improves with depth. Note: processing parameter change at 546 m LSF but no obvious change in coherence. |
| 634 | 760 | 1 | 1 | Fairly strong arrivals on MP wide clearly distinguished from mud velocity. |
| 760 | 813 | 1 | 2 | Intermittent arrivals with some gaps in MP wide. 2 m scale oscillation in values that may be noise related. |
| 813 | 934 | 1 | 1 | Excellent arrivals; significant jumps appear to be trustworthy. |
| 934 | 978 | 1 | 3 | Very few reliable looking coherency patches. Base is location of parameter change from “very slow” to “slow” parameters. |
| 978 | 1075 | 1 | 2 | Reliable patches with small gaps that are unpickable in between. |
| 1075 | 1099 | 1 | 3 | Large unpickable gap. |
| 1099 | 1118 | 1 | 2 | Pickable section. |
| 1118 | 1150 | 1 | 3 | Unpickable. |
| 1150 | 1165 | 1 | 2 | Pickable but not as clear as some of the patches. |
| 1165 | 1191 | 1 | 3 | Unpickable. |
| 1191 | 1282 | 1 | 2 | Pickable with some clear patches and some mediocre patches. |
| 1282 | 1293 | 1 | 3 | Unpickable. |
| 1293 | 1391 | 1 | 2 | Mix of pickable coherent packages and small unpickable gaps. |
Notes: LSF = LWD depth below seafloor, MP = mixed processing. See “Data and log quality.”
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