ODP Leg 208: Early Cenozoic Extreme Climates: the Walvis Ridge Transect

Figure 5

Quality control and depth match of the Triple Combo (data in red) and FMS-sonic toolstrings (data in blue) at Hole 1263A. Triple Combo: (a) Caliper, (b) normalized vertical tool acceleration (NAz) and (c) Wavelet depth-scale representation of NAz between 130 and 280 mbsf. The analyzed record (133-277 mbsf) is characterized by acceleration/deceleration mainly over a range < 1 m. Major washouts are characterized by localized stick-slip displacement over intervals of intermediate scale (~ 4-7 m). The high frequency component could be explained by incomplete heave compensation, the other components are related to hole condition (size of the washout). The comparison of the wavelet representation and hole shape shows that the intervals where tool acceleration changes correspond to changes in hole diameter. FMS-sonic: (d) Calipers, (e) normalized vertical acceleration (NAz). As for the Triple combo, acceleration of the FMS-sonic toolstring remained at low levels. Close-up of interval 110 and 150 mbsf: (f) FMS-sonic caliper and (g) computed gamma ray (CGR) logs from Hole 1263A. No unambiguous depth match between the runs could be found. Therefore, the same shift to seafloor was applied to the FMS-sonic logs. Note the discrepancy between the Triple Combo and the FMS caliper data.