Expedition Menu
1. Introduction
The Question
3. Funding
4. Study Area
5. Background
Seismogenic Zone
7. Chief Scientists
8. The Journey
9. Ship Tour
10. Leaving Port
11. Seismic Method
12. Seismic Source
13. Seismic Recording
14. 3-D Acquisition
15. Life at Sea
16. In the Lab
17. Time to Depart
18. Data Processing
19. The 3-D Volume
20. Interpretation
21. Your Turn
22. Comparison
23, Publication
24. IODP Drilling

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This material is based
upon work supported
by the
National Science Foundation
Grant No. 0633234


NanTroSEIZE in 3-D

Imaging an Active Plate Boundary Fault
21. Your Turn at Interpretation

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Horizontal Scale

Along-Track Seismic Profile from 3-D Cube

First, note the horizantal and vertical scales, showing the dimensions of the seismic profile, and the orientations: NW - northwest (landward), SE - southeast (seaward)
download this digital image as a pdf to use a drawing program for making your interpretation.
Color and label the features listed below

  • Trench sediments (color in light yellow)

  • Shikoku Basin sediments carried into trench on the subducting oceanic crust (color light orange).

  • Frontal thrust zone, which is the most eastward (oceanward) seriies of thrusts, towards basinward direction. These are presumably the youngest thrusts, but not the only active thrust faults in the prism.
  • The series of individual thrusts of the imbricate thrust zone, composed of the offscraped sediments of the accretionary prism, and extending eastward to the frontal thrust
  • Slope sediments resting on top of the offscraped sediments of the accretionary prism (color light yellowish-green).
  • Kumano forearc basin sediments (color light green)
  • Top of the subducting oceanic crust (color light blue).
  • Fault offseting top of the subducting oceanic crust.
  • Subducting sediments of Shikoku Basin sediments (continue color light orange).
  • Decollement (active)
  • Older, now inactive decollement.
  • Mega-splay fault, separating the young portion of accretionary prism from older accretionary prism, located under the sediment of the Kumano forearc basin.

©Copyright 2009
July 23, 2009

Send to Don Reed

Department of Geology
San Jose State University
NanTroSEIZE Drilling Objectives
Modified from IODP Nankai Trough Seismogenic Zone Experiment

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