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23. Air Gun-ocean Bottom Seismograph Seismic Structure across the Japan
| Content Provider | Semantic Scholar |
|---|---|
| Author | Suyehiro, Kiyoshi Kanazawa, Toshihiko Shimamura, Hideki |
| Copyright Year | 2006 |
| Abstract | A number of controlled-source seismic refraction studies using an ocean bottom seismograph (OBS) array have been made in the Japan Trench area recently. This report focuses on results from air-gun data of two experiments. The first carried out in 1981, had a 250 km-long profile along the 3000-m depth contour on the landward side of the trench. The second experiment, conducted in 1982, had a 300-km-long profile along the inner lower trench slope and also included two profiles perpendicular to the trench axis. General features previously discovered were more firmly established by the nature of bottom measurements and the close spacing of the shots. Continental-type upper crust exists as near as 40 km landward of the trench, and a thick sedimentary, low-velocity prism underlies the inner lower trench slope. The depths of the subducting Moho boundary are a few kilometers shallower than previously thought and dip more gently from beneath the trench axis to the continental slope break. It is difficult to substantiate Layer 2 subduction because of its thickness and probable gradual transition to Layer 3. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://deepseadrilling.org/87/volume/dsdp87_23.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
