|
| | Abstract | | The Oki-daito ridge ODR is located in the West Philippine basin, and has complex characteristics to interpret its tectonic development. We investigated the crustal structure and geological history of ODR. We first applied a tomographic inversion to OBS Ocean Bottom Seismometer data, and used PSDM Pre Stack Depth Migration to image more clearly the discontinuity in the P-wave velocity structure. As a result of our processing, we obtained the following two results. First, crustal thickening has a peak at the top of the ridge. Second, there are apparent differences in the crustal thickness between the northeast side and the southwest side of the crust where the ODR makes the boundary. From the above, we conclude that the ODR is an ocean bottom ridge which was constructed by rifting at about 50 Ma B.P. |
|
|
|
| |
|