This web page uses JavaScript.
JavaScript is invalid in the environment you are currently using, you can not display the page correctly.

If your web browser supports JavaScript, please enable it and set it.

OBS survey list

OBS探査一覧

OBS Cruise List

OBS(Ocean Bottom Seismograph)

One of aims of crustal structural expedition is to obtain P-wave velocity structures underneath the ocean bottom. Seismic data used here are deep penetrating refraction and wide-angle reflection waves generated by a large airgun array system.Ocean Bottom Seismographs (OBS) are settled on the sea bottom and positioned by using a real time super short base line (SSBL) acoustic positioning system with accuracy of 1-3% of water depth. Since we have required a high resolution seismic image, a super-densely deployed OBS array with spacing of a few to 10 km is preferred. These seismic methods using OBS can be used for understanding of deeper structure.

OBS survey list