Four work stations were set up in the laboratory for preliminary analysis of the data. Aside from this seismic reflection survey, a refraction survey using ocean bottom seismometers was also done. Even though the streamer is 6 km long, it is not easy to detect the seismic velocity structure, especially around the upper limit of the seismogenic zone, or where inter-plate seismicity starts, so we installed the ocean bottom seismometers to determine the seismic structure in detail. Gun boom equipped in the stern of Ewing. Air guns are towed by the wires from the boom.
Staff can check the situation of the survey using monitors.
The results as of present and the theme for future By using the above mentioned technology, the reflective section processed on the vessel can be seen in high resolution to its details. These are lying on top of others to form a large slope in the sea bottom. However, the preliminary analysis done onboard the vessel was not all correct. The results obtained from this analysis, regarding the streamer as a straight line, was not accurate. The 3-D analysis is a very appropriate method to rectify this inaccuracy.