Seismic Velocity Map (image) Kyushu University Share Print E-Mail Caption Researchers at Kyushu University have located a large gas reservoir below an axis of rifting based on an automated method for deriving seismic pressure wave velocity from seismic reflection data. The reservoir can be seen in this two-dimensional seismic velocity mapping, which spans a depth of about 3.5 km below sea level and a distance of about 6.5 km, as a dark-blue area of low velocity within green areas of higher velocity. Identification of the reservoir was possible because of the greatly enhanced resolution provided by the automated technique compared to the manual analysis methods used to date. Depending on the nature of the gas, which is likely mainly carbon dioxide, methane, or a mixture of the two, this reservoir found in the Okinawa Trough could be a potential natural resource or an environmental concern. Credit Takeshi Tsuji, Kyushu University Usage Restrictions Only for media and non-commercial use. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.