2024-03-28T10:29:39Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00032872
2022-12-19T05:17:28Z
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琉球弧北部及び中部における地殻熱流量測定 : 1984年SONNE号航海による観測
Heat Flow Measurements in the Northern and Middle Ryukyu Arc Area on R/V SONNE in 1984
山野, 誠
128166
上田, 誠也
128167
古川, 善紹
128168
453
application/pdf
Multiple penetration heat flow measurements were made using Ewing type and violin bow type instruments on the cruise of R/V SONNE in 1984. The studied areas are the Ryukyu Trench between the Kyushu-Palau Ridge and the Amami Plateau, the northernmost part of the Okinawa Trough, and the middle Okinawa Trough around 127°E. In the Ryukyu Trench area, the heat flow is 50 to 65 mW/m2 near the trench axis and it seems to be lower on the landward wall. The heat flow could not be determined in the northern Okinawa Trough, because the temperature profiles were very non-linear probably due to variations in the bottom water temperature. In the middle Okinawa Trough, extremely high heat flow values were observed in a depression called the Natsushima-84 Deep located in the central rift region. Combined with the results of the DELP-84 WAKASHIO cruise, the average of heat flow in the depression is about 500±400 mW/m2. The very high and variable heat flow, as well as non-linear temperature profiles, suggest the existence of hydrothermal activity. North and south of the Natsushima-84 Deep the obtained heat flow values were not so anomalous.
departmental bulletin paper
東京大学地震研究所
1986-12-10
application/pdf
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
2
61
311
327
AN00162258
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/32872/files/ji0612006.pdf
eng