海底カルデラにおける熱流量測定 : 序報

概要

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Measurements of the submarine heat flow at the Aira, Ata and Kikai calderas, southern Kyushu, Japan were conducted by using the disk-type submarine heat flow transducer. Corrections have been applied to variations in bottom water temperature, sedimentation, thermal refraction by the sediment prism and topography. Data at the Aira caldera show that the heat flow values are several HFU (10^<-6> cal/cm^2 sec) and locally higher than 100 HFU. These high heat flow values were observed at the deepest part of the caldera. Later, at this area, submarine fumarolic activities were found by the submerging survey. Based on the heat flow measurements, the total heat discharge from the submarine geothermal area was estimated to be 7xl0^6 cal/sec, assuming that the ratio of heat transfer from fumaroles to that by conduction is almost the same as that in the active fumarolic areas on land. Uncorrected heat flow values in the Ata and Kikai calderas are very high. However, as the corrections for variations in bottom water temperature are relatively Jarge in these calderas, we cannot conclude at present whether in every caldera the heat flow shows the value of several to higher than 100 HFU.
特定非営利活動法人日本火山学会の論文
1980-07-01