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タイトル: Heat Flow in Central Japan and its Relations to Geological and Geophysical Features
その他のタイトル: 中部日本の地殻熱流量及び他の観測データとの相関性
著者: Li, Xinyuan
Furukawa, Yoshitsugu
Nagao, Toshiyasu
Uyeda, Seiya
Suzuki, Hiroyoshi
著者(別言語): 李, 新元
古川, 善紹
長尾, 年恭
上田, 誠也
鈴木, 宏芳
発行日: 1989年6月30日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第64冊第1号, 1989.6.30, pp. 1-36
抄録: An investigation on the distribution of surface heat flow in central Japan was carried out using bore-holes of the Kanto-Tokai seismic network of the National Research Center for Disaster Prevention, and holes drilled for geological survey by the Water Resources Development Public Cooperation, the Kanto Regional Construction Bureau and the Chubu Regional Construction Bureau. Topographic effects on heat flow values measured in areas of high topographic variation were taken into account. Eighteen new heat flow values were obtained and three additional data were provided by NEDO (the New Energy Development Organization). On the basis of the new data combined with previous data, a heat flow contour map of the area was prepared, delineating a very broad zone of low heat flow through the central to eastern part of the Kanto district and a low heat flow zone in the western part of the Tokai district. Heat flow increases up to over 100mw/m2 towards the volcanic front. The low heat flow in these two areas can be interpreted as the cooling effect of subduction of the Pacific Plate and the Philippine Sea Plate. The temperature at the Moho discontinuity and mantle heat flow were estimated by a one-dimensional steady-state conductive model with two layers of granitic and basaltic composition. Mantle heat flow demonstrated a similar distribution to that of the surface heat flow. A comparision was made between the features of the distribution of surface heat flow and those of variations of certain other geophysical characteristics. It was found that the surface heat flow correlates fairly well with the Curie isotherm, the attenuation structure in the layer of 30-60 km depth (HASHIDA, 1987), and seismicity at depths of 40-60 km.
URI: http://hdl.handle.net/2261/13026
ISSN: 00408972


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