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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第72号 >
有珠火山2000年新山からの総放熱率
| Title: | 有珠火山2000年新山からの総放熱率 |
| Other Titles: | Quantitative evaluation of heat discharge rates from the geothermal area formed during the 2000 eruption of Usu volcano, Japan |
| Authors: | 寺田, 暁彦1 Browse this author | | 鍵山, 恒臣2 Browse this author | | 松島, 喜雄3 Browse this author | | 吉川, 慎4 Browse this author | | 吉川, 章文5 Browse this author | | 小山, 寛6 Browse this author | | 山﨑, 伸行7 Browse this author | | 平松, 秀行8 Browse this author | | 大島, 弘光9 Browse this author |
| Authors(alt): | Terada, Akihiko1 | | Kagiyama, Tsuneomi2 | | Matsushima, Nobuo3 | | Yoshikawa, Shin4 | | Yoshikawa, Akihumi5 | | Koyama, Hiroshi6 | | Yamazaki, Nobuyuki7 | | Hiramatsu, Hideyuki8 | | Oshima, Hiromitsu9 |
| Issue Date: | 15-Mar-2009 |
| Publisher: | 北海道大学大学院理学研究院自然史科学部門（地球物理学） |
| Journal Title: | 北海道大学地球物理学研究報告 |
| Journal Title(alt): | Geophysical bulletin of Hokkaido University |
| Volume: | 72 |
| Start Page: | 139 |
| End Page: | 157 |
| Abstract: | We estimate heat-discharge rates for a geothermal area formed during the 2000 eruption of Usu volcano, Japan. Field observations carried out in September 2006 reveal that heat-discharge rates from fumaroles, areas of steaming grounds and crater lakes are 8, 9.2, and 2 MW, respectively. The total heat-discharge rate measured in September 2006 represents just 1% of the rate immediately following the eruption. Integration of the heat-discharge rate from April 2000 to September 2006 yields an accumulated discharge of approximately 2.3 × 10^[16]J, equating to the cooling of 8 × 10^6 m^3 of magma. This amount of magma corresponds to several percent of the total intruded magma volume estimated from analyses of ground deformation associated with the 2000 eruption. Compared with the 1977 eruption, the 2000 eruption involved the discharge of large amounts of heat from fumaroles. Fumaroles that developed during the 2000 eruption showed a decline in activity in short time. Areas of steaming ground associated with the 2000 eruption showed more rapid growth compared with those of the 1977 eruption but discharged less heat. We suspect that differences in the hydrological environments of the two eruptions (e.g., permeability around the intruded magmas) led to contrasting patterns of propagation of the hydrothermal systems around the intruded magmas. |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/38150 |
| Appears in Collections: | 北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第72号
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