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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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携帯型赤外カメラを用いた航空機による地表面温度測定(2006) -有珠火山・登別火山・樽前火山-

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/gbhu.75.43

Title: 携帯型赤外カメラを用いた航空機による地表面温度測定(2006) -有珠火山・登別火山・樽前火山-
Other Titles: Airborne survey of active volcano using portable infrared thermal camera( 2006) - Usu, Noboribetsu and Tarumai volcano -
Authors: 松島, 喜雄1 Browse this author
大島, 弘光2 Browse this author
森, 済3 Browse this author
前川, 徳光4 Browse this author
鈴木, 敦生5 Browse this author
寺田, 暁彦6 Browse this author
鍵山, 恒臣7 Browse this author
Authors(alt): Matsushima, Nobuo1
Oshima, Hiromitsu2
Mori, Hitoshi3
Maekawa, Tokumitsu4
Suzuki, Atsuo5
Terda, Akihiko6
Kagiyama, Tsuneomi7
Issue Date: 19-Mar-2012
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: 75
Start Page: 43
End Page: 58
Abstract: As a part of the joint geophysical and geochemical observations of Usu volcano in 2006, the airborne infrared thermal survey was conducted at Usu volcano, Noboribetsu geothermal area and Tarumai volcano. The observation was operated by the helicopter which has a hole on the floor for aerial photo of vertical direction. The portable infrared thermal camera (AVIO TVS-620) was fixed on the hole to face the ground perpendicularly using the stand designed for this survey. The position and horizontal direction of the camera were measured by GPS. The vertical angle of the camera was determined by two crossing electronic clinometers placed on the stand. The thermal images (one second interval) ware transferred directly from the camera to computer through the USB cable. The number of the pixel of each frame is 320 for horizontal direction and 236 for vertical direction. The instant view of one pixel is 1.4 mrad. The altitude of the flight was 2300m so that the temperature at a pixel represents the mean temperature of about 3 m2 and the each frame corresponds to the area of 1030 m × 730 m. The detective wavelength of the camera is 8 -14 ìm and the signal attenuation by the atmosphere was ignored in the analysis of the surface temperature. The helicopter kept the constant height during the measurement. The thermally active area was covered by 6, 2 and 3 measurement lines in Usu, Noboribetsu and Tarumai, respectively. The selected thermal images with suitable condition were combined (about 90 frames in Usu volcano) considering the horizontal orientation, vertical angle and the position. The resultant image represents the overall surface temperature distribution at respective field. The surface temperature distribution of Usu volcano shows that the thermally active area is mainly composed from four parts: Nishi-yama crater, Kompira-yama crater, summit area and Showa-shinzan. Nishiyama and Kompira-yama craters were newly formed craters at 2000 eruption activity. The surface temperature distribution of Noboribetsu shows the fumarole activity at Ohyu-numa and Jigoku-dani thermal area and that of Tarumai shows the fumarole activity at A and B craters, respectively. The detailed thermal structure at respective field is cleared by this observation. It is confirmed that this convenient observation system is satisfied for the practical use.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/49055
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第75号

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