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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As a part of the joint geophysical and geochemical observations of Usu volcano in 2006, theairborne infrared thermal survey was conducted at Usu volcano, Noboribetsu geothermal area andTarumai volcano. The observation was operated by the helicopter which has a hole on the floorfor aerial photo of vertical direction. The portable infrared thermal camera (AVIO TVS-620) wasfixed on the hole to face the ground perpendicularly using the stand designed for this survey. Theposition 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 thermalimages (one second interval) ware transferred directly from the camera to computer through theUSB cable. The number of the pixel of each frame is 320 for horizontal direction and 236 forvertical direction. The instant view of one pixel is 1.4 mrad. The altitude of the flight was 2300mso that the temperature at a pixel represents the mean temperature of about 3 m2 and the eachframe 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 surfacetemperature. The helicopter kept the constant height during the measurement. The thermally activearea 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 Usuvolcano) considering the horizontal orientation, vertical angle and the position. The resultantimage represents the overall surface temperature distribution at respective field. The surfacetemperature distribution of Usu volcano shows that the thermally active area is mainly composedfrom four parts: Nishi-yama crater, Kompira-yama crater, summit area and Showa-shinzan. Nishiyamaand Kompira-yama craters were newly formed craters at 2000 eruption activity. The surfacetemperature distribution of Noboribetsu shows the fumarole activity at Ohyu-numa and Jigoku-danithermal 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 confirmedthat this convenient observation system is satisfied for the practical use.
2012-03-19

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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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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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－