Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy
Ken'Ichiro Yamashina, Takeshi Matsushima, Shiro Ohmi
Seismology and Volcanology
Using a pair of old and new photographs taken at the same location, a method named as a time-differential stereoscopy is successfully applied to detect visually the deformation at Unzen volcano, Japan. On September 6, 1992, gradual movement of a lava lobe was visible in a stereo image as relief surrounded by immobile areas. In this case, accelerated movement of a lava block was detected immediately before the time of its collapse, which resulted in the occurrence of a pyroclastic flow. In November 1994, growth of a lava spine was also measured with time-differential stereoscopy. A possible fluctuation of the growth rate might have correlated with an abnormal oscillation of tilt, with a period of about 40 h. This convenient photographic method is recommended for various occasions to detect volcanic and any other deformations as a supplement to precise instrumental measurements.
Journal of Volcanology and Geothermal Research
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Yamashina, KI., Matsushima, T., & Ohmi, S. (1999). Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy. Journal of Volcanology and Geothermal Research, 89(1-4), 73-80. https://doi.org/10.1016/S0377-0273(98)00124-3
Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy. / Yamashina, Ken'Ichiro; Matsushima, Takeshi; Ohmi, Shiro.
In: Journal of Volcanology and Geothermal Research, Vol. 89, No. 1-4, 04.1999, p. 73-80.
Yamashina, KI, Matsushima, T & Ohmi, S 1999, 'Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy', Journal of Volcanology and Geothermal Research, vol. 89, no. 1-4, pp. 73-80. https://doi.org/10.1016/S0377-0273(98)00124-3
Yamashina KI, Matsushima T, Ohmi S. Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy. Journal of Volcanology and Geothermal Research. 1999 Apr;89(1-4):73-80. doi: 10.1016/S0377-0273(98)00124-3
Yamashina, Ken'Ichiro ; Matsushima, Takeshi ; Ohmi, Shiro. / Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy. In: Journal of Volcanology and Geothermal Research. 1999 ; Vol. 89, No. 1-4. pp. 73-80.
@article{777722b512e5407fbf5156f60f66aeca,
title = "Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy",
abstract = "Using a pair of old and new photographs taken at the same location, a method named as a time-differential stereoscopy is successfully applied to detect visually the deformation at Unzen volcano, Japan. On September 6, 1992, gradual movement of a lava lobe was visible in a stereo image as relief surrounded by immobile areas. In this case, accelerated movement of a lava block was detected immediately before the time of its collapse, which resulted in the occurrence of a pyroclastic flow. In November 1994, growth of a lava spine was also measured with time-differential stereoscopy. A possible fluctuation of the growth rate might have correlated with an abnormal oscillation of tilt, with a period of about 40 h. This convenient photographic method is recommended for various occasions to detect volcanic and any other deformations as a supplement to precise instrumental measurements.",
author = "Ken'Ichiro Yamashina and Takeshi Matsushima and Shiro Ohmi",
journal = "Journal of Volcanology and Geothermal Research",
T1 - Volcanic deformation at Unzen, Japan, visualized by a time-differential stereoscopy
AU - Yamashina, Ken'Ichiro
AU - Matsushima, Takeshi
AU - Ohmi, Shiro
N2 - Using a pair of old and new photographs taken at the same location, a method named as a time-differential stereoscopy is successfully applied to detect visually the deformation at Unzen volcano, Japan. On September 6, 1992, gradual movement of a lava lobe was visible in a stereo image as relief surrounded by immobile areas. In this case, accelerated movement of a lava block was detected immediately before the time of its collapse, which resulted in the occurrence of a pyroclastic flow. In November 1994, growth of a lava spine was also measured with time-differential stereoscopy. A possible fluctuation of the growth rate might have correlated with an abnormal oscillation of tilt, with a period of about 40 h. This convenient photographic method is recommended for various occasions to detect volcanic and any other deformations as a supplement to precise instrumental measurements.
AB - Using a pair of old and new photographs taken at the same location, a method named as a time-differential stereoscopy is successfully applied to detect visually the deformation at Unzen volcano, Japan. On September 6, 1992, gradual movement of a lava lobe was visible in a stereo image as relief surrounded by immobile areas. In this case, accelerated movement of a lava block was detected immediately before the time of its collapse, which resulted in the occurrence of a pyroclastic flow. In November 1994, growth of a lava spine was also measured with time-differential stereoscopy. A possible fluctuation of the growth rate might have correlated with an abnormal oscillation of tilt, with a period of about 40 h. This convenient photographic method is recommended for various occasions to detect volcanic and any other deformations as a supplement to precise instrumental measurements.
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research