Characterization of the luminance and shape of ash particles at Sakurajima volcano, Japan, using CCD camera images

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• 作者：Takahiro Miwa (1) (2)
  Taketo Shimano (3)
  Takeshi Nishimura (1)
  
  1. Department of Geophysics ; Graduate School of Science ; Tohoku University ; Aramaki-Aza Aoba 6-3 ; Aoba-ku ; Sendai ; Miyagi ; 980-8578 ; Japan
  2. National Research Institute for Earth Science and Disaster Prevention ; Tennodai 3-1 ; Tsukuba ; Ibaraki ; 305-0006 ; Japan
  3. Graduate School of Environment and Disaster Research ; Tokoha University ; 325 Obuchi Fuji ; Shizuoka ; 417-0801 ; Japan
  
• 关键词：Volcanic ash ; CCD camera ; Image analysis ; Petrologic monitoring
• 刊名：Bulletin of Volcanology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：77
• 期：1
• 全文大小：1,286 KB
• 参考文献：1. Aramaki, S, Kobayashi, T (1986) Change of the whole-rock chemical composition of the recent ejecta of Minamidake, Sakurajima. Bull Volcanol Soc Jpn 31: pp. 146
  2. Brandt, S (1976) Statistical and computational methods in data analysis. North-Holland Publishing Company, Amsterdam
  3. Cashman, KV, Hoblitt, RP (2004) Magmatic precursors to the 18 May 1980 eruption of Mount St. Helens, USA. Geology 32: pp. 141-144 10.1130/G20078.1" target="_blank" title="It opens in new window">CrossRef
  4. Cioni, R, D鈥橭riano, C, Bertagnini, A (2008) Fingerprinting ash deposits of small scale eruptions by their physical and textural features. J Volcanol Geotherm Res 177: pp. 277-287 10.1016/j.jvolgeores.2008.06.003" target="_blank" title="It opens in new window">CrossRef
  5. Dellino, P, Liotino, G (2002) The fractal and multifractal dimension of volcanic ash particles contour: a test study on the utility and volcanological relevance. J Volcanol Geotherm Res 113: pp. 1-18 10.1016/S0377-0273(01)00247-5" target="_blank" title="It opens in new window">CrossRef
  6. Dellino P, Gudmundsson MT, Larsen G, Mele D, Stevenson JA, Thordarson T, Zimanowski B (2012) Ash from the Eyjafjallajokull eruption (Iceland): fragmentation processes and aerodynamic behavior. J Geophys Res 117: B00C04, doi: 10.1029/2011JB008726
  7. D鈥橭riano, C, Bertagnini, A, Pompilio, M (2011) Ash erupted during normal activity at Stromboli (Aeolian Islands, Italy) raises questions on how the feeding system works. Bull Volcanol 73: pp. 471-477 10.1007/s00445-010-0425-0" target="_blank" title="It opens in new window">CrossRef
  8. Fukuyama, H (1978) Geology of Sakurajima volcano, southern Kyushu. J Geol Soc Jpn 84: pp. 309-316 10.5575/geosoc.84.309" target="_blank" title="It opens in new window">CrossRef
  9. Genareau K, Proussevitch AA, Durant AJ, Mulukutla G, Sahagian DL (2012) Sizing up the bubbles that produce very fine ash during explosive volcanic eruptions. Geophys Res Lett 39:L15306
  10. Heiken, G, Wohletz, K (1985) Volcanic ash. University of California Press, Los Angeles
  11. Iguchi, M, Tameguri, T, Ohta, Y, Ueki, S, Nakao, S (2013) Characteristics of volcanic activity at Sakurajima volcano鈥檚 Showa crater during the period 2006 to 2011. Bull Volcanol Soc Jpn 58: pp. 115-135
  12. Ishihara, K (2000) Characteristics and the occurring field of vulcanian eruption. Chikyu Monthly 22: pp. 308-314
  13. Kobayashi T, Miki D, Sasaki H, Iguchi M, Yamamoto T, Uto K (2013) Geological map of Sakurajima volcano, 2nd edn. Japan, Geological Survey of Japan.
  14. Lautze, NC, Taddeucci, J, Andronico, D, Cannata, C, Tornetta, L, Scarlato, P, Houghton, B, Lo Castro, MD (2012) SEM-based methods for the analysis of basaltic ash from weak explosive activity at Etna in 2006 and the 2007 eruptive crisis at Stromboli. Phys Chem Earth 45鈥?6: pp. 113-127 10.1016/j.pce.2011.02.001" target="_blank" title="It opens in new window">CrossRef
  15. Mandelbrot, BB (1982) The fractal geometry of nature. W. H. Freeman, New York
  16. Maria, A, Carey, S (2007) Quantitative discrimination of magma fragmentation and pyroclastic transport processes using the fractal spectrum technique. J Volcanol Geotherm Res 161: pp. 234-246 10.1016/j.jvolgeores.2006.12.006" target="_blank" title="It opens in new window">CrossRef
  17. Matsumoto, A, Nakagawa, M, Amma-Miyasaka, M, Iguchi, M (2013) Temporal variations of the petrological features of juvenile materials during 2006 to 2010 from Showa crater, Sakurajima Volcano, Kyushu, Japan. Bull Volcanol Soc Jpn 58: pp. 191-212
  18. Miwa, T, Toramaru, A (2013) Conduit process in vulcanian eruptions at Sakurajima volcano, Japan: inference from comparison of volcanic ash with pressure wave and seismic data. Bull Volcanol 75: pp. 1-13 10.1007/s00445-012-0685-y" target="_blank" title="It opens in new window">CrossRef
  19. Miwa, T, Toramaru, A, Iguchi, M (2009) Correlations of volcanic ash texture with explosion earthquakes from vulcanian eruptions at Sakurajima volcano, Japan. J Volcanol Geotherm Res 184: pp. 473-486 10.1016/j.jvolgeores.2009.05.012" target="_blank" title="It opens in new window">CrossRef
  20. Miwa, T, Geshi, N, Shinohara, H (2013) Temporal variation in volcanic ash texture during a vulcanian eruption at the Sakurajima volcano, Japan. J Volcanol Geotherm Res 260: pp. 80-89 10.1016/j.jvolgeores.2013.05.010" target="_blank" title="It opens in new window">CrossRef
  21. Riley CM, Rose WI, Bluth GJS (2003) Quantitative shape measurements of distal volcanic ash. J Geophys Res 108. doi: 10.1029/2001JB000818
  22. Russell, DA, Hanson, JD, Ott, E (1980) Dimension of strange attractors. Phys Rev Lett 45: pp. 1175-1178 10.1103/PhysRevLett.45.1175" target="_blank" title="It opens in new window">CrossRef
  23. Shimano, T, Nishimura, T, Chiga, N, Shibasaki, Y, Iguchi, M, Miki, D, Yokoo, A (2013) Development of automatic volcanic ash sampling apparatus at active volcanoes. Bull Volcanol 75: pp. 1-7 10.1007/s00445-013-0773-7" target="_blank" title="It opens in new window">CrossRef
  24. Suzuki, Y, Nagai, M, Maeno, F, Yasuda, A, Hokanishi, N, Shimano, T, Ichihara, M, Kaneko, T, Nakada, S (2013) Precursory activity and evolution of the 2011 eruption of Shinmoe-dake in Kirishima volcano鈥攊nsights from ash samples. Earth Planet Space 65: pp. 591-607 10.5047/eps.2013.02.004" target="_blank" title="It opens in new window">CrossRef
  25. Taddeucci J, Pompilio M, Scarlato P (2002) Monitoring the explosive activity of the July鈥揂ugust 2001 eruption of Mt. Etna (Italy) by ash characterization. Geophys Res Lett 29(8). doi:10.1029/2001GL014372
  26. Watanabe, K, Danhara, T, Watanabe, K, Terai, K, Yamashita, T (1999) Juvenile volcanic glass erupted before the appearance of the 1991 lava dome, Unzen volcano, Kyushu, Japan. J Volcanol Geotherm Res 89: pp. 113-121 10.1016/S0377-0273(98)00127-9" target="_blank" title="It opens in new window">CrossRef
  27. Wright, HMN, Cashman, KV, Mothes, PA, Hall, ML, Ruiz, AG, Pennec, JL (2012) Estimating rates of decompression from textures of erupted ash particles produced by 1999鈥?006 eruptions of Tungurahua volcano, Ecuador. Geology 40: pp. 619-622 10.1130/G32948.1" target="_blank" title="It opens in new window">CrossRef
  28. Yamanoi, Y, Takeuchi, S, Okumura, S, Nakashima, S, Yokoyama, T (2008) Color measurements of volcanic ash deposits from three different styles of summit activity at Sakurajima volcano, Japan: conduit processes recorded in color of volcanic ash. J Volcanol Geotherm Res 178: pp. 81-93 10.1016/j.jvolgeores.2007.11.013" target="_blank" title="It opens in new window">CrossRef
  
• 刊物主题：Geology; Geophysics/Geodesy; Mineralogy; Sedimentology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0819

文摘

We develop a new method for characterizing the properties of volcanic ash at the Sakurajima volcano, Japan, based on automatic processing of CCD camera images. Volcanic ash is studied in terms of both luminance and particle shape. A monochromatic CCD camera coupled with a stereomicroscope is used to acquire digital images through three filters that pass red, green, or blue light. On single ash particles, we measure the apparent luminance, corresponding to 256 tones for each color (red, green, and blue) for each pixel occupied by ash particles in the image, and the average and standard deviation of the luminance. The outline of each ash particle is captured from a digital image taken under transmitted light through a polarizing plate. Also, we define a new quasi-fractal dimension (D qf ) to quantify the complexity of the ash particle outlines. We examine two ash samples, each including about 1000 particles, which were erupted from the Showa crater of the Sakurajima volcano, Japan, on February 09, 2009 and January 13, 2010. The apparent luminance of each ash particle shows a lognormal distribution. The average luminance of the ash particles erupted in 2009 is higher than that of those erupted in 2010, which is in good agreement with the results obtained from component analysis under a binocular microscope (i.e., the number fraction of dark juvenile particles is lower for the 2009 sample). The standard deviations of apparent luminance have two peaks in the histogram, and the quasi-fractal dimensions show different frequency distributions between the two samples. These features are not recognized in the results of conventional qualitative classification criteria or the sphericity of the particle outlines. Our method can characterize and distinguish ash samples, even for ash particles that have gradual property changes, and is complementary to component analysis. This method also enables the relatively fast and systematic analysis of ash samples that is required for petrologic monitoring of ongoing activity, such as at the Sakurajima volcano.