Geosciences Journal

, Volume 22, Issue 2, pp 273–286 | Cite as

Growth and potential collapse of the lava dome in Unzen volcano and the estimation on block-and-ash flows

  • Xiao Shi
  • Yujing Jiang
  • Yasuyuki Hirakawa


Heisei lava dome was formed in Unzen volcano over the period from 1991 to 1995. The recent continuous observations have shown that the lava dome is still growing, which is a threat for the life of the nearby residents. How to estimate the range of collapse and potential block-and-ash flows is an urgent problem. Airborne laser scanning method is briefly introduced. We presented a division to separate the lava dome with 10 potential collapsed blocks and set some measuring points to observe the elevation change in each block. By analyzing the elevation decrease from 2003 to 2014, the potential collapsed blocks that experienced obvious changes were identified. With the evaluation of elevation changes by airborne laser data, the buried terrain of dome was reconstructed. The results show that the whole lava dome from lobe 1 to 11 may collapse, and the potential maximum volume of collapsed part is 1.46 × 107 m3. If the collapsed part forms block-and-ash flow, the flow will arrive at the seaside in approximately 7 minutes according to the result of simulation. The flow could travel approximately 8.5 km, and the average velocity is approximately 20 m/s.

Key words

lava dome volcano collapses airborne laser scanning data block-and-ash flow 


  1. Bardintzeff, J.M., 1984, Merapi Volcano (Java, Indonesia) and Merapi-Type Nuée Ardente. Bulletin of Volcanology, 47, 433–446.CrossRefGoogle Scholar
  2. Boudon, G., Camus, G., Gourgaud, A., and Lajoie. J., 1993, The 1984 nuée-ardente deposits of Merapi volcano, central Java, Indonesia: stratigraphy, textural characteristics, and transport mechanisms. Bulletin of Volcanology, 55, 327–342.CrossRefGoogle Scholar
  3. Calder, E.S., Luckett, R., Sparks, R.S.J., and Voight, B., 2002, Mechanisms of lava dome instability and generation of rockfalls and pyroclastic flows at Soufrière Hills Volcano, Montserrat. Memoirs–Geological Society of London, 21, 173–190.Google Scholar
  4. Carn, S.A., Watts, R.B., and Thompson, G., 2004, Anatomy of a lava dome collapse: the 20 March 2000 event at Soufrière Hills Volcano, Montserrat. Journal of Volcanology and Geothermal Research, 131, 241–264.CrossRefGoogle Scholar
  5. Chigira, M., Duan, F., Yagi, H., and Furuya, T., 2004, Using an airborne laser scanner for the identification of shallow landslides and susceptibility assessment in an area of ignimbrite overlain by permeable pyroclastics. Landslides, 1, 203–209.CrossRefGoogle Scholar
  6. Chigira, M., Nakamoto, M., and Nakata, E., 2002, Weathering mechanisms and their effects on the landsliding of ignimbrite subject to vapor-phase crystallization in the Shirakawa pyroclastic flow, northern Japan. Engineering Geology, 66, 111–125.CrossRefGoogle Scholar
  7. Doneus, M., Briese, C., Fera, M., and Janner, M., 2008, Archaeological prospection of forested areas using full-waveform airborne laser scanning. Journal of Archaeological Science, 35, 882–893.CrossRefGoogle Scholar
  8. Fink, J.H., 1991, Volcano warning needed. Nature, 351, 611.CrossRefGoogle Scholar
  9. Fiorillo, F. and Wilson, R.C., 2004, Rainfall induced debris flows in pyroclastic deposits, Campania (southern Italy). Engineering Geology, 75, 263–289.CrossRefGoogle Scholar
  10. Fujii, T. and Nakada, S., 1999, The 15 September 1991 pyroclastic flows at Unzen Volcano (Japan): a flow model for associated ash-cloud surges. Journal of Volcanology and Geothermal Research, 89, 159–172.CrossRefGoogle Scholar
  11. Goto, A., 1999, A new model for volcanic earthquake at Unzen Volcano: melt rupture model. Geophysical Research Letters, 26, 2541–2544.CrossRefGoogle Scholar
  12. Hoshizumi, H., Uto, K., and Watanabe, K., 1999, Geology and eruptive history of Unzen volcano, Shimabara Peninsula, Kyushu, SW Japan. Journal of Volcanology and Geothermal Research, 89, 81–94.CrossRefGoogle Scholar
  13. Kojima, K. and Yasui, Y., 2015, Estimation of S-wave velocity structure down to the seismic bedrock of Fukui Plain based on microtremor observation. Journal of Japan Society for Natural Disaster Science, 33, 359–374.Google Scholar
  14. Kraus, K. and Pfeifer, N., 1998, Determination of terrain models in wooded areas with airborne laser scanner data. ISPRS Journal of Photogrammetry and remote Sensing, 53, 193–203.CrossRefGoogle Scholar
  15. Lavigne, F. and Thouret, J.C., 2003, Sediment transportation and deposition by rain-triggered lahars at Merapi Volcano, central Java, Indonesia. Geomorphology, 49, 45–69.CrossRefGoogle Scholar
  16. Loughlin, S.C., Calder, E.S., Clarke, A., Cole, P.D., Luckett, R., Mangan, M.T., Pyle, D.M., Sparks, R.S.J., Voight, B., and Watts, B., 2002, Pyroclastic flows and surges generated by the 25 June 1997 dome collapse, Soufrière Hills Volcano, Montserrat. Geological Society of London, Memoirs, 21, 191–209.CrossRefGoogle Scholar
  17. Matsushima, T. and Takagi, A., 2000, GPS and EDM monitoring of Unzen volcano ground deformation. Earth Planets Space, 52, 1015–1018.CrossRefGoogle Scholar
  18. Mellors, R.A., Waitt, R.B., and Swanson, D.A., 1988, Generation of pyroclastic flows and surges by hot-rock avalanches from the dome of Mount St. Helens volcano, USA. Bulletin of Volcanology, 50, 14–25.CrossRefGoogle Scholar
  19. Nakada, S., 1996, Characteristics of lava dome eruption and dome growth model at Unzen Volcano. Memoirs of the Geological Society of Japan, 46, 139–148. (in Japanese with English abstract)Google Scholar
  20. Nakada, S., Miyake, Y., Sato, H., Oshima, O., and Fujinawa, A., 1995, Endogenous growth of dacite dome at Unzen volcano (Japan), 1993–1994. Geology, 23, 157–160.CrossRefGoogle Scholar
  21. Nakada, S., Shimizu, H., and Ohta, K., 1999, Overview of the 1990–1995 eruption at Unzen Volcano. Journal of Volcanology and Geothermal Research, 89, 1–22.CrossRefGoogle Scholar
  22. Ohta, K., 1996, Activity of lava dome of Mt. Fugen, Unzen. International volcano workshop report of 50th anniversary of Showashinzan generation, p. 11–21. (in Japanese)Google Scholar
  23. Ohta, K., 1997, Reviews on the prediction of the l990–1995 eruption of Unzen Volcano and supporting system for risk management. Volcanological Society of Japan, 42, 61–74.Google Scholar
  24. Okasaki, K., Takahashi, H., Nakao, S., and Kasahara, M., 2002, Ground change of Usuzan in 2000 eruption based on GPS observation. Chikyu Monthly Extra edition, 39, 22–28. (in Japanese)Google Scholar
  25. Rodriguez-Elizarraras, S., Siebe, C., Komorowski, J.C., Espíndola, J.M., and Saucedo, R., 1991, Field observations of pristine block- and ash-flow deposits emplaced April 16–17, 1991 at Volcan de Colima, Mexico. Journal of volcanology and geothermal research, 48, 399–412.CrossRefGoogle Scholar
  26. Rose, W.I., 1987, Volcanic activity at Santiaguito volcano, 1976–1984. Geological Society of America Special Papers, 212, 17–28.CrossRefGoogle Scholar
  27. Rose, W.I., Pearson, T., and Bonis, S., 1976, Nuee ardente eruption from the foot of a dacite lava flow, Santiaguito Volcano, Guatemala. Bulletin Volcanologique, 40, 23–38.CrossRefGoogle Scholar
  28. Sato, H., Fujii, T., and Nakada, S., 1992, Crumbling of dacite dome lava and generation of pyroclastic flows at Unzen volcano. Nature, 360, 664–666.CrossRefGoogle Scholar
  29. Sheridan, M.F. and Macias, J., 1995, Estimation of risk probability for gravity-driven pyroclastic flows at Volcan Colima, Mexico. Journal of Volcanology and Geothermal Research, 66, 251–256.CrossRefGoogle Scholar
  30. Sparks, R.S.J., Wilson, L., and Hulme, G., 1978, Theoretical modeling of the generation, movement, and emplacement of pyroclastic flows by column collapse. Journal of Geophysical Research: Solid Earth, 83, 1727–1739.CrossRefGoogle Scholar
  31. Ui, T., Matsuwo, N., Sumita, M., and Fujinawa, A., 1999, Generation of block and ash flows during the 1990–1995 eruption of Unzen volcano, Japan. Journal of Volcanology and Geothermal Research, 89, 123–137.CrossRefGoogle Scholar
  32. Voight, B., Linde, A.T., Sacks, I.S., Mattioli, G.S., Sparks, R.S.J., Elsworth, D., Hidayat, D., Malin, P.E., Shalev, E., Widiwijayanti, C., Young, S.R., Bass, V., Clarke, A., Dunkley, P., Johnston, W., McWhorter, N., Neuberg, J., and Williams, P., 2006, Unprecedented pressure increase in deep magma reservoir triggered by lava-dome collapse. Geophysical Research Letters, 33, L03312.CrossRefGoogle Scholar
  33. Wadge, G., Macfarlane, D.G., Odbert, H.M., James, M.R., Hole, J.K., Ryan, G., Bass, V., DeAngelis, S., Pinkerton, H., Robertson, D.A., and Loughlin, S.C., 2008, Lava dome growth and mass wasting measured by a time series of ground-based radar and seismicity observations. Journal of Geophysical Research: Solid Earth, 113, B08210.CrossRefGoogle Scholar
  34. Wang, C.X., Li, S., and Esaki, T., 2006, GIS-based two-dimensional numerical simulation of rainfall-induced debris flow. Natural Hazards and Earth System Science, 8, 47–58.CrossRefGoogle Scholar
  35. Watanabe, K., Hoshizumi, H., and Ikebe, S., 1992, The eruption of Fugen-dake from November 1990 to May 1991, Unzen volcano Japan–from the beginning of the eruption to the formation of the lava dome. Memoirs Faculty of Education Kumamoto University Natural Sciences, 41, 47–60. (in Japanese with English abstract)Google Scholar
  36. Wehr, A. and Lohr, U., 1999, Airborne laser scanning–an introduction and overview. ISPRS Journal of Photogrammetry and Remote Sensing, 54, 68–82.CrossRefGoogle Scholar
  37. Wilkes, P., Jones, S.D., Suarez, L., Haywood, A., Mellor, A., Woodgate, W., Soto-Berelov, M., and Skidmore, A.K., 2015, Using discretereturn airborne laser scanning to quantify number of canopy strata across diverse forest types. Methods in Ecology and Evolution, 7, 700–712.CrossRefGoogle Scholar
  38. Woods, A.W. and Caulfield, C.C.P., 1992, A laboratory study of explosive volcanic eruptions. Journal of Geophysical Research: Solid Earth, 97, 6699–6712.CrossRefGoogle Scholar
  39. Woods, A.W., Sparks, R.S.J., Ritchie, L.J., Batey, J., Gladstone, G., and Bursik, M.I., 2002, The explosive decompression of a pressurized volcanic dome: the 26 December 1997 collapse and explosion of Soufrière Hills Volcano, Montserrat. Geological Society of London, Memoirs, 21, 457–465.CrossRefGoogle Scholar
  40. Yamamoto, T., Takarada, S., and Suto, S., 1993, Pyroclastic flows from the 1991 eruption of Unzen volcano, Japan. Bulletin of Volcanology, 55, 166–175.CrossRefGoogle Scholar

Copyright information

© The Association of Korean Geoscience Societies and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Mechanics Research CenterQingdao University of Science and TechnologyQingdaoChina
  2. 2.School of EngineeringNagasaki UniversityNagasakiJapan
  3. 3.State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and TechnologyShandong University of Science and TechnologyQingdaoChina
  4. 4.Asia Air Survey Co. Ltd.FukuokaJapan

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