Bulletin of Volcanology

, 75:695 | Cite as

Magma discharge variations during the 2011 eruptions of Shinmoe-dake volcano, Japan, revealed by geodetic and satellite observations

  • Tomofumi Kozono
  • Hideki Ueda
  • Taku Ozawa
  • Takehiro Koyaguchi
  • Eisuke Fujita
  • Akihiko Tomiya
  • Yujiro J Suzuki
Research Article

Abstract

We present precise geodetic and satellite observation-based estimations of the erupted volume and discharge rate of magma during the 2011 eruptions of Kirishima-Shinmoe-dake volcano, Japan. During these events, the type and intensity of eruption drastically changed within a week, with three major sub-Plinian eruptions on January 26 and 27, and a continuous lava extrusion from January 29 to 31. In response to each eruptive event, borehole-type tiltmeters detected deflation of a magma chamber caused by migration of magma to the surface. These measurements enabled us to estimate the geodetic volume change in the magma chamber caused by each eruptive event. Erupted volumes and discharge rates were constrained during lava extrusion using synthetic aperture radar satellite imaging of lava accumulation inside the summit crater. Combining the geodetic volume change and the volume of lava extrusion enabled the determination of the erupted volume and discharge rate during each sub-Plinian event. These precise estimates provide important information about magma storage conditions in magma chambers and eruption column dynamics, and indicate that the Shinmoe-dake eruptions occurred in a critical state between explosive and effusive eruption.

Keywords

Shinmoe-dake Magma discharge Tilt SAR Eruption transition 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Tomofumi Kozono
    • 1
  • Hideki Ueda
    • 1
  • Taku Ozawa
    • 1
  • Takehiro Koyaguchi
    • 2
  • Eisuke Fujita
    • 1
  • Akihiko Tomiya
    • 3
  • Yujiro J Suzuki
    • 2
  1. 1.National Research Institute for Earth Science and Disaster PreventionTsukubaJapan
  2. 2.Earthquake Research InstituteUniversity of TokyoBunkyo-kuJapan
  3. 3.Geological Survey of Japan, AISTTsukubaJapan

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