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 output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

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.

Original languageEnglish
Article number695
Pages (from-to)1-13
Number of pages13
JournalBulletin of Volcanology
Volume75
Issue number3
DOIs
Publication statusPublished - 2013 Mar
Externally publishedYes

Keywords

  • Eruption transition
  • Magma discharge
  • SAR
  • Shinmoe-dake
  • Tilt

ASJC Scopus subject areas

  • Geochemistry and Petrology

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