Rapid ground deformation of the Miyakejima volcano on 26-27 June 2000 detected by kinematic GPS analysis

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  • Irwan Meilano
    Graduate School of Environmental Studies, Research Center for Seismology and Volcanology, Nagoya University
  • Kimata Fumiaki
    Graduate School of Environmental Studies, Research Center for Seismology and Volcanology, Nagoya University
  • Fujii Naoyuki
    Graduate School of Environmental Studies, Research Center for Seismology and Volcanology, Nagoya University
  • Nakao Shigeo
    Earthquake Research Institute, University of Tokyo
  • Watanabe Hidehumi
    Earthquake Research Institute, University of Tokyo
  • Sakai Shinichi
    Earthquake Research Institute, University of Tokyo
  • Ukawa Motoo
    National Research Institute for Earth Science and Disaster Prevention
  • Fujita Eisuke
    National Research Institute for Earth Science and Disaster Prevention
  • Kawai Koji
    Japan Hydrographic Department, Marine Preservation

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Description

A kinematic GPS analysis of data from the Miyakejima volcano captured a fast developing deformation event on 26-27 June 2000 in unprecedented spatial and temporal detail. Initial ground deformation toward east and upward was observed in the southeastern part of the volcano at 18 : 00 on 26 June 2000, almost simultaneous with earthquake swarms. Some time after 21 : 30 on 26 June 2000 the displacements at these sites turned from eastward to westward. Three hours later the displacement rates increased gradually at GPS sites in the western part of Miyakejima as the seismicity migrated and approached the west coast, and reached a climax with submarine eruption at 09 : 00 on 27 June 2000. A Genetic Algorithm was used to explore the parameter space and to find the best fitting source geometry. This analysis leads to an interpretation that the 18 : 00 26 June earthquake swarm was caused by a dike intrusion near the Oyama crater. Starting from 21 : 30 this dike deflated and a new dike intruded near the west coast. Following the propagation of this dike to the offshore, a spherical source began deflating in the southwest of Oyama crater.

Journal

  • Earth, Planets and Space

    Earth, Planets and Space 55 (6), e13-e16, 2003

    Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences

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