Earth, Planets and Space

, Volume 55, Issue 6, pp e13–e16 | Cite as

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

  • Meilano Irwan
  • Fumiaki Kimata
  • Naoyuki Fujii
  • Shigeo Nakao
  • Hidehumi Watanabe
  • Shinichi Sakai
  • Motoo Ukawa
  • Eisuki Fujita
  • Koji Kawai
Open Access
Letter

Abstract

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.

Key words

Miyakejima rapid deformation kinematic GPS 

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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2003

Authors and Affiliations

  • Meilano Irwan
    • 1
  • Fumiaki Kimata
    • 1
  • Naoyuki Fujii
    • 1
  • Shigeo Nakao
    • 2
  • Hidehumi Watanabe
    • 2
  • Shinichi Sakai
    • 2
  • Motoo Ukawa
    • 3
  • Eisuki Fujita
    • 3
  • Koji Kawai
    • 4
  1. 1.Graduate School of Environmental Studies, Research Center for Seismology and VolcanologyNagoya UniversityNagoyaJapan
  2. 2.Earthquake Research InstituteUniversity of TokyoTokyoJapan
  3. 3.National Research Institute for Earth Science and Disaster PreventionTsukubaJapan
  4. 4.Japan Hydrographic DepartmentMarine PreservationTokyoJapan

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