Bulletin of Volcanology

, Volume 61, Issue 7, pp 491–493 | Cite as

Comment on " Volume of magma accumulation or withdrawal estimated from surface uplift or subsidence, with application to the 1960 collapse of Kīlauea volcano" by P. T. Delaney and D. F. McTigue

  • Daniel J. Johnson
  • Freysteinn Sigmundsson
  • Paul T. Delaney


 In volcanoes that store a significant quantity of magma within a subsurface summit reservoir, such as Kīlauea, bulk compression of stored magma is an important mode of deformation. Accumulation of magma is also accompanied by crustal deformation, usually manifested at the surface as uplift. These two modes of deformation – bulk compression of resident magma and deformation of the volcanic edifice – act in concert to accommodate the volume of newly added magma. During deflation, the processes reverse and reservoir magma undergoes bulk decompression, the chamber contracts, and the ground surface subsides. Because magma compression plays a role in creating subsurface volume to accommodate magma, magma budget estimates that are derived from surface uplift observations without consideration of magma compression will underestimate actual magma volume changes.

Key words Mogi Dislocations Deformation Magma compressibility Kīlauea Gravity variations 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Daniel J. Johnson
    • 1
  • Freysteinn Sigmundsson
    • 2
  • Paul T. Delaney
    • 3
  1. 1.Department of Geology, Central Washington University, Ellensburg, WA 98926, USA e-mail: Fax: +1-509-9632821US
  2. 2.Nordic Volcanological Institute, Grensasvegur 50, IS-108, Reykjavik, IcelandIS
  3. 3.U.S. Geological Survey, 2255 North Gemini Drive, Flagstaff, AZ 86001, USAUS

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