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 |
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| Authors: | Daniel J Johnson Freysteinn Sigmundsson Paul T Delaney |
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| Institution: | (1) Department of Geology, Central Washington University, Ellensburg, WA 98926, USA e-mail: dan@geology.cwu.edu Fax: +1-509-9632821, US;(2) Nordic Volcanological Institute, Grensasvegur 50, IS-108, Reykjavik, Iceland, IS;(3) U.S. Geological Survey, 2255 North Gemini Drive, Flagstaff, AZ 86001, USA, US |
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| Abstract: | 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.
Received: 30 September 1998 / Accepted: 27 July 1999 |
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| Keywords: | Mogi Dislocations Deformation Magma compressibility Kī lauea Gravity variations |
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