GPS連続観測結果が示唆する浅間火山のマグマ供給系(<特集>2004年浅間山噴火(1))

概要

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Continuous GPS measurements around the Asama volcano, central Japan, show a repetition of episodic inflations and deflations of the edifice. A correlation is found among plume height, seismicity and crustal deformation measured by the GPS. During the inflation period, increase of seismicity and rise of plume height were observed. A planar magmatic source situated at about 2km depth below the surface was inferred from the GPS data during both the inflating and deflating periods. It is also suggested that a buoyant bubble-rich magma surges episodically into the magma reservoir, then it loses the buoyancy through degassing process, and finally drains back to the further depth. Inflations of the edifice preceding the eruption were registered in the GPS data before both 2003 and 2004 crises, showing the usefulness of crustal deformation data for the prediction of the volcanic unrest of the Asama volcano.
特定非営利活動法人日本火山学会の論文
2005-10-31