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Earth, Planets and Space
Fig. 4. | Earth, Planets and Space

Fig. 4.

From: Gravity variation around Shinmoe-dake volcano from February 2011 through March 2012—Results of continuous absolute gravity observation and repeated hybrid gravity measurements

Fig. 4.

Schematic model of the short-term gravity signal preceding vulcanian eruptions. (a) The conduit is choked with plugs. (b) As the pressure in the magma chamber increases, the surface above the chamber is uplifted, leading to a gravity decrease. (c) When the pressure is released by rupture in the shallow part of the conduit, the surface subsides causing an increase in gravity. (d) Within a short time, the pressure release leads to an eruption emitting choking materials out of the conduit.

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