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Magma ascent rate is a fundamental physical parameter in determining the behavior of a volcanic eruption. Magma ascent rate can be estimated in several ways, during ascent and eruption by geophysical methods, or after the eruption using geochemical and petrological methods. One example of a geophysical method is the analysis of volcanic earthquakes, in which the progressive migration of tremors from a depth to the surface is interpreted as the upward migration of ascending magma (e.g., Aki & Koyanagi, 1981;Klein et al., 1987;Scandone & Malone, 1985;Tryggvason, 1994). Geochemical methods to determine magma ascent rate are numerous but most of them are only applicable to limited melt compositions. In andesitic magma for instance, the thickness of amphibole breakdown rims has been used to determine ascent rates based on the experimentally determined rate of the breakdown reaction (e.g.

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