Changes in Seismic Anisotropy After Volcanic Eruptions: Evidence from Mount Ruapehu

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Science  21 Sep 2001:
Vol. 293, Issue 5538, pp. 2231-2233
DOI: 10.1126/science.1063463

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The eruptions of andesite volcanoes are explosively catastrophic and notoriously difficult to predict. Yet changes in shear waveforms observed after an eruption of Mount Ruapehu, New Zealand, suggest that forces generated by such volcanoes are powerful and dynamic enough to locally overprint the regional stress regime, which suggests a new method of monitoring volcanoes for future eruptions. These results show a change in shear-wave polarization with time and are interpreted as being due to a localized stress regime caused by the volcano, with a release in pressure after the eruption.

  • * Present address: Upper Hutt City Council, Private Bag 907, Upper Hutt, New Zealand.

  • To whom correspondence should be addressed. E-mail: Martha.Savage{at}

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