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VOLCANO MONITORING

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PUZZLING FALSE ALARM<br />

DEFORMATION, EARTHQUAKES, BUT NO ERUPTION<br />

LOTS STILL TO BE LEARNED<br />

GPS showed rate of<br />

surface deformation<br />

increased by more<br />

than an order of<br />

magnitude from July -<br />

December 1997<br />

Newman et al., 2001<br />

Increased<br />

deformation rate led<br />

increase in seismic<br />

moment by several<br />

months, an<br />

observation with<br />

important<br />

implications for<br />

hazard monitoring

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