A 1 kPa (10 cm H2O) 1024 1025 1027 857 Events per hour 80 70 60 50 40 30 20 10 0 7 June 1999 12 June 1999 17 June 1999 Time (days) Earthquakes per day B 140 120 100 80 60 40 20 0 1027 0.1 kPa (1 cm H2O) 0 50 Days from 8 June 1999 VOLCANO DEFORMATION– Geodetic Monitoring Techniques By Daniel Dzurisin U.S. Geological Survey graphics 100
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