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. Broadband seismic data collected on Ruapehu volcano, New Zealand, in 1994 and 1998 show that the 1995–1996 eruptions of Ruapehu resulted in a significant change in the frequency content of tremor and volcanic earthquakes at the volcano. The pre-eruption volcanic seismicity was characterized by several independent dominant frequencies, with a 2 Hz spectral peak dominating the strongest tremor and...
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