Abstract
Hydrophone measurements of acoustic noise levels in the Crater Lake of Mount Ruapehu, New Zealand were made on 18 January 1991 from an inflatable rubber boat on the lake. The greatest sound pressures were recorded in the 1–10 Hz band, with sound levels generally decreasing about 20 dB per decade from 10 Hz to 80 kHz. The low frequency noise did not have an obvious relationship to the tremor observed at a seismic station within 1 km of the lake. The comparatively low levels of middle and high frequency sound meant that at the time of measurement, direct steam input did not make a significant contribution to the heating of Crater Lake. This is consistent with the earlier conclusion that during the last decade a major part of the heat input of Crater Lake has come from lake water that was heated below the lake and recycled back into the lake.
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Vandemeulebrouck, J., Hurst, A.W. & Poussielgue, N. Implications for the thermal regime of acoustic noise measurements in Crater Lake, Mount Ruapehu, New Zealand. Bull Volcanol 56, 493–501 (1994). https://doi.org/10.1007/BF00302830
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DOI: https://doi.org/10.1007/BF00302830