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• W2023776171 abstract "The results of a hydroacoustic monitoring experiment in the Kelut Crater lake, Indonesia, prior to its 1990 eruption, are presented, with the benefit of hindsight. Indeed, the underwater noise levels in three widely separated frequency bands, together with the lake water temperature, was radio-transmitted and almost continuously recorded from a period of quiescence of the volcano till the onset of its 10 February 1990, eruption, which destroyed the monitoring buoy. The comparative analysis of the noise variations in the three bands, together with seismic and temperature data, have shed light on the mechanisms underlying the pre-eruptive activity. The three acoustic levels had shown conspicuous, yet distinctive, changes prior to the eruption. Acoustic level in the low-frequency (1–50 Hz) band, which increased one year before the resumption of seismic activity and the lake warming up, is interpreted as the result of boiling at depth. The source of high-acoustic level in the audiometric (500–5000 Hz) range is clearly the bubbling of volcanic gases, occurring as a strong convective column in the middle of the lake. From the variations of this audiometric level, we have estimated that the degassing rate in the lake increased by a hundred-fold during the pre-eruptive period. Variations of ultrasonic (20–100 kHz) frequency acoustic level seem to be related with pressure and thermal changes within the hydrothermal system and its rock matrix beneath the lake. In conclusion, this experiment demonstrates the potential of hydroacoustic monitoring as an early warning system at crater lake volcanoes." @default.
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• W2023776171 date "2000-04-01" @default.
• W2023776171 modified "2023-10-17" @default.
• W2023776171 title "Hydroacoustic noise precursors of the 1990 eruption of Kelut Volcano, Indonesia" @default.
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• W2023776171 doi "https://doi.org/10.1016/s0377-0273(99)00176-6" @default.
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