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GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 20, 2023, doi:10.1029/2003GL018038, 2003

Infrasonic tremor observed at Kīlauea Volcano, Hawai'i

M. Garcés

HIGP, SOEST, University of Hawai'i at Mānoa, Hawai'i, USA


A. Harris

HIGP, SOEST, University of Hawai'i at Mānoa, Hawai'i, USA


C. Hetzer

HIGP, SOEST, University of Hawai'i at Mānoa, Hawai'i, USA


J. Johnson

HIGP, SOEST, University of Hawai'i at Mānoa, Hawai'i, USA


S. Rowland

HIGP, SOEST, University of Hawai'i at Mānoa, Hawai'i, USA


E. Marchetti

Dipartimento di Scienze della Terra, Università di Firenze, Firenze, Italy


P. Okubo

U.S. Geological Survey, Hawaiian Volcano Observatory, Hawai'i Volcanoes National Park, Hawai'i, USA


Abstract

Infrasonic array data collected at Kīlauea Volcano, Hawai'i, during November 12–21, 2002 indicate that the active vents and lava tube system near the Pu'u 'Ō'ō vent complex emit almost continuous infrasound in the 0.3–10 Hz frequency band. The spectral content of these infrasonic signals matches well that of synchronous seismic tremor. In sites protected from wind noise, significant signal to noise ratios were recorded as far as ∼13 km from the crater of Pu'u 'Ō'ō. The infrasonic recordings suggest that one or more tremor sources may be close to the surface. In addition, these results demonstrate that adequate site and instrument selections for infrasonic arrays are essential in order to obtain consistent and reliable infrasonic detections.

Received 23 June 2003; accepted 15 September 2003; published 16 October 2003.

Index Terms: 8409 Volcanology: Atmospheric effects (0370); 8419 Volcanology: Eruption monitoring (7280); 8414 Volcanology: Eruption mechanisms.

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Citation: Garcés, M., A. Harris, C. Hetzer, J. Johnson, S. Rowland, E. Marchetti, and P. Okubo (2003), Infrasonic tremor observed at Kīlauea Volcano, Hawai'i, Geophys. Res. Lett., 30(20), 2023, doi:10.1029/2003GL018038.