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Near-field source effects of the Tonga Lamb wave
  • Milton A. Garces,
  • Brian P. Williams,
  • Mertixell Colet
Milton A. Garces
Infrasound Laboratory, HIGP, UH Manoa

Corresponding Author:[email protected]

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Brian P. Williams
Infrasound Laboratory, HIGP, UH Manoa
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Mertixell Colet
Infrasound Laboratory, HIGP, UH Manoa
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Abstract

A weather station in Nukuʻalofa (NUKU), Tonga, ~68km away from the epicenter of the 2022 Tonga eruption, recorded exceptional pressure, temperature, and wind data representative of the eruption source hydrodynamics. These high-quality data are available for further source and propagation studies. In contrast to other barometers and infrasound sensors at greater ranges, the NUKU barometer recorded a decrease in pressure during the climactic stage of the eruption. A simple fluid dynamic explanation of the depressurization is provided, with a commentary on near- vs far-field pressure observations of very large eruptions.