Tracking secondary lahar flow paths and characterizing pulses and surges using infrasound array networks at Volcán de Fuego, Guatemala

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Ashley Bosa
https://orcid.org/0000-0002-6981-0306
Jeffrey B. Johnson
Silvio De Angelis
John J. Lyons
Amilcar Roca
https://orcid.org/0000-0002-7920-1141
Jacob F. Anderson
https://orcid.org/0000-0001-6447-6778
Armando Pineda
https://orcid.org/0000-0002-2482-8174

Abstract

Lahars are one of the greatest hazards at many volcanoes, including Volcán de Fuego (Guatemala). On 1 December 2018 at 8:00pm local Guatemala time (2:00:00 UTC), an hour-long lahar event was detected at Volcán de Fuego by two permanent seismo-acoustic stations along the Las Lajas channel on the southeast side. To establish the timing, duration, and speed of the lahar, infrasound array records were examined to identify both the source direction(s) and the correlated energy fluctuations at the two stations. Co-located seismic and acoustic signals were also examined, which indicated at least 5 distinct energy pulses within the lahar record.  We infer that varying sediment load and/or changes in flow velocity is shown by clear fluctuations in the acoustic and seismic power recorded at one of the stations. This particular event studied with infrasound provides insight into how lahars occur around Volcán de Fuego.

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How to Cite
Bosa, A., Johnson, J. ., De Angelis, S., Lyons, J., Roca, A., Anderson, J. and Pineda, A. (2021) “Tracking secondary lahar flow paths and characterizing pulses and surges using infrasound array networks at Volcán de Fuego, Guatemala ”, Volcanica, 4(2), pp. 239–256. doi: 10.30909/vol.04.02.239256.
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