Recordings of Long-Period Fluctuations Associated with the Passage of Three Distinct Tsunamis at Broadband Seismometers Made at the International Monitoring System (IMS) Hydroacoustic T-station H06 (Socorro Island, Mexico)

Poplavskiy, Alexander; Bras, Ronan J. Le

doi:10.1785/0220120116

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The recording of tsunamis on near-shore seismic stations has been described previously (e.g., Yuan et al, 2005;Okal, 2007;Poplavskiy and Le Bras, 2013). However, the seismic recording of the oceanic gravity wave presented so far is limited to a few hours of duration following the tsunami arrival.…”

Section: Uniqueness Of the Observationmentioning

confidence: 99%

Seismic record of a long duration dispersive signal after the 15 January 2022 Hunga-Tonga eruption

Diaz

2023

Seismica

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Data acquired by broadband seismic stations distributed around the world are used to document the exceptionally long duration signal from the tsunami-associated gravity wave that followed the January 2022 Hunga-Tonga eruption. The first arrivals of this wave, with a frequency of around 2 mHz, are recorded at the time the tsunami arrives to each station, but the highest recorded frequencies, which reach 40 mHz, arrive 5 days later at some sites, following the prediction of a gravity wave originating at the Hunga-Tonga region and traveling in deep water. This dispersive signal is detected in most of the stations located in the Pacific Ocean basin and its coasts, but also in the Indian Ocean, Antarctica, and some stations in North America located hundreds of kilometers from the coastline. The signal is compared with the data gathered after earthquakes that have produced large tsunamis, showing that the seismic records from the Hunga-Tonga eruption are very different. Following the hypothesis pointed out by Omira et al 2023, we propose that the origin of this exceptional characteristic is due to the interaction between the tsunami and atmospheric waves that travel a little faster.

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Section: Uniqueness Of the Observationmentioning

confidence: 99%

Seismic record of a long duration dispersive signal after the 15 January 2022 Hunga-Tonga eruption

Diaz

2023

Seismica

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Principles of Forming Test Signals for Information-Measuring Systems in Seismic Monitoring

Шевченко

2016

Meas Tech

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The Hunga Tonga–Hunga Ha’apai Eruption of 15 January 2022: Observations on the International Monitoring System (IMS) Hydroacoustic Stations and Synergy with Seismic and Infrasound Sensors

Bras¹,

Zampolli²,

Metz³

et al. 2022

Seismological Research Letters

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Examination of the International Monitoring System (IMS) hydroacoustic data recorded during the 15 January 2022 eruption of the Hunga Tonga–Hunga Ha’apai (HTHH) volcano shows that the in-water hydroacoustic sensors recorded a long-duration (40 min) activity starting before and ending after the paroxysmal HTHH eruption at about 4:15 UTC. The main eruption at 4:15 UTC simultaneously generated low-frequency [0.001–0.05] Hz seismic body waves and large infrasound waves in the atmosphere, as well as a tsunami. The peak-to-peak pressure observed at the closest IMS station, IS22, 1850 km away from the source, was 340 Pa, dwarfing the largest previously observed record for the signal from the Chelyabinsk meteor. The infrasound waves included a Lamb wave containing periods at least up to 2000 s. The Lamb wave and tsunami are well recorded on infrasound and near-shore seismometers. The air wave generated a precursor tsunami ahead of the main tsunami, but we do not observe it on the hydroacoustic IMS network. The dispersive tail of the main tsunami is observed on four in-water hydroacoustic hydrophone stations, one of them as far as 16,120 km away in the Atlantic Ocean.

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Recordings of Long-Period Fluctuations Associated with the Passage of Three Distinct Tsunamis at Broadband Seismometers Made at the International Monitoring System (IMS) Hydroacoustic T-station H06 (Socorro Island, Mexico)

Cited by 3 publications

References 14 publications

Seismic record of a long duration dispersive signal after the 15 January 2022 Hunga-Tonga eruption

Seismic record of a long duration dispersive signal after the 15 January 2022 Hunga-Tonga eruption

Principles of Forming Test Signals for Information-Measuring Systems in Seismic Monitoring

The Hunga Tonga–Hunga Ha’apai Eruption of 15 January 2022: Observations on the International Monitoring System (IMS) Hydroacoustic Stations and Synergy with Seismic and Infrasound Sensors

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