Phys.org November 4, 2024
Researchers in Japan analyzed seismometer data recorded in Fiji and Futuna located over 750 km away. They extracted Rayleigh waves and estimated their powers and source directions, assuming retrograde particle motions. They found a Rayleigh wave from the HTHH’s direction about 15 min before the eruption onset. The arrival time difference of the Rayleigh wave between the two stations was consistent with that of the M5.8 earthquake during the eruption located beneath the HTHH. Referring to other seismic signals and satellite images, they concluded that the Rayleigh wave was the most significant eruption precursor with no apparent surface activity. Including their findings and results of previous studies, the researchers proposed a scenario of the beginning of the caldera-forming eruption… read more. Open Access TECHNICAL ARTICLE
(a) A map (Google Earth) of the seismic stations (MSVF and FUTU) about 750 km from the HTHH… Credit: Volume51, Issue21, 16 November 2024, e2024GL111144