Atmospheric modes excited by the 2021 August eruption of the Fukutoku-Okanoba volcano, Izu–Bonin Arc, observed as harmonic TEC oscillations by QZSS

Heki, Kosuke; Fujimoto, Tatsuya

doi:10.1186/s40623-022-01587-5

Cited by 25 publications

(31 citation statements)

References 13 publications

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“…Using such GNSS-TEC techniques, we detected ionospheric responses to large volcanic eruptions in Japan and in the world. They occur as harmonic oscillations of TEC (e.g., Nakashima et al 2016;Shults et al 2016;Shestakov et al 2021;Heki and Fujimoto 2022), and as N-shaped short pulses of TEC changes (e.g., Heki 2006;Cahyadi et al 2021), after continuous Plinian eruptions and Vulcanian explosions, respectively. Both types of the disturbance signals propagate outward with a speed of 0.8-1.0 km/s, the acoustic wave velocity in the ionospheric F region.…”

Section: Introductionmentioning

confidence: 99%

Ionospheric signatures of repeated passages of atmospheric waves by the 2022 Jan. 15 Hunga Tonga-Hunga Ha’apai eruption detected by QZSS-TEC observations in Japan

Heki

2022

Earth Planets Space

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A large eruption occurred on Jan. 15, 2022, at the submarine volcano Hunga Tonga-Hunga Ha’apai, southern Pacific, and the atmospheric Lamb wave was observed to have traveled round the Earth multiple times with a speed of ~ 0.3 km/s. Here, I compare their ionospheric and atmospheric signatures using data from dense arrays of barometers and GNSS stations in Japan. I confirmed that the ionospheric disturbances passed over Japan at least four times, first from SE to NW, then from NW to SE, again from SE to NW, and finally from NW to SE. The propagation velocity of the ionospheric disturbances was as fast as the atmospheric Lamb wave, suggesting their origin as upward energy leakage from the troposphere. The first passage of the ionospheric disturbance started prior to the arrival of the Lamb pulse, but its physical mechanism is yet to be explored. Unlike the barometric records, waveforms and amplitudes of ionospheric disturbances exhibit large diversity along the wavefront, suggesting their turbulent nature. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Ionospheric signatures of repeated passages of atmospheric waves by the 2022 Jan. 15 Hunga Tonga-Hunga Ha’apai eruption detected by QZSS-TEC observations in Japan

Heki

2022

Earth Planets Space

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“…Together with the ground-based GNSS measurements, the prominent ionospheric effects induced by the Hunga Tonga volcano explosion were also observed from the satellites of the ICE and GOLD missions situated, correspondingly, both at the low-Earth and geostationary orbits [9]. Generally, it is known that large volcano eruptions cause ionospheric disturbances of various kinds [10,11] which are believed to arise from the upward leakage of the energy of Lamb waves. The energy can be transmitted into the ionosphere through an atmospheric resonance at the frequency of acoustic-gravity oscillations, which stipulates large amplitude of the waves at high altitude [8].…”

Section: Introductionmentioning

confidence: 85%

Disturbances in the Doppler frequency shift of ionospheric signal and in telluric current caused by the atmospheric waves from an explosive eruption of Hunga Tonga volcano on January 15, 2022

Salikhov,

Shepetov,

Pak

et al. 2023

Preprint

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After an explosive eruption of the Hunga Tonga volcano on January 15, 2022, disturbances were observed at a distance of about 12000 km in Northern Tien Shan among the variations of the atmosphere pressure, of telluric current, and of the Doppler frequency shift of ionospheric signal. At 16:00:55 UTC a pulse of atmospheric pressure was detected there with a peak amplitude of 1.3 hPa and propagation speed of 0.3056 km/s, equal to the velocity of Lamb wave. In the variations of the Doppler frequency shift, the disturbances of two types were registered on the 3212 km and 2969 km long inclined radio-paths, one of which arose as a response to the passage of a Lamb wave (0.3059 km/s) through the reflection point of radio wave, and another as reaction to the acoustic-gravity wave (0.2602 km/s). Two successive perturbations were also detected in the records of telluric current at the arrival times of the Lamb and acoustic-gravity waves into the registration point. According to the parameters of the Lamb wave, an energy transfer into the atmosphere at the explosion of the Hunga Tonga volcano was roughly estimated as 2000 Mt of TNT equivalent.

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“…Geometry of the line‐of‐sight and wavefront controls AW amplitudes in TEC, and a large signal is expected when the line‐of‐sight penetrates the wavefront with a shallow angle (e.g., Bagiya et al., 2019; Heki & Fujimoto, 2022). Such relationship is not well understood for IGW.…”

Section: Discussionmentioning

confidence: 99%

Slow Fault Slip Signatures in Coseismic Ionospheric Disturbances

Heki

Bagiya

Takasaka

2022

Geophysical Research Letters

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Frequency spectra of seismic waves from a ruptured fault reflects fault sizes, that is, those by larger magnitude earthquakes are richer in longer-period seismic waves. They also reflect rupture speeds of faults. Tsunami earthquakes are defined as those exciting large tsunamis for their surface wave magnitudes (Kanamori, 1972). They show large departure between surface wave magnitudes (M s ) and moment magnitudes (M w ), as represented by the 1896 Meiji-Sanriku earthquake, NE Japan, with M s = 7.2 and M w = 8.0 (Tanioka & Satake, 1996). Such departure would be due partly to the small rigidity of soft sediments near trenches. It is also due to slow faulting, that is, a longer duration of fault slip may excite tsunamis more efficiently than ordinary earthquakes. Does this apply for atmospheric waves caused by coseismic vertical crustal movements?We could answer this question by observing ionospheric disturbances using dual-frequency global navigation satellite system (GNSS) receivers. Atmospheric waves from epicenter propagate upward and often disturb ionospheric F region, typically ∼300 km high. They are observed as changes in ionospheric total electron content (TEC), number of electrons along the line-of-sights connecting GNSS receivers and satellites. Since its first observation by Calais and Minster (1995) with Global Positioning System (GPS), the oldest GNSS, lots of coseismic ionospheric disturbances have been reported using the GNSS-TEC technique (e.g.

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Atmospheric modes excited by the 2021 August eruption of the Fukutoku-Okanoba volcano, Izu–Bonin Arc, observed as harmonic TEC oscillations by QZSS

Cited by 25 publications

References 13 publications

Ionospheric signatures of repeated passages of atmospheric waves by the 2022 Jan. 15 Hunga Tonga-Hunga Ha’apai eruption detected by QZSS-TEC observations in Japan

Ionospheric signatures of repeated passages of atmospheric waves by the 2022 Jan. 15 Hunga Tonga-Hunga Ha’apai eruption detected by QZSS-TEC observations in Japan

Disturbances in the Doppler frequency shift of ionospheric signal and in telluric current caused by the atmospheric waves from an explosive eruption of Hunga Tonga volcano on January 15, 2022

Slow Fault Slip Signatures in Coseismic Ionospheric Disturbances

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