Detection, Classification, and Location of Seismovolcanic Signals with Multicomponent Seismic Data: Example from the Piton de La Fournaise Volcano (La Réunion, France)

Journeau, Cyril; Shapiro, N. M.; Seydoux, Léonard; Soubestre, Jean; Ferrazzini, Valérie; Peltier, Aline

doi:10.1029/2019jb019333

Cited by 23 publications

(36 citation statements)

References 41 publications

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“…The signs of continuous seismic tremor at frequencies between 0.5 and 5 Hz provide evidence that magma is at or very close to the surface (e.g., Chouet, 1996). Eruption tremor is a continuous ground vibration that has been systematically recorded during eruptions at Piton de la Fournaise (e.g., Battaglia et al, 2005;Journeau et al, 2020). Tremor first appeared on the OVPF seismic network around 08:20 UTC on 2 April (Figs.…”

Section: The Eruptionmentioning

confidence: 98%

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Peltier

Ferrazzini

Muro

et al. 2020

Seismological Research Letters

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In March 2020, the coronavirus disease 2019 outbreak was declared a pandemic by the World Health Organization and became a global health crisis. Authorities worldwide implemented lockdowns to restrict travel and social exchanges in a global effort to counter the pandemic. In France, and in French overseas departments, the lockdown was effective from 17 March to 11 May 2020. It was in this context that the 2–6 April 2020 eruption of Piton de la Fournaise (La Réunion Island, Indian Ocean) took place. Upon the announcement of the lockdown in France, a reduced activity plan was set up by the Institut de Physique du Globe de Paris, which manages the Observatoire Volcanologique du Piton de la Fournaise (OVPF). The aim was to (1) maintain remote monitoring operations by teleworking and (2) authorize fieldwork only for critical reasons, such as serious breakdowns of stations or transmission relays. This eruption provided an opportunity for the observatory to validate its capacity to manage a volcanic crisis with 100% remotely operated monitoring networks. We thus present the long- and short-term precursors to the eruption, and the evolution of the eruption recorded using the real-time monitoring data as communicated to the stakeholders. The data were from both continuously recording and transmitting field instruments as well as satellites. The volcano observatory staff remotely managed the volcano crisis with the various stakeholders based only on these remotely functioning networks. Monitoring duties were also assured in the absence of ad hoc field investigation of the eruption by observatory staff or face-to-face communications. The density and reliability of the OVPF networks, combined with satellite observations, allowed for trustworthy instrument-based monitoring of the eruption and continuity of the OVPF duties in issuing regular updates of volcanic activity in the context of a double crisis: volcanic and health.

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Section: The Eruptionmentioning

confidence: 98%

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Peltier

Ferrazzini

Muro

et al. 2020

Seismological Research Letters

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“…As it is often observed on volcanic edifices, seismic signals recorded in La Réunion are extremely diverse. In addition to local tectonic earthquakes and volcano-tectonic earthquakes (i.e., brittle failures triggered by magma intrusions), we can find many other types of signals such as volcanic tremor, long-period and very-longperiod events along with rockfalls of different sizes [Zecevic et al, 2013, Hibert et al, 2017, Battaglia et al, 2016, Hibert et al, 2017, Durand et al, 2018, Journeau et al, 2020.…”

Section: Introductionmentioning

confidence: 99%

Seismicity of La Réunion island

Duputel¹,

Ferrazzini²,

Lengliné³

et al. 2022

Comptes Rendus. Géoscience

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The island of La Réunion is made up of two main shield volcanoes: Piton des Neiges and Piton de la Fournaise. A wide variety of seismic events is observed, including but not limited to: tectonic events, volcano-tectonic earthquakes, volcanic tremors, long-period and very-long-period earthquakes. The seismicity of La Réunion island illuminates different levels of its volcanic plumbing system. In the shallowest part of Piton de la Fournaise, earthquakes are clustered below the volcano summit area and often occur as intense seismic swarms during magma intrusions. Seismic activity is also observed below the East flank of Piton de la Fournaise, shaping an eastward dipping structure possibly accommodating seaward displacements of the volcano. At larger depths, episodes of upward seismicity migrations indicate magmatic recharges of the shallow reservoir from deeper parts of the volcano plumbing system. Earthquakes are also observed below the oceanic crust in a zone of underplating between Piton des Neiges and Piton de la Fournaise. A major event at Piton de la Fournaise was the collapse of its summit caldera in April 2007. This activity resulting in a summital depression of 330 m was accompanied by very-long-period earthquakes with magnitudes ranging from M W = 4.4 to M W = 5.4. Another noticeable activity in La Réunion island is an active seismic swarm located within the oceanic crust under the North flank of Piton des Neiges. The origin of this sustained seismic activity is still unclear and is currently investigated, thanks to the deployments of additional stations in the region.

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“…The method we use to detect and locate volcanic tremor at Kīlauea is based on the seismic network covariance matrix (Seydoux, Shapiro, de Rosny, Brenguier, & Landes, 2016). By enhancing coherent signals within the network (in terms of phase) and reducing local noise contributions, this method enables the automatic detection (Seydoux, Shapiro, de Rosny, Brenguier, & Landes, 2016; Soubestre et al., 2018) and location (Journeau et al., 2020; Soubestre et al., 2019) of volcanic tremor.…”

Section: Methodsmentioning

confidence: 99%

Sources of Volcanic Tremor Associated With the Summit Caldera Collapse During the 2018 East Rift Eruption of Kīlauea Volcano, Hawai'i

Soubestre

Chouet²,

Dawson

2021

JGR Solid Earth

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The 2018 eruption of Kīlauea Volcano, Hawai'i was marked by dike intrusion and the production of voluminous lava flows in the lower east rift. Magma withdrawal from the summit region induced summit subsidence and triggered the draining of an active lava lake in Halema'uma'u Crater in Kīlauea Caldera. The surface of the lava lake started to drop on May 2, 2018 (Neal et al., 2018), synchronous with the onset of subsidence. Over the intervening week, the lava lake dropped more than 300 m, eventually vanishing from sight on May 10, 2018(Neal et al., 2018. Sustained magma withdrawal induced a drop of the floor of Halema'uma'u, which progressed in a series of semi-regular collapses starting on May 17, 2018. As the eruption continued over the next three months, surface collapse grew beyond Halema'uma'u to encompass large portions of the caldera to the east and west. A total of 62 collapse events occurred in the caldera up to Abstract Volcanic tremor occurring at the beginning of the 2018 Kīlauea eruption is characterized using both seismic and tilt data recorded at the Kīlauea summit. An automatic seismic network-based approach detects several types of tremor including (a) 0.5-1 Hz long-period tremor preceding the eruption, located at the south-southwest edge of Halema'uma'u Crater and attributed to the quasi-steady radiation from a shallow hydrothermal system and (b) two sequences of gliding tremor at the beginning of the eruption, both with locations on the edges of the crater and within it. The first sequence is attributed to two swarms of low-amplitude regularly repeating earthquakes induced by the jerky motions of a cylindrical rock piston with radius of 325 m, height of 250 m, and mass of 2.07 × 10 11 kg, progressively intruding 12.3 m into the shallow hydrothermal system with volume of 10 8 m 3 and depth extent of 300 m. The second sequence is attributed to a gradual evolution in the properties of a bubbly magma within an east-striking dike below Halema'uma'u Crater, impacted by repeated roof collapses. A fluid-filled crack model points to a decrease in gas volume fraction from 4.22% to 1.6 × 10 −2 % in the magma filling the dike, and a model of gas retro-diffusion within the melt suggests a two orders of magnitude decrease in bubble number density from 7 × 10 8 m −3 down to 4 × 10 6 m −3 . Both models feature a quasi to totally degassed magma by May 26.

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Detection, Classification, and Location of Seismovolcanic Signals with Multicomponent Seismic Data: Example from the Piton de La Fournaise Volcano (La Réunion, France)

Cited by 23 publications

References 41 publications

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown

Seismicity of La Réunion island

Sources of Volcanic Tremor Associated With the Summit Caldera Collapse During the 2018 East Rift Eruption of Kīlauea Volcano, Hawai'i

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