First Results from the UnderVolc High Resolution Seismic and GPS Network Deployed on Piton de la Fournaise Volcano

Brenguier, Florent; Kowalski, Philippe; Staudacher, Thomas; Ferrazzini, Valérie; Lauret, Fréderic; Boissier, Patrice; Catherine, Philippe; Lemarchand, Arnaud; Péquegnat, Catherine; Meric, Ombeline; Pardo, Constanza; Peltier, Aline; Tait, S.; Shapiro, N. M.; Campillo, Míchel; Muro, Andréa Di

doi:10.1785/gssrl.83.1.97

Cited by 53 publications

(49 citation statements)

References 16 publications

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“…This frequently active (i.e., 13 eruptions between June 2014 and July 2018; Table 1) basaltic volcano represents an excellent field laboratory that is monitored by a dense network of geodetic and seismological stations (see Figure 1; Brenguier et al, 2012;Staudacher & Peltier, 2016). This frequently active (i.e., 13 eruptions between June 2014 and July 2018; Table 1) basaltic volcano represents an excellent field laboratory that is monitored by a dense network of geodetic and seismological stations (see Figure 1; Brenguier et al, 2012;Staudacher & Peltier, 2016).…”

Section: Introductionmentioning

confidence: 99%

Constraining Spatiotemporal Characteristics of Magma Migration at Piton De La Fournaise Volcano From Pre‐eruptive Seismicity

Duputel

Lengliné

Ferrazzini

2019

Geophysical Research Letters

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Volcano‐tectonic seismicity has been recorded for decades on various volcanoes and is linked with the magma transport and reservoir pressurization. Yet earthquakes often appear broadly distributed such that magma movement is difficult to infer from its analysis. We explore the seismicity that occurred before eruptions at Piton de la Fournaise in the last 5 years. Using template matching and relocation techniques, we produce a refined image of the summit seismicity, demonstrating that most earthquakes are located on a ring structure. However, only a portion of this structure is activated before each eruption, which provides an indication as to the direction of the future eruptive site. Furthermore, we show that the delay between the pre‐eruptive swarm and the eruption onset is proportional to the distance of the eruptive fissures relative to the summit cone. This reveals that the beginning of the intrusion already bears information regarding the future eruption location.

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Section: Introductionmentioning

confidence: 99%

Constraining Spatiotemporal Characteristics of Magma Migration at Piton De La Fournaise Volcano From Pre‐eruptive Seismicity

Duputel

Lengliné

Ferrazzini

2019

Geophysical Research Letters

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“…It was set up using stations placed at the coordinates of the UnderVolc network on Piton de la Fournaise volcano, Réunion Island, France (Brenguier et al, 2012), and a uniform target grid with 250 m node spacing. We used time grids calculated through the Prono et al…”

Section: Migrationmentioning

confidence: 99%

“…In order to monitor the volcanic activity and better understand the processes that occur in the edifice, 15 broadband seismic stations were installed in the framework of the UnderVolc project ( , Brenguier et al, 2012 in addition to the 6 already set up by the Volcanological Observatory of Piton de la Fournaise (OVPF). Given the relatively steep topography of the volcano, the seismic network is effectively 3D, which partially compensates the disadvantages of using only P-wave information to locate seismic events.…”

Section: Detection and Locationmentioning

confidence: 99%

“…This work has been supported by Agence Nationale de la Recherche (ANR) (France) under contract ANR-08-RISK-011 (UnderVolc). More detailed information on data can be found in Brenguier et al (2012). Data from the UnderVolc experiment will be freely available from www.resif.fr/portal (last accessed December 2013).…”

Section: Data and Resourcesmentioning

confidence: 99%

“…In this paper we describe the Waveloc method in detail and apply it in the context of volcanic seismicity swarms, which, like aftershock sequences, produce large numbers of events closely grouped in both space and time. In this paper, we present results for 12 seismic swarms recorded at Piton de la Fournaise volcano by the UnderVolc project (Brenguier et al, 2012) between 2009 and 2011. For one of these swarms, that of 14 October 2010, we had access to manual picks and locations (Schmid, 2011) that we used to fine tune our method and evaluate its robustness and accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Continuous Kurtosis-Based Migration for Seismic Event Detection and Location, with Application to Piton de la Fournaise Volcano, La Reunion

Langet

Maggi

Michelini

et al. 2014

Bulletin of the Seismological Society of America

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We present an automatic earthquake detection and location technique based on migration of continuous waveform data. Data are preprocessed using a kurtosis estimator in order to enhance the first arrival information, then migrated onto a predefined search grid using precalculated P-wave travel times, and finally stacked. Local maxima in the resulting 4D space-time grid indicate the locations and origin times of seismic events. We applied our technique to earthquake swarms occurring on Piton de la Fournaise volcano, La Réunion, France. We located 5000 events from 12 different swarms that occurred between 2009 and 2011. Our automated locations are consistent with those performed using manual picks and indicate that the seismicity concentrates around sea level. Multiplet analysis of the detected events and subsequent double-difference relocation produce sharper images of the earthquake swarms. Our code, Waveloc, is released in open source.

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Cointrusive shear displacement by sill intrusion in a detachment: A numerical approach

Chaput

Pinel

Famin

et al. 2014

Geophys. Res. Lett.

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Sheared sills are observed at Piton des Neiges (the eroded basaltic volcano of La Réunion) and are a suspected cause of the coeruptive flank displacement of Piton de la Fournaise in 2007. We performed a 2-D numerical study to quantify the perturbation induced by sill injection within a volcanic edifice. Magma is considered as an inviscid and pressurized fluid injected in an initially stable edifice under gravity-controlled extension. Two cases of injection are tested, in an elastic homogeneous edifice or along a detachment controlled by a friction law. We show that sill injection induces tangential displacements. This effect is strongly increased when sills are emplaced along a detachment, producing extension behind the injection and potentially ending in a large-scale flank collapse. Sill injections can thus explain the cointrusive shear deformation observed at Piton des Neiges and the tangential displacements measured at Piton de la Fournaise in 2007.

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First Results from the UnderVolc High Resolution Seismic and GPS Network Deployed on Piton de la Fournaise Volcano

Cited by 53 publications

References 16 publications

Constraining Spatiotemporal Characteristics of Magma Migration at Piton De La Fournaise Volcano From Pre‐eruptive Seismicity

Constraining Spatiotemporal Characteristics of Magma Migration at Piton De La Fournaise Volcano From Pre‐eruptive Seismicity

Continuous Kurtosis-Based Migration for Seismic Event Detection and Location, with Application to Piton de la Fournaise Volcano, La Reunion

Cointrusive shear displacement by sill intrusion in a detachment: A numerical approach

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