Publications
Distribution and cover of a recently introduced alien sedge species, Carex pilulifera L., in the subalpine vegetation of Reunion Island
A recent study identifies Carex pilulifera L., a European sedge, as an invasive species in Reunion Island's subalpine vegetation, with significant presence (16.6% cover) only on Piton de la Fournaise but potential for spread to Piton des Neiges. The species thrives near grazing and fodder areas, suggesting these as likely introduction pathways. Using generalized linear models (GLMs) and species distribution models (SDM), researchers found C. pilulifera to be the fourth most observed alien plant, predominantly in subalpine grasslands. The study highlights its invasive potential in high-biodiversity regions and recommends targeted management, including surveys in Piton des Neiges and control measures in Piton de la Fournaise to prevent further spread.
22 years of satellite imagery reveal a major destabilization structure at Piton de la Fournaise
A major destabilization structure at Piton de la Fournaise, capable of triggering catastrophic volcanic collapses, has been identified through 22 years of satellite imagery analysis. This spoon-shaped structure, characterized by a continuum of displacement from no slip to sheared sills and pure slip, connects arcuate dyke intrusions at depth with sill intrusions transitioning into a fault zone toward the sea. The study highlights how repeated magmatic intrusions into this structure could lead to significant flank failures, posing risks of large earthquakes and tsunamis. Researchers used inverse modeling to map 57 intrusive events between 1998 and 2020, shedding light on the complex interplay between dyke and sill intrusions and their role in volcanic instability.
Multitechnique Geochronology of Intrusive and Explosive Activity on Piton des Neiges Volcano, Réunion Island
A groundbreaking multitechnique geochronology approach has revolutionized our understanding of the geological history of Piton des Neiges, Réunion Island's main volcano. Researchers successfully dated major plutonic, metamorphic, and explosive events that were previously elusive, revealing four distinct stages of activity at 2,200–2,000 ka, 1,414 ± 8 ka, 665 ± 78 ka, and 150–110 ka. Notably, the study pinpointed a major Plinian eruption to 188.2 ± 10.4 ka, coinciding with caldera formation, and revised the last eruption date to 27 ka from an earlier estimate of 12 ka. This innovative method, combining zircon U-Pb, phlogopite 40Ar/39Ar, and (U-Th)/He dating techniques, demonstrates the efficacy of diversified approaches in accurately assessing volcanic activity timing, with significant implications for hazard prediction.
Reappraisal of gap analysis for effusive crises at Piton de la Fournaise
A reappraisal of the gap analysis for effusive crises at Piton de la Fournaise reveals that the volcano's preparedness and response capabilities are far more robust than previously assessed. Contrary to earlier findings by Tsang and Lindsay (2020), this study demonstrates that Piton de la Fournaise has minimal gaps in knowledge due to extensive peer-reviewed literature and comprehensive observatory reports. The research corrects methodological flaws in prior analyses, emphasizing the critical role of the Observatoire Volcanologique du Piton de la Fournaise (OVPF-IPGP) in documenting 81 eruptions since 1979. It advocates for rigorous, third-party reviews to ensure gap analyses are thorough and accurate, leveraging all available scientific and observational resources.
Structured elicitation of expert judgement in real-time eruption scenarios
A structured expert elicitation exercise conducted remotely for Piton de la Fournaise volcano, La Réunion, revealed that an uncommon effusive eruption scenario—with a vent outside the caldera and within inhabited areas—would likely present distinct characteristics compared to recent eruptions. Involving 28 experts from nine countries, this study demonstrated the feasibility of tele-elicitation for volcanic crisis management, providing critical uncertainty ranges for hazard-related questions such as eruption probability and lava flow timing. The findings underscore the importance of integrating well-prepared expert elicitations into civil protection evacuation plans to enhance disaster response procedures.
Volcanic crisis management supported by near real-time lava flow hazard assessment at Piton de la Fournaise, La Réunion
A near real-time lava flow hazard assessment protocol, implemented at Piton de la Fournaise (La Réunion) since 2018, significantly enhances volcanic crisis management by providing rapid, discharge-rate-dependent hazard maps. These maps, shared with civil protection within hours of an eruption, improve mitigation strategies through iterative collaboration between scientists and authorities. The study demonstrates how this integrated satellite data-driven approach tailors hazard assessments to local needs, addressing gaps in real-time decision-making during effusive crises.
Lava flow hazard map of Piton de la Fournaise volcano
Piton de la Fournaise, one of the world's most active basaltic shield volcanoes on La Réunion island, poses significant lava flow hazards, particularly outside its uninhabited Enclos caldera. A new study presents an up-to-date lava flow hazard map for the volcano, highlighting that while the majority of eruptions (95%) occur within the Enclos—visited by over 100,000 people annually—the probability of future lava flows remains low (< 0.1%) in inhabited areas outside this region. The map, based on vent distribution, recurrence times, lava flow statistics, and simulations using the DOWNFLOW model, indicates up to 12% inundation probability within the Enclos but only 0.5% along active rift zones outside it. However, the study acknowledges potential underestimation due to limited historical records and suggests that atypical large-volume eruptions could pose greater risks than currently modeled. Regular updates of digital elevation models (DEMs) are recommended to maintain accurate hazard assessments for land use planning and risk mitigation.
Detection, Classification, and Location of Seismovolcanic Signals with Multicomponent Seismic Data: Example from the Piton de La Fournaise Volcano (La Réunion, France)
Researchers developed three innovative methods to detect, classify, and locate seismovolcanic signals using multicomponent seismic data from the Piton de La Fournaise volcano. These methods efficiently identified tremors linked to the 2010 eruptions and preceding seismic swarms, revealing distinct regions of volcanic activity close to the eruptive site at shallow depths and deeper seismic crises near sea level under the summit crater. The study demonstrates that network-based approaches, particularly those analyzing covariance matrix distributions and backprojecting interstation cross-correlations, significantly enhance the detection and localization of volcanic earthquakes.
Machine Learning Reveals the Seismic Signature of Eruptive Behavior at Piton de la Fournaise Volcano
A groundbreaking study reveals distinct seismic signatures linked to eruptive dynamics at Piton de la Fournaise Volcano. Using machine learning on six years of continuous seismic data, researchers identified patterns associated with high-volume lava effusion and vent closure during eruptions in 2015 and 2018. This approach offers new insights into the temporal and spatial evolution of volcanic activity, potentially transforming our understanding of eruptive behavior. The methodology is adaptable to other active volcanoes, promising broader applications for volcanic hazard assessment.
Magma fragmentation and particle size distributions in low intensity mafic explosions: the July/August 2015 Piton de la Fournaise eruption
Low-intensity mafic explosions, often overlooked but frequent and hazardous, were studied during the July/August 2015 eruption of Piton de la Fournaise. The research revealed that surface tension instabilities and inertial forces drive magma fragmentation, producing coarse-skewed particle size distributions with median diameters ranging from -8 to -10 ϕ. Over time, these distributions shifted toward more symmetrical shapes as grain sizes became finer due to in-flight fragmentation of magma droplets. The study combined visual and thermal documentation with sample analysis to elucidate the dynamics of magma fragmentation and its implications for vent-proximal hazard assessment.
Paroxysmal eruptions tracked by variations of helium isotopes: inferences from Piton de la Fournaise (La Réunion island)
Helium isotopes (³He/⁴He) serve as a critical indicator of mantle dynamics and volcanic activity, offering potential warnings for paroxysmal eruptions. A study on Piton de la Fournaise volcano in La Réunion revealed that the highest enrichment in primordial helium (³He) correlates with the most voluminous eruptions, including caldera collapse events. This suggests a greater contribution of primitive mantle plume components during such eruptions. The research compared ³He/⁴He signatures in volcanic gases and fluid inclusions from 1990 to 2017, demonstrating analogous temporal variations even within the same eruption. These findings highlight helium isotopes as early markers for increased deep magmatic contributions, with implications for volcanic hazard assessment, as seen in both Piton de la Fournaise (2007) and Kilauea (2018).
The role of Interferometric Synthetic Aperture Radar in Detecting, Mapping, Monitoring, and Modelling the Volcanic Activity of Piton de la Fournaise, La Réunion: A Review
Interferometric Synthetic Aperture Radar (InSAR) has provided groundbreaking insights into the volcanic activity of Piton de la Fournaise, La Réunion, revealing the previously suspected mobility of its unsupported eastern flank and offering a powerful tool for detecting eruption-related displacements in remote areas. This review synthesizes key findings from two decades of InSAR data, highlighting its role in mapping subsurface magmatic processes, volcanic edifice architecture, and eruptive behavior despite challenges like dense vegetation and atmospheric interference. While multitemporal approaches and advanced techniques are improving data handling, frequent eruptions remain a hurdle. The study underscores the growing importance of InSAR as an operational tool for monitoring highly active volcanoes globally.
Volcano Crisis Management at Piton de la Fournaise (La Réunion) during the COVID-19 Lockdown
During the COVID-19 lockdown, Piton de la Fournaise volcano's eruption (2–6 April 2020) demonstrated the feasibility of managing volcanic crises entirely through remote monitoring. The Observatoire Volcanologique du Piton de la Fournaise (OVPF) successfully maintained real-time data collection and stakeholder communication using teleworking, satellite observations, and field instruments without physical access to the site. This validated the robustness of its monitoring networks during a double crisis—volcanic activity and pandemic restrictions—highlighting the potential for remote volcanic surveillance in future emergencies.
Magma interactions, crystal mush formation, timescales, and unrest during caldera collapse and lateral eruption at ocean island basaltic volcanoes (Piton de la Fournaise, La Réunion)
A study of Piton de la Fournaise volcano reveals that magma interactions and crystal mush formation during caldera collapse and lateral eruptions differ significantly from other mafic ocean island volcanoes. The research, using olivine crystal compositions and melt inclusions, shows that the 2007 eruption was driven by rapid magma crystallization at shallow depths without significant magma mixing. Geophysical data indicated that magma intrusion began approximately a month before the eruption, migrating from ~3 km below sea level to about 1 km above sea level. The chemical zoning of olivine crystals suggests lateral movement of crystal mush towards the surface within days to months. Post-caldera samples also showed significant hydrogen loss due to depressurization. These findings contrast with other volcanoes like Kilauea and Etna, where magma mixing is more common, and are attributed to variations in magma supply rates from depth.
Magma Propagation at Piton de la Fournaise From Joint Inversion of InSAR and GNSS
A study of Piton de la Fournaise volcano (La Réunion, France) reveals that the 26 May 2016 eruption was fed by a single batch of magma quickly disconnected from its source. The research, combining InSAR and GNSS data with advanced modeling techniques, identified a 2,700-meter-long sill located 800 meters above sea level, connected to the eruptive fissure by a subvertical dike. The intrusion stalled for approximately five hours before final upward propagation and eruption, suggesting limited magma supply. Two potential mechanisms—magmatic gas pressure or eastward flank slip—may have triggered the eruption.
New particle formation in the volcanic eruption plume of the Piton de la Fournaise: specific features from a long-term dataset
Volcanic eruption plumes significantly enhance new particle formation (NPF), a key atmospheric process influencing cloud condensation nuclei (CCN) concentrations. A long-term dataset from the Piton de la Fournaise volcano on La Réunion Island revealed NPF occurred on 90% of plume days compared to 71% of non-plume days, with higher particle formation rates and secondary particle dominance (93%) in volcanic conditions. The study also demonstrated that SO₂ mixing ratios alone can estimate nucleation rates, suggesting a critical role for H₂SO₄ in NPF. This research provides unprecedented insights into volcanic aerosol dynamics, offering valuable data for climate models to better define pre-industrial atmospheric conditions.
Validation of an integrated satellite-data-driven response to an effusive crisis: the April–May 2018 eruption of Piton de la Fournaise
An integrated satellite-data-driven approach effectively tracked lava flow projections during the April–May 2018 eruption of Piton de la Fournaise, demonstrating its potential for real-time volcanic crisis response. The study validated a protocol combining MIROVA for discharge rate (TADR), ASTER urgent response data delivery, DOWNFLOW for flow path projections, and PyFLOWGO for run-out estimates. Using 2018 eruption data, the system delivered accurate flow predictions with minimal latency, matching ground observations from InSAR and ASTER mapping. The protocol processed 35 TADRs and four InSAR image pairs over 35 days, proving its reliability in high-stakes volcanic monitoring scenarios.
Changes in the Long-Term Geophysical Eruptive Precursors at Piton de la Fournaise: Implications for the Response Management
A study of Piton de la Fournaise volcano reveals significant changes in long-term geophysical eruptive precursors, such as seismicity and ground displacements, which occur days to weeks before eruptions. These changes, observed between 1998 and 2017 (43 eruptions), are linked to the pre- and post-summit caldera formation in April 2007 and shifts in deep magma refilling processes since 2016. The research highlights the impact of these variations on early warning systems, leading to false or late alerts. This insight has prompted improvements in alert protocols and more effective communication between scientists and decision-makers, enhancing crisis management at the UNESCO World Heritage Site.
Constraining Spatiotemporal Characteristics of Magma Migration at Piton De La Fournaise Volcano From Pre‐eruptive Seismicity
Research at Piton de la Fournaise Volcano reveals that pre-eruptive seismicity occurs along a specific ring structure, with only a portion activated before each eruption. This activation pattern indicates the future direction of eruptive fissures. Additionally, the delay between the onset of seismic swarms and the actual eruption is proportional to the distance of the eruptive fissures from the summit cone, suggesting that early intrusion phases can predict eruption locations. The study used template matching and relocation techniques on five years of pre-eruptive seismicity data to produce a refined image of seismic activity, providing new insights into magma migration dynamics.
Integrating field, textural, and geochemical monitoring to track eruption triggers and dynamics: a case study from Piton de la Fournaise
A 2014 eruption at Piton de la Fournaise (PdF), La Réunion, revealed that shallow magma pockets can be rapidly reactivated by deep processes without significant mass or energy transfer, producing hazardous eruptions with minimal short-term precursors. The study integrated field observations, textural analyses of pyroclastic material, and geochemical monitoring to track eruption triggers and dynamics. It found that the eruption's small volume and brief duration were linked to a stratified magma storage system, where golden basaltic pumice and fluidal clasts represented hotter, less crystalline magma, while spiny scoria reflected cooler, more crystalline portions. Exponential decay in magma ascent rates indicated progressive reservoir depressurization, with syn-eruptive degassing leading to a shift from fountaining to Strombolian activity. Geochemical data confirmed the absence of new hot magma input, suggesting the 2014 eruption sourced residual magma from a previous 2009 event.
On the Link Between External Forcings and Slope Instabilities in the Piton de la Fournaise Summit Crater, Reunion Island
A study on the Piton de la Fournaise volcano (Reunion Island) reveals that renewed eruptive activity, combined with external factors like rain and seismicity, significantly increases rockfall volumes in the summit crater. Analyzing 10,477 rockfalls between 2014–2016, researchers found pre-eruptive seismic events trigger the largest collapses, often with a delay of days, while rain alone does not cause major instabilities. The findings suggest that repetitive seismic vibrations and rainfall accelerate crack growth in fractured materials, leading to large-scale collapses. Larger rockfalls also appear to migrate toward future magma extrusion sites before eruptions.
Effusive crises at Piton de la Fournaise 2014–2015: a review of a multi-national response model
A multi-national, near-real-time response system for volcanic hazard assessment has proven effective during the effusive crises at Piton de la Fournaise (La Réunion Island) between 2014 and 2015. This study demonstrates that integrating remote sensing, modeling, and field measurements across national and international networks significantly enhances the speed and accuracy of lava flow propagation assessments. The system, which evolved during five effusive crises, highlights the importance of dynamic, open collaboration in volcanic monitoring, particularly for isolated or distant observatories like Piton de la Fournaise, located 9365 km from its governing body. This approach not only improves hazard assessment but also underscores the potential for multi-national integration to revolutionize scientific response during ongoing volcanic events.
First results of the Piton de la Fournaise STRAP 2015 experiment: multidisciplinary tracking of a volcanic gas and aerosol plume
The STRAP 2015 campaign revealed that volcanic plumes from Piton de la Fournaise, even during weak eruptions, interact significantly with the island's surface, leading to strong concentrations of sulfur dioxide (SO2) and aerosols up to 20 km away. The study, conducted through a multidisciplinary collaboration between volcanologists and meteorologists, measured SO2, CO2, and H2O emissions, plume altitude, aerosol size distribution, and extinction profiles over four eruptive periods. It also documented cases of sulfuric acid nucleation within the plume and at distal sites like the Maïdo observatory. This comprehensive dataset provides critical insights for improving numerical models of volcanic plume behavior.
New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO 2 flux at Piton de la Fournaise (La Réunion Island, France)
A major deep magmatic event at Piton de la Fournaise volcano, La Réunion Island, was detected three months before the eruption through continuous soil CO₂ flux measurements (2013–2016). Despite tropical challenges like heavy rainfall, corrected and filtered data revealed magma transfer dynamics, validated by geophysical correlations. This study demonstrates that soil CO₂ monitoring in tropical environments is a robust tool for tracking volcanic unrest down to the lithospheric mantle, offering new perspectives for early eruption detection.
Tourism in the Fond Gens Libre Indigenous community in Saint Lucia
Fond Gens Libre, an indigenous community nestled at the foot of Saint Lucia's UNESCO-listed Pitons Management Area (PMA), faces significant challenges in poverty and limited livelihood opportunities despite its strategic location. This study highlights the community's historical significance as a descendant settlement of the Brigands since the 1700s, yet underscores its economic vulnerabilities within one of the Caribbean's few natural UNESCO World Heritage Sites. The research employs qualitative methods to explore tourism's potential role in addressing these challenges, offering insights into sustainable ethnodevelopment strategies for remote, culturally rich communities.
Body and surface wave reconstruction from seismic noise correlations between arrays at Piton de la Fournaise volcano
Researchers successfully reconstructed body and surface waves propagating through Piton de la Fournaise volcano using ambient seismic noise correlations. By applying double beamforming techniques between three dense geophone arrays, they isolated waves traveling through the active magmatic system, including direct, reflected, and multipathing signals. This approach also revealed the impact of uneven noise source distribution on wave reflections. The study demonstrates a novel method for enhancing volcano imaging and monitoring by leveraging ambient seismic noise, offering valuable insights into subsurface structures and processes.
Interrogating the ‘universal’ in St. Lucia’s Pitons Management Area
St. Lucia’s Pitons Management Area (PMA), inscribed as a UNESCO World Heritage Site in 2004, serves as a 'zone of contestation' where debates over national sovereignty, cultural and natural heritage, and economic development intersect. The study highlights that the PMA's universal significance is not universally accepted, with conflicts resurfacing due to intensified resort development in the Soufrière region. These tensions reflect broader patterns seen in World Heritage contexts, where local and global actors engage in contested mediation over history, culture, and economic strategies. The research approach involves analyzing these debates, drawing on theoretical frameworks that emphasize the socially and historically situated nature of such contestations.
Inversion of coeval shear and normal stress of Piton de la Fournaise flank displacement
A new method to invert quadrangular curved sources under simultaneous pressure and shear stress changes reveals that the posteruptive eastern flank displacement of Piton de la Fournaise is likely due to compaction and slow slip on a shallow detachment fault. This finding challenges the traditional view that flank displacement is solely induced by fault slip, suggesting instead that it may be linked to lithological discontinuities or sheared sills. The study analyzed data from six Envisat orbits over 14 months post-April 2007 eruption, identifying a large (5 km by 8 km) and shallow (500 m) trapezoidal fracture parallel to the flank. It also ruled out thermal contraction or degassing of a coeruptive sill as the primary cause, given the implausible dimensions and solidification time required.
Retrieving 65 years of volcano summit deformation from multitemporal structure from motion: The case of Piton de la Fournaise (La Réunion Island)
A groundbreaking study reveals that Piton de la Fournaise volcano (La Réunion Island) has experienced consistent summit volume growth at a rate of 2.2 million cubic meters per year from 1950 to 2015, with an acceleration to 8.0 million cubic meters per year preceding the major 2007 eruption. The research, leveraging multitemporal structure from motion photogrammetry, also identified asymmetric deformation, characterized by significant eastward seaward displacement (9.2 ± 2.5 m) and minimal westward movement (1.3 ± 2.5 m). These findings highlight the volcano's dynamic magma influx and long-term preferential eastern motion, crucial for mitigating risks associated with flank destabilization.
Seismic anisotropy and its precursory change before eruptions at Piton de la Fournaise volcano, La Réunion
Research at Piton de la Fournaise volcano, La Réunion, reveals that seismic anisotropy—measured through shear wave splitting—can serve as a precursor to eruptions. Fast directions of seismic waves align radially with the central cone and parallel to surface cracks, indicating stress-controlled crack formation. The study found that delay times in split shear waves tend to increase while surface wave velocities decrease before eruptions, correlating with GPS baseline changes. These variations suggest dynamic changes in crack density and fluid pressure. High Vp/Vs ratios under the summit compared to the flanks imply spatial differences in fluid-filled versus gas-filled cracks. The findings, derived from a combination of permanent and portable seismic networks, geodetic data, and ambient noise correlation analysis, offer a novel approach to monitoring volcanic activity with high temporal resolution.
Automated identification, location, and volume estimation of rockfalls at Piton de la Fournaise volcano
Researchers developed automated methods to identify, locate, and estimate the volume of rockfalls at Piton de la Fournaise volcano using seismic signals. These methods achieved a 92% success rate in discriminating rockfall events from other seismic activity and accurately located observed rockfalls within 100 meters. By analyzing seismic energy, they estimated rockfall volumes and identified the most hazardous areas of the volcano's summit. The study applied these techniques to over 12,400 rockfalls recorded between April 2007 and May 2011, providing critical insights for hazard assessment.
Dynamics of Piton de la Fournaise volcano observed by passive image interferometry with multiple references
A long-term increase in seismic velocities, averaging about 0.25% per year, has been identified at Piton de la Fournaise (PdF) volcano using passive image interferometry with multiple references. This trend is superimposed by short-term changes linked to summit seismo-tectonic earthquakes, indicating the influence of volcanic activity. Post-eruptive deflation periods show increased velocities associated with subsidence, while pre-eruptive inflation phases exhibit decreasing velocities. Seismic crises can correspond to either increasing or decreasing velocity depending on whether magma movement leads to deflation (due to eruption) or inflation (non-eruptive intrusion). The study suggests that these velocity changes reflect the dynamics of a shallow magma reservoir rather than surface eruptions, with the strongest effects observed in the central summit area. The research utilized 2010 and 2011 data from a network of 21 seismic stations to investigate these phenomena.
Long‐term dynamics of Piton de la Fournaise volcano from 13 years of seismic velocity change measurements and GPS observations
A nonlinear relationship between seismic velocity changes and volcanic deformation was identified at Piton de la Fournaise, with velocity decreases during inflation (2000–2007) and increases during deflation post-eruption. Researchers analyzed 13 years of seismic data from 30+ stations, measuring cross-correlation travel time delays to track velocity changes sensitive to depths of 100–2500 meters. These findings were compared with GPS-derived deformation data, revealing a two-order-of-magnitude discrepancy between the two metrics, suggesting complex interactions in volcanic dynamics.
The 2007 eruptions and caldera collapse of the Piton de la Fournaise volcano (La Réunion Island) from tilt analysis at a single very broadband seismic station
A single inflation-deflation cycle underpinned the three eruptions of Piton de la Fournaise volcano in 2007, revealing a complex interplay between magma intrusion and caldera collapse. Analysis of seismic tilt data from La Réunion Island's Geoscope station showed that the February summit eruption occurred during continuous inflation, which decelerated before the March eruption—a phase marked by sudden deflation. This deflation intensified without further eruptions, culminating in a major distal eruption on 2 April and a caldera collapse three days later. Long-term tilt trends suggest deep magma input triggered this sequence, offering new insights into volcanic processes linking surface activity to subsurface dynamics.
The Shallow Plumbing System of Piton de la Fournaise Volcano (La Reunion Island, Indian Ocean) Revealed by the Major 2007 Caldera-Forming Eruption
A major 2007 caldera-forming eruption at Piton de la Fournaise (La Réunion Island) revealed the volcano's shallow plumbing system, showing that a deep magma input triggered significant volcanic activity. The eruption expelled the largest recorded volume of magma in centuries (210 Mm³), with distinct geochemical and petrological signatures across eruptive phases. Pre-collapse magmas exhibited unique isotopic compositions, while post-collapse oceanite lavas dominated the erupted volume. The study proposes a new model where shallow sills host variable degassing, cooling, and crystallization, with deeper, hotter basaltic magma injections driving lateral draining and flank instability. Multistep ascent and water degassing were identified as key processes in fast magma crystallization at shallow depths.
Three‐dimensional shear velocity anisotropic model of Piton de la Fournaise Volcano (La Réunion Island) from ambient seismic noise
A three-dimensional shear velocity anisotropic model of Piton de la Fournaise Volcano (La Réunion Island) reveals distinct high-velocity anomalies beneath the volcano, likely linked to geological features such as an old intrusive body and a solidified magma chamber. The study used four years of seismic noise data from the volcanic network to measure Rayleigh and Love wave dispersion curves, which were then inverted into velocity maps. These maps identified three high-velocity anomalies, including one below the summit corresponding to the current dyke intrusion zone and another beneath the 'Grandes Pentes' and 'Grand Brûlé' areas, indicative of a dismantled volcanic structure. Radial anisotropy further highlighted the recent lava flow accumulation above sea level and ancient vertical dyke intrusions below sea level. This model provides critical insights into the volcano's internal structure and its evolutionary history.
Edifice strength and magma transfer modulation at Piton de la Fournaise volcano
Piton de la Fournaise volcano exhibits nonlinear magma transfer dynamics, where strain weakening during distal eruptions triggers horizontal magma movement and resets eruptive cycles. The study used Drücker-Prager elastoplastic rheology to model the volcanic edifice, revealing that friction angles shift from 15° during distal eruptions to >30° in interdistal periods, indicating plastic deformation in the eastern flank relaxes elastic stress. This challenges the linear elasticity paradigm, suggesting magma transfer discretization arises from the volcano's nonlinear response rather than supply changes alone.
Eruptive fracture location forecasts from high‐frequency events on Piton de la Fournaise Volcano
A new method for forecasting eruption locations on Piton de la Fournaise Volcano, a highly active basaltic volcano on La Réunion island, has been identified. Researchers discovered that high-frequency seismic events occurring during the quiescent period between volcano-tectonic swarms and eruptive tremors are strongly linked to future eruption sites. These shallow, short-duration events, lasting only a few hours, indicate the opening of magma pathways at shallow depths, even while magma is still propagating vertically. Unlike previous models that attributed such seismicity to direct magma pressure, this study suggests it reflects the volcano's generic response to stress perturbations, offering significant potential for improving short-term eruption location predictions. The findings are based on analysis of five eruptions between November 2009 and December 2010.
The politics of world heritage: a case study of the Pitons Management Area, St Lucia
The Pitons Management Area (PMA) in St. Lucia, inscribed as a UNESCO World Heritage Site, faces persistent challenges balancing conservation and development. A study analyzing media discourse revealed that while the inscription heightened the site's profile, political factors have overshadowed opportunities for sustainable management. The research, using content analysis of two leading newspapers, found a focus on addressing problems rather than leveraging benefits from the inscription. This highlights the primacy of politics in heritage management, with development quandaries persisting since the site's designation.
Eruption forerunners from multiparameter monitoring and application for eruptions time predictability (Piton de la Fournaise)
A groundbreaking study on Piton de la Fournaise volcano reveals that combining seismicity and deformation data significantly enhances eruption prediction accuracy, reducing false alarms. Researchers identified three distinct precursory patterns: a seismic velocity change 100–50 days before eruptions, a power-law increase in seismicity rate 15–10 days prior, and an abrupt rise in displacement on the eruption day. These findings suggest a three-step magma transfer mechanism toward the surface. By applying statistical methods to multiparameter monitoring data from 1999–2006, the study demonstrates that integrating deformation with seismicity data outperforms single-parameter predictions, offering a robust tool for decision-makers to optimize eruption prediction strategies based on risk levels.
Revue de la typologie des éruptions au Piton de La Fournaise, processus et risques volcaniques associés
A detailed analysis of the Piton de La Fournaise, a basaltic shield volcano on Réunion Island, reveals that while its overall dangerosity is relatively low, historical activity patterns demonstrate phases with potentially destructive eruptions. The study characterizes distinct eruption processes and assesses associated risks to human lives and infrastructure on the volcano's slopes. By synthesizing recent research, it provides insights into the volcanic dynamics that could inform risk management strategies for this UNESCO World Heritage Site.
Satellite-based evidence for a large hydrothermal system at Piton de la Fournaise volcano (Reunion Island)
A large hydrothermal system beneath Piton de la Fournaise volcano (Reunion Island) has been identified through satellite-based evidence. During the April 2007 eruption, a significant discrepancy was observed between sulfur dioxide (SO₂) emissions measured during the collapse phase of Dolomieu crater and those calculated from lava effusion rates. The excess SO₂, estimated at 935 ± 244 kilotons compared to 179 ± 89 kilotons from lava, suggests that the hydrothermal system was suddenly exposed by the crater's collapse. This finding provides critical insights into the volcano's magmatic evolution and eruptive behavior, contributing to our understanding of hydrothermal systems in volcanic regions.
PSInSAR as a new tool to monitor pre‐eruptive volcano ground deformation: Validation using GPS measurements on Piton de la Fournaise
A novel application of Permanent Scatterers Synthetic Aperture Radar Interferometry (PSInSAR™) demonstrates its potential as a highly precise tool for monitoring ground deformation in volcanic areas, particularly at Piton de la Fournaise. The study reveals two distinct zones of deformation: subsidence on the eastern flank due to old lava flows and significant activity at the summit cone, often preceding eruptions. PSInSAR-derived velocities align closely with continuous GPS (cGPS) measurements, capturing both long-term ground displacements (0.05–0.35 m/year) weeks or months before eruptions and rapid, large-scale movements during eruptive events. Despite challenges like signal loss during rapid deformation, the technique offers reliable, large-area monitoring of volcanic activity, as validated by this ESA Globvolcano project research.
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