Publications
La fréquentation touristique et ses effets économiques : des enjeux pour des politiques de gestion et de valorisation de sites naturels patrimoniaux
Tourist spending at the UNESCO-listed Chaîne des Puys - Limagne fault tectonic arena significantly outweighs that of excursionists, with accommodation costs dominating overall expenditures. While tourists contribute 74% to paid activities, excursionists still represent a substantial 26%, offering a more evenly distributed economic resource throughout the year. The study introduces an analytic framework to quantify and qualify tourist frequentation, visitor expenses, and local economic impacts, addressing methodological challenges in monitoring open, extended sites. By combining diverse data sources with face-to-face surveys, researchers reveal insights into visitor motivations, practices, and the broader tourism system linked to the site, providing critical guidance for sustainable management and valorization policies.
The UNESCO World Heritage Site of the Chaîne des Puys–Limagne Fault Tectonic Arena (Auvergne, France)
The Chaîne des Puys–Limagne fault tectonic arena, inscribed as a UNESCO World Heritage Site in 2018, serves as a natural scale model illustrating continental rift processes. This site uniquely combines the Limagne fault (a graben border), the granitic Plateau des Dômes with its Quaternary volcanic alignment (Chaîne des Puys), and an inverted relief from Pliocene lava flow erosion (Montagne de la Serre). The study highlights how these structural and volcanic features, when viewed globally, provide a tangible understanding of deep tectonic dynamics. As an inhabited environment supporting 30,000 residents with traditional agroforestry practices, the site now faces the challenge of balancing conservation, sustainable development, and international recognition post-inscription.
Lake Chauvet Maar in the Chaîne des Puys Volcano Group, Central France
The Chaîne des Puys - Limagne fault tectonic arena, located in central France, features the Lake Chauvet Maar, a volcanic crater formed approximately 10,000 years ago during the end of the last glacial period. This maar, with a diameter of 600 meters and a depth of 73 meters, is part of a larger group of about 100 scoria cones, maars, and lava domes that stretch along the western edge of the Limagne graben, a rift valley formed by the Alpine orogeny starting in the late Mesozoic era. The study highlights the geological significance of this region, which has experienced volcanic activity extending into the Quaternary period, with the most recent eruption dated to around 7,000 years ago at Lake Pavin Maar, located nearby.
Development of a New Type of Geodiversity System for the Scoria Cones of the Chaîne des Puys Based on Geomorphometric Studies
A new geodiversity system for scoria cones, developed through geomorphometric studies of the Chaîne des Puys UNESCO World Heritage site, addresses a critical limitation in existing methods. Traditional geodiversity indices often underestimate the aesthetic and scientific value of symmetrical volcanic features like scoria cones due to their regular shapes. The proposed approach modifies these indices by adapting them to cone geometry, enhancing the representation of uniformity and symmetry in larger landscape elements. This method is computationally simple yet effective, applicable to thousands of monogenetic volcanoes globally and extendable to other volcanic features such as domes or even larger volcanoes. It bridges the gap between scientific quantification and aesthetic appreciation, offering a robust tool for analyzing geodiversity in volcanic landscapes.
DTM-Based Morphometric Analysis of Scoria Cones of the Chaîne des Puys (France)—The Classic and a New Approach
A novel sectorial approach to analyzing scoria cones in the Chaîne des Puys (France) reveals that most cones exhibit asymmetry and elongation, with lithology influencing shape more than age. This DTM-based morphometric study contrasts classic descriptors with detailed slope distributions, uncovering systematic trends in cone symmetry and morphology. While regression models show partial success in linking parameters to age, further research is needed to fully understand the relationship between lithology, shape, and symmetry.
L’usage des trachytes de la chaîne des Puys depuis deux millénaires / The use of trachytic lava in the chaîne des Puys for two millennia
A groundbreaking study reveals that trachytic lavas from the Chaîne des Puys volcanoes exhibit unique petrographic identities, enabling precise sourcing of archaeological materials. The research, part of a collective project, identified distinct lava types for most volcanoes, with exceptions like Cliersou and Aumône sharing the same composition. Notably, the Puy de Dôme and Cratère Kilian each consist of two different lavas. This fine characterization allows archaeologists to trace trachyte materials used in ancient buildings, tombs, and sculptures—such as those from the Temple of Mercury and the Tourette d'Enval sanctuary—to their original volcanic sources. The study also uncovered extensive quarrying activities during antiquity and the High Middle Ages, including previously unknown underground exploitations. Additionally, it highlights the use of trachytes in Romanesque architecture and modern civil construction, offering new insights into ancient economic circuits and craft practices.
Robust Bayesian Joint Inversion of Gravimetric and Muographic Data for the Density Imaging of the Puy de Dôme Volcano (France)
Scientists have successfully created the most precise 3D density image of the Puy de Dôme volcano, revealing it to be dry and permeable with a dense trachytic core. This groundbreaking achievement was accomplished by jointly inverting gravimetric and muographic data using a robust Bayesian method, which automatically adjusts for data-specific artifacts and potential density offsets. The approach overcomes limitations of traditional methods, such as the non-uniqueness of solutions in gravimetry and the geometric constraints of muography. By combining these techniques, researchers have gained deeper insights into the volcano's internal structure, improving our understanding of magma pathways and structural weaknesses.
Rheological change and degassing during a trachytic Vulcanian eruption at Kilian Volcano, Chaîne des Puys, France
Trachytic magmas, such as those erupted at Kilian Volcano in France's Chaîne des Puys, exhibit unique rheological behaviors that influence effusive-explosive transitions during Vulcanian eruptions. This study reveals that trachytes can erupt explosively at higher ascent rates than more evolved subalkaline dacitic or rhyolitic magmas due to their distinct properties: high water solubility and diffusivity, rapid microlite growth, and lower melt viscosity. The research combines chemical and textural analyses of tephra with viscosity models to demonstrate how effusive activity transitions to explosive phases through processes like volatile loss, crystallization, and pore space sealing. These findings suggest that the periodicity of eruptive styles in trachytic volcanoes may differ from better-studied andesitic or rhyolitic systems, with implications for volcanic hazard assessment.
Une association bryophytique nouvelle, endémique du puy de Dôme (Puy-de-Dôme, Auvergne-Rhône-Alpes) : le Gymnomitrio corallioidis-Barbilophozietum sudeticae
Researchers have identified a new, micro-endemic bryophyte association, the Gymnomitrio corallioidis-Barbilophozietum sudeticae, uniquely found on the summit of Puy de Dôme in the Chaîne des Puys. This permanent, pioneer community thrives on pulverulent domite outcrops amidst cryophilic heathlands and is characterized by species such as Gymnomitrion corallioides and Barbilophozia sudetica. The association, likely once more widespread, exhibits high sensitivity to climate change, raising concerns about its long-term survival on this relatively low-altitude summit. The study highlights the ecological significance of this specialized community within a UNESCO World Heritage Site.
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