I also invite you to visit my Google Scholar, ORCID and ResearchGate pages.
Published papers:
Auer, A., Walter, T.R., Ostorero, L., Belousov, A., Belousova, M., Balcone-Boissard, H., Boudon, G., Mania, R., Shevchenko, A. V. Effervescent fountaining—a transition between explosive and lava-dome forming eruptions: evidence from “boiling-over” pyroclastic flows from the March 2019 eruption of Bezymianny volcano, Kamchatka. Bulletin of Volcanology 87, 83 (2025). https://doi.org/10.1007/s00445-025-01868-3
"Boiling-over" activity is characterized by rapid magma volume expansion due to intense gas exsolution which is driving a frothed mass out of the vent leading to the formation of large but highly vesicular juvenile blocks. Such an eruption style is transitional between effusive (lava dome forming) and explosive activity, and we suggest a new term “effervescent fountaining” to replace the term “boiling over” as a more appropriate description of such an eruption.
Sternai, P., Pilia, S., Ghelichkhan, S., Bouilhol, P., Menant, A., Davies, D. R., Ostorero, L., Vaes, B., Esposito, R., Garzanti, E., Cloetingh, S., Gerya, T. Raising the roof of the world: a key role for intra-crustal mantle in supporting Tibet, Tectonics 44, e2025TC009057. https://doi.org/10.1029/2025TC009057
We propose that viscous underplating of Indian crust beneath Asian lithosphere, not crust, forms the overall architecture of the Himalayan-Tibetan orogen.
Ostorero, L., Esposito, R., Bouilhol, P., Ballato, P., Müller, V. A., Frezzotti, M. L., Sternai, P. Iranian Neo-Tethyan magmas as a significant CO2 source during the Middle Eocene Climate Optimum. Lithos 514-515, 108216 (2025). https://doi.org/10.1016/j.lithos.2025.108216
We conducted the first direct measurements of CO2 in melt inclusions from Eocene Iranian lavas and found that the Iranian magmatic activity contributed to the Middle Eocene Climatic Optimum (MECO) aorund 40.5 kyrs, providing the first volatile-based validation of this hypothesis.
Dupont De Dinechin, M., Ostorero, L., Balcone-Boissard, H., Boudon, G., Belousov, A., Belousova, M., Costa, F. A multi-mineral approach to decipher pre-eruptive magma dynamics: the 2010 eruption of Kizimen (Kamchatka, Russia). Submitted to Contributions to Mineralogy and Petrology. 180, 44 (2025). https://doi.org/10.1007/s00410-025-02222-8
We used a multimineral (plagioclase, orthopyroxene (Ostorero et al., 2022), and magnetite) approach and found that the compositional zoning plagioclase and magnetite crystals is consistent with the spatio-temporal interpretations made from orthopyroxene crystals zoning and timescales (Dupont De Dinechin et al., 2025).
Ostorero, L., Boudon, G., Balcone-Boissard, H., Martel, C., Erdmann, S., Morgan, D. J., Belousov, A., Belousova, M., Davydova, V. O., d'Augustin, T. The 1956 eruption of Bezymianny volcano (Kamchatka). Part II - Magma dynamics and timescales from crystal records. Bulletin of Volcanology 87, 19 (2025). https://doi.org/10.1007/s00445-024-01792-y.
We found that magma dynamics occurred a few months to twelve years before the major flank collapse and lateral blast of the 1956 eruption of Bezymianny (Kamchatka).
Martel, C., Erdmann, S., Boudon, G., Balcone-Boissard, H., Ostorero, L., d'Augustin, T., Belousov, A., Belousova, M., Davydova, V. O., Shcherbakov, V. D. The 1956 eruption of Bezymianny volcano (Kamchatka) —part I: petrological constraints on magma storage and eruptive dynamics. Bulletin of Volcanology 87, 18 (2025). https://doi.org/10.1007/s00445-025-01802-7.
We identified a three-level magma storage below Bezymianny: a deep reservoir (≥ 200–350 MPa, ≥ 840 °C), a shallow reservoir (50–100 MPa, 850–900 °C) in which the pre-cryptodome magma resided and from which the post-blast pumiceous magma originated, and a subsurface cryptodome (< 25 MPa, ~ 900 °C) from which the blast was initiated.
Ostorero, L., Balcone-Boissard, H., Boudon, G., Shapiro, N. M., Belousov, A., Belousova, M., Auer, A., Senyukov,
S. L., Droznina, S. Y (2022). Correlated petrology and seismicity indicate rapid magma accumulation prior to eruption of Kizimen volcano, Kamchatka. Commun Earth Environ 3, 290. 10.1038/s43247-022-00622-3.
We found a correlation between diffusive timescales in orthopyroxenes and seismic signals before the recent eruption of 2010 of Kizimen (Kamchatka), with a magmatic reactivation beginning 1.5 years before the eruption.
Ostorero, L., Boudon, G., Balcone-Boissard, H., Morgan, D. J., d’Augustin, T., Solaro, C (2021). Time-window into the transcrustal plumbing system dynamics of Dominica (Lesser Antilles). Scientific Reports 11, 11440. 10.1038/s41598-021-90831-1.
We found that interactions between 2 magmatic environments began 10-30 years before 4 pumiceous eruptions (last 24 kyrs) of a volcano in Dominica and then more dynamically in the last 2 years prior eruption.
Solaro, C., Balcone-Boissard, H., Morgan, D. J., Boudon, G., Martel, C., and Ostorero, L. (2020). A System Dynamics
Approach to Understanding the Deep Magma Plumbing System Beneath Dominica (Lesser Antilles). Frontiers in Earth Science 8, 574032. 10.3389/feart.2020.574032.
We found that two magma batches partially mixed at depth, one decade or more before two pumiceous eruptions (51 and 33 ka) of the same volcano as Ostorero et al. (2021).
OUTREACH
Article in the Lave journal
Summary of my studies of my PhD on Kamchatka volcanoes on the 1956 eruption of Bezymianny and the 2010 eruption of Kizimen. Available on this link: http://lave-volcans.com/lave_gp/index.php?action=072&ar=9 [in French]. Lave n°214 (2024).
Focus on my PhD in the annual report of the Institut de physique du globe de Paris (IPGP, France)
Corrélation entre réajustements du réservoir magmatique et signes précurseurs en surface : vers une horloge pré-éruptive (2022).
Scientific brief
Description of the results of our paper Ostorero et al. (2022) on the correlation between a seismic pre-eruptive crises and diffusion timescales from the 2010 Kizimen eruption. https://www.insu.cnrs.fr/fr/cnrsinfo/nouvelles-avancees-sur-la-dynamique-pre-eruptive-des-reservoirs-magmatiques (2022).
Scientific brief
Description of the results of our paper Ostorero et al. (2021) on spatio-temporal magma dynamics before Dominica's eruptions. https://www.insu.cnrs.fr/fr/cnrsinfo/les-orthopyroxenes-revelateurs-de-la-dynamique-des-zones-de-stockage-des-magmas-en (2021).
Documentary
Participation to the documentary "Au cœur de la Terre et des planètes - Episode 1 : Grands séismes et volcanologie" on Science et Vie TV (2021).
Geology Video
Les cailloux confinés. (2020). Caillou confiné (61) : projections volcaniques : des scories d'Islande par Léa Ostorero. Youtube. https://www.youtube.com/watch?v=U4UMPs_JB20&t=76s
SELECTED PRESENTATIONS
Invited seminars
October 2025 - CONVERSE Emerging Researcher Fall 2025 Webinar Series [online]. A Multimineral Approach to Decipher Pre-eruptive Magma Dynamics: The Case of the 2010 Eruption of Kizimen (Kamchatka, Russia).
2024-2025 - Main organizer of the GMPV seminar series (Geochemistry, Mineralogy, Petrology and Volcanology) at the University of Milano-Bicocca (one seminar once a month).
October 2023 - CRPG, Nancy, France - Seminar to the Magma group on Crystals records, from magma dynamics before eruptions to climatic impacts.
Seminars
February 2025 - Visit and seminars at ISTeP and CEREGE (France) - Seminars on my research "Crystals records: From chronometers before eruptions to climatic impacts".
Conferences
July 2025 - IAVCEI Scientific Assembly (Geneva, Switzerland). Main convener of Session 1.2 on Pre-eruptive timescales prior eruptions and co-convener of session 3.2 on the evolution of magmas in plumbing systems. Posters: CO2 budget of Eocene Iranian magmas and their potential contribution to the Middle Eocene Climatic Optimum and a second one on Magma storage, pre-eruptive dynamics and timescales of the 1956 eruption of Bezymianny volcano (Kamchatka, Russia).
June 2025 - Rencontre Scientifique Volcanologique (Chambéry, France). Poster: CO2 budget of Eocene Iranian magmas and their potential contribution to the Middle Eocene Climatic Optimum.
November 2024 - Workshop on the Volcanic halogens across the earth system: from magma to atmosphere (Orléans, France). Talk on the CO2 budget of Neo-Tethyan magmas from Iran and their potential contribution to the Middle Eocene Climatic Optimum.
April 2024 - EGU (Vienna, Austria) - Highlighted talk on the quantification of the pre-eruptive CO2 budget of Neo-Tethyan magmas and their forcing on Early Cenozoic global climate. 10.5194/egusphere-egu24-777. As well as a poster on Diffuse CO2 degassing monitoring of the Tenerife North-South Rift Zone (NSRZ) volcano, Canary Islands. 10.5194/egusphere-egu24-13196
September 2023 - Topo Europe meeting (Sopron, Hungary) - Poster on the Pre-eruptive CO2 budget of lower Cenozoic Neo-Tethyan magmas.
July 2023 - Goldschmidt (Lyon, France) - Posters on the Pre-eruptive CO2 budget of lower Cenozoic Neo-Tethyan magmas - 10.7185/gold2023.19837/Pre-eruptive architecture and reactivation timescales prior to the 1956 climactic eruption of Bezymianny volcano (Kamchatka, Russia) - 10.7185/gold2023.19371.
February 2023 - IAVCEI Scientific Assembly (New Zealand) - Talk and poster, Presentations on the pre-eruptive magma dynamics prior to the 2010 and 1956 eruptions of Kizimen and Bezymianny volcano, respectively.
Nov 2021 - RST (Lyon, France) - Talk, Early-warning clock at Kizimen (Kamchatka) by correlating diffusive timescales with seismic data. sciencesconf.org:rst2020-lyon:331098
July 2021 - Online Goldschmidt - Talk, Insights into the pre-eruptive spatiotemporal magma dynamics of the last eruption of Kizimen (Kamchatka, Russia). 10.7185/gold2021.5967
April 2021 - Online EGU - Talk, Time-window into the transcrustal plumbing system dynamics of Dominica (Lesser Antilles). 10.5194/egusphere-egu21-2797