Institut de Physique du Globe de Paris

The position is based in the Institut de Physique du Globe de Paris (IPGP, Paris, France), a world-renowned geosciences organisation. Bringing together more than 500 people, the IPGP studies the Earth and the planets from the core to the most superficial fluid envelopes, through observation, experimentation and modelling. The IPGP hosts powerful computing resources and state-of-the-art experimental and analytical facilities and benefits from first-class technical support. The IPGP pro-vides its students with geosciences training that combine observation, quantitative analysis and modelling, and that reflects the quality, richness and thematic diversity of the research conducted by the IPGP teams.

Homepage: https://www.ipgp.fr/

Phreatic eruptions do not necessarily involve the ascent of new magma to the surface, and often occur with minimal identification of unrest signals or warnings. Nevertheless, they can eject rocks and ash into the air and, in some cases, trigger pyroclastic density flows. Volcanoes with large hy-drothermal systems commonly experience phreatic and phreato-magmatic eruptions before larger magmatic eruptions. Despite growing awareness of the high risk associated with phreatic eruptions, many aspects of the processes leading to such events remain poorly understood. This PhD project is part of an ANR-funded initiative aimed at understanding the mechanisms driving phreatic and phreatomagmatic eruptions at Copahue Volcano (Patagonia). Copahue has been one of the most active volcanoes of the region in the past 30 years, and is considered by the Argentine Observato-ry of Volcanic Surveillance (OAVV of SEGEMAR) to pose the highest risk out of 39 active volcanos in the country.

The successful PhD candidate will study ash deposits from recent eruptions to quantify the relative contributions of magmatic and hydrothermal sources, and analyse their temporal evolution. He/she will perform numerical simulations of fluid and heat flow in the hydrothermal system to determine whether the recurrent eruptions at Copahue Volcano can be driven by sealing of the hydrothermal system, seasonal variations of precipitation and lake size, and/or magmatic fluid flux variations. The position is scheduled to start in October 2025. It is fully funded for 3 years. The project includes fieldwork at Copahue Volcano, and active collaborations and a research stay in OAVV.

We are looking for candidates with previous experience, or strong motivation in, numerical simula-tions, petrological analyses, fieldwork, and integrating numerical and laboratory results. The candi-date will also have interest to interact with the OAVV and the multi-disciplinary team of the ANR pro-ject.

To apply please send a CV, cover letter, and contact details of two references to Marina Rosas-Carbajal (rosas@ipgp.fr) and Fidel Costa (costa@ipgp.fr). The application deadline is April 15.