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30/03/2026 09:45
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline experiment designed to resolve key questions in neutrino physics, including the neutrino mass ordering, by studying neutrinos produced by an accelerator beam and from natural sources (atmospheric, supernovas and solar). The sensitivity to the neutrino mass ordering from atmospheric neutrinos at DUNE can be...
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30/03/2026 09:57
Due to their unparalleled precision for measuring the properties of the massive black holes and testing general relativity, Extreme Mass Ratio Inspirals (EMRIs), which are composed of a massive black hole and a compact object, are one of the most promising sources of gravitational waves for space-based detectors such as the Laser Interferometer Space Antenna (LISA). The intricate nature of the...
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30/03/2026 10:10
-- I didn't look carefully enough at the dates, I teach on Tuesday 31st afternoon, so I would appreciate being put in another timeslot :) --
The study of very-high-energy (VHE) gamma-ray astrophysics opens a unique window into the most extreme phenomena in the Universe. This talk provides an overview of the challenges of detecting VHE gamma rays. Imaging Atmospheric Cherenkov Telescopes...
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30/03/2026 10:23
Strike-slip continental faults often show complex geometries, inherited from their past history. More particularly, they display branches, bends, and steps, also referred to as geometric asperities. Thus, far from being straight-lined, continental strike-slip faults are characterised by disconnected and misaligned sections, whose length and separating distance vary as the faults mature in...
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30/03/2026 10:36
Meteoroid impacts are a prominent class of lunar seismic sources in the Apollo record. Due to the strong scattering and low attenuation in the lunar crust, these hypervelocity near-surface sources generate waveforms dominated by long codas, producing emergent onsets that obscure body wave phases. Consequently, classical source location based on travel times from confident P and S picking is...
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30/03/2026 10:49
Shallow, temporary salt lakes, known as ephemeral playas, are considered among the hydrogeological most sensitive systems to climatic extreme perturbations and flood extent. With a drainage basin exceeding 1,000,000 km2 and a lake depth of less than 6.5 m, Kati Thanda-Lake Eyre (KT-LE), in Southern Australia, is characterized by a highly variable water balance and large water level...
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Aline Houdy, Simon Weil30/03/2026 11:15Conference
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30/03/2026 12:15
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30/03/2026 12:15
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30/03/2026 12:15
The deployment of dense seismic arrays on volcanoes has increased significantly over the past decades, enabling more precise monitoring of volcanic activity. While short-period sensors are commonly used, Distributed Acoustic Sensing (DAS) represents a promising complementary technology, providing high spatial resolution and remote location of the interrogator. Accurate monitoring requires a...
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30/03/2026 12:15
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30/03/2026 12:15
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30/03/2026 12:15
Wetlands developing in semi-arid regions are increasingly affected by salinisation and trace element enrichment; processes that should increase in time with climate changes and anthropic activities. The Okavango Delta (Botswana) provides a rare example of a pristine wetland that nevertheless shows evidence of trace element contamination. This alluvial fan located in the SW termination of the...
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30/03/2026 12:15
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30/03/2026 12:15
Seismic hazard assessment partly relies on the ability to predict ground motion, particularly near the source, where damage is generally the most severe. In this region, existing strong-motion database lack sufficient recordings, leading to poorly calibrated prediction models and large uncertainties. My PhD research aims to confront these models with seismic ground motions recorded close to...
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30/03/2026 12:15
Chlorine is a volatile element commonly found in various types of waste, including legacy radioactive waste and waste generated by molten salt reactors. The presence of chlorine in these wastes represents a significant challenge for long-term immobilization, as its vitrification in conventional borosilicate glasses is hindered by the low solubility of chlorine, leading to volatilization losses...
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30/03/2026 12:15
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30/03/2026 12:15
The bioavailability and ecotoxicity of trace metals (such as Cu, Cd, and Pb) in the environment is largely governed by sorption processes. Natural organic matter (NOM) serves as the primary sorbent in soils and aquatic systems. It is known that NOM binds trace metals through some of its functional groups, particularly carboxylates and phenolates. However, due to its heterogeneous and...
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30/03/2026 12:15
Sub-Neptunes are the most abundant class of exoplanets found in the universe,
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yet they have no analogue in our own Solar System. Understanding their atmospheres and the underlying physical processes remains of prime interest. Despite significant progress in exoplanet observations and modeling, many aspects of sub-Neptune atmospheres remain poorly constrained. In particular, their atmospheric... -
30/03/2026 12:15
Rapid and objective mapping of co-seismic surface ruptures is essential for post-earthquake impact assessment and for improving our understanding of fault geometry, stress transfer, and rupture processes that inform longer-term seismic hazard analyses. However, rupture mapping has traditionally relied on manual interpretation of field observations or remote-sensing data, which is...
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30/03/2026 12:15
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30/03/2026 12:15
Since the first discovery of a hot Jupiter in 1995 (Mayor & Queloz, 1995), and the detection of the atmosphere of one of them (Charbonneau et al., 2002) the accurate modeling of exoplanetary atmospheres has become central to understand planet formation, chemical composition, and whether their pressure and temperature conditions support the existence of liquid water at their surfaces. With the...
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30/03/2026 12:15
Unraveling the nature (physical state) of magma reservoirs beneath active volcanoes is essential to understand their eruption potential. Magma can be in a pure melt state and hence it is more likely to erupt if supplied by fresh melt from below, or in a mush state that is less likely to erupt. However, imaging magma reservoirs on land and deciphering their physical properties is inherently...
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30/03/2026 12:15
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30/03/2026 12:15
Abstract. This study addresses the current challenges of understanding and managing PFAS contamination. It pays particular attention to the limitations of existing separation technologies and the incomplete description of the mechanisms of PFAS behaviour in air water phase. Through an examination of recent literature, the study identifies key unresolved questions concerning interfacial...
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30/03/2026 12:15
This poster will discuss about the preliminary results of a teledetection study in the Okavango Delta (Botswana). The aim of the study is to analyse the spatial and temporal distribution of salt deposits on the surface of the Delta, using Sentinel-2 and Pleiade-NEO images.
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30/03/2026 12:15
Desert landscapes are highly-sensitive environments to climate changes. This high sensitivity is mostly due to their scarce water resources, together with a direct exposure of bare rocks and soils to meteorological
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phenomena. As a result, in these arid environments, even minor shifts in hydroclimatic conditions can significantly modify hydrography, vegetation cover, and sediment transport by... -
30/03/2026 12:15
Soil contamination by refined petroleum hydrocarbons remains a significant environmental problem due to these compounds' toxicity, persistence, and mobility. Bioremediation has emerged as an environmentally friendly and cost-effective approach that uses microorganisms to degrade hydrocarbons into less harmful substances. However, its overall performance is often limited by nonuniform...
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30/03/2026 12:15
Galaxy clusters provide a powerful way to study how galaxies evolve. At redshifts up to $z\sim1$, dense regions like clusters tend to host massive quenched galaxies, while isolated galaxies remain more active. However, this trend is less understood at higher redshifts, where some cluster cores still show strong star-formation. When do these changes appears?
In this work, we aim to establish...
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30/03/2026 12:15
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30/03/2026 12:15
The Asal-Ghoubbet rift in the Republic of Djibouti serves as an exceptional natural laboratory of planetary interest, characterized by complex igneous lithology, hydrothermal alterations, and Holocene evaporitic deposits. The EnMAP (Environmental Mapping and Analysis Program) hyperspectral mission provides a critical opportunity to characterize these surfaces through high-resolution...
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30/03/2026 12:15
The anthropogenic use of platinum (Pt) has significantly altered its biogeochemical cycle over recent decades [1], leading to its increasing dispersion in the environment. Microorganisms, ubiquitous in ecosystems, strongly influence metal speciation. While some metals are essential for microbial metabolism, their transformations may also generate toxic forms that microorganisms mitigate...
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30/03/2026 12:15
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30/03/2026 12:15
We investigate the impact of scan direction-dependent time domain filtering in Simons Observatory SATs. SO SATs scan in azimuth at constant elevation, separated into "rising" and "setting" scans. Simple filter+bin map-making produce biased CMB maps that can be corrected at the power spectrum level via a transfer function (estimated from simulations). While this correction is robust for a...
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30/03/2026 12:15
Per- and polyfluoroalkyl substances (PFAS) are a family of compounds listed as persistent, mobile and toxic, posing significant risks to human health and ecosystems. Some PFAS, notably those present in Aqueous Film-Forming Foam (AFFF) exhibit significant adsorption at fluid-fluid interfaces (e.g., air-water interfaces), which play a crucial role in their transport through soil and groundwater....
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30/03/2026 12:15
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30/03/2026 12:15
The investigation of geomagnetic variations has revealed the presence in Earth's core of a planetary-scale, axially columnar and eccentric gyre flow. Together with the magnetic anomaly of low intensity presently seen beneath the South Atlantic, these structures show that longitudinal hemisphericity is a common feature of the geodynamo. Here, we propose that these hemispherical features result...
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30/03/2026 12:15
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30/03/2026 12:15
Time series of GNSS station positions play a central role in the study of Earth’s surface deformation and in the realization of terrestrial reference frames. Despite significant progress, these time series remain affected by non-geophysical signals, thereby limiting the investigation of millimeter-level deformations. Among these perturbations, periodic signals of satellite origin —...
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30/03/2026 12:15
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30/03/2026 12:15
Loess (L) and paleosol (P) sequences represent continuous continental archives of environmental changes. Apart from their significance as paleoclimate archives, they may also record variations of the Earth’s magnetic field at high temporal resolution. Confirming the reliability of loess sequences as recorders of geomagnetic secular variations (PSV) and relative paleointensity (RPI) would help...
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30/03/2026 12:15
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30/03/2026 12:15
Small-scale heterogeneities in the lunar mantle can be detected through high-frequency scattering of seismic waves [1], but their characterization is limited by uncertainties in phase picking. In this study, we present a systematic analysis of P-wave arrival times from shallow moonquakes, using a refined picking strategy based on a detailed characterization of pre-event noise and...
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30/03/2026 12:15
The nature of dark matter remains one of the most compelling open questions in particle physics. Although overwhelming gravitational evidence supports its existence, no direct detection via non-gravitational interactions has yet been achieved. Among the proposed candidates, Weakly Interacting Massive Particles (WIMPs) are strongly motivated theoretically. Extensive experimental efforts have...
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30/03/2026 12:15
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30/03/2026 12:15
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30/03/2026 12:15
L’éruption Fogo A (~4600 ans BP) sur l’île de São Miguel figure parmi les éruptions pliniennes les plus puissantes documentées dans l’archipel des Açores. L’analyse de sa séquence éruptive révèle une phase initiale phréatomagmatique, suivie du développement d’une colonne plinienne soutenue, puis d’un épisode final d’effondrement partiel de la colonne accompagnant la production de coulées...
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30/03/2026 12:15
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30/03/2026 12:15
Wildfires increasingly threaten ecosystems worldwide, yet their impact on nanoparticle formation and environmental mobility remains poorly understood. This study investigates how combustion intensity influences the production, composition, and magnetic properties of inorganic nanoparticles through controlled laboratory experiments on heather biomass. Combining nanoparticles analyses in...
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30/03/2026 12:15
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30/03/2026 12:15
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30/03/2026 12:15
The VELI instrumented site, accredited by INSU-CNRS in 2009, aims to develop long-term observatory activities on explosive Indonesian volcanoes. Mount Merapi (Central Java) is the primary target, with the deployment of a comprehensive monitoring platform integrating geophysical and geochemical measurements, including seismicity, ground deformation, electrical and thermal parameters, and gas...
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30/03/2026 12:15
Large earthquakes commonly occur along plate boundaries, but, although less frequent, they can also take place within slowly deforming continental interiors. In these intraplate settings, deformation is challenging to measure with geodetic methods, and the long recurrence time of major earthquakes means that direct observations — instrumental or historical — are scarce. Aftershocks and...
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30/03/2026 12:15
Galaxy clusters are powerful and key cosmological probes that trace the evolution of large-scale structures of the universe and inform models of cosmic evolution. The Vera Rubin Legacy Survey of Space and Time (LSST) will provide deep, wide-field optical imaging, enabling the detection of thousands of galaxy clusters up to high redshifts. I am adapting the YOLO-CL convolutional neural network...
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Flavien Vansyngel (Institut d'Astrophysique Spatiale)30/03/2026 15:00After PhD conference
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Julien Aubert (IPGP)30/03/2026 15:30After PhD conference
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31/03/2026 11:00
Dragonfly, NASA’s next New Frontiers mission, will explore Titan in the mid-2030s and, for the first time, deploy a seismometer on the surface of an icy moon. Titan is believed to host a subsurface water ocean beneath a thick ice shell, making it a prime target for understanding icy ocean worlds and their potential habitability. In this context, seismology provides a unique tool to probe...
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31/03/2026 11:13
Mass-balance approaches using different geochemical tracers yield contrasting and inconsistent estimates of how the present-day mantle compares to the primitive mantle taken as the bulk silicate Earth (BSE). The Sm-Nd isotopic system suggests it represents only ~20-50% of BSE, whereas the Nb/U ratio implies a fraction higher than 60% [1]. To address this discrepancy, we investigated whether...
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31/03/2026 11:40
Hydrothermal circulation and associated alteration of the oceanic lithosphere are the first order control on Earth’s volatile cycles and have been proposed as a potential driver of the emergence of life on our planet. Constraining the extent of oceanic lithosphere’s alteration, and its consequences on lithospheric composition, carbon budget including abiotic organic compound formation is thus...
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31/03/2026 11:53
The DarkSide20k experiment is a direct Dark Matter detector focused on the search for WIMP dark matter. Its main component is a dual-phase Argon Time Projection Chamber (TPC) where WIMPs are mainly detected as nuclear recoils from collisions with Argon nuclei and the subsequent emission of scintillation light as well as ionisation electrons. Since the rate of signal events is expected to be...
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31/03/2026 12:06
Precision space instrumentation requires a rigorous accounting of noise sources that deviate from ideal models. While traditional differential Low-Noise Amplifier (LNA) design focuses on intrinsic thermal and shot noise, stochastic transistor mismatch presents a critical bottleneck in reaching the theoretical noise floor. Specifically, the non-ideal elevation of flicker noise is...
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31/03/2026 15:00
Our Universe is permeated by magnetic fields across a vast range of scales. The key to the origin of cosmic magnetism may lie in the emptiest regions of the Large Scale Structure, called the cosmic voids, where primordial fields from the early Universe are expected to have remained intact. The strength of this weak Intergalactic Magnetic Field (IGMF) can be constrained from below by...
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31/03/2026 15:13
Have you ever looked up at the night sky and wondered where our world came from, or how it all began? These are the fundamental questions that astrophysicists and cosmologists strive to answer. We now know that the Big Bang is the most robust theory explaining the origin and evolution of our Universe.
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Thanks to numerous ground and space experiments, we have... -
31/03/2026 15:26
Stochastic particle acceleration in magnetized turbulent plasmas, and its resulting multi-messenger signatures, has received increased attention in recent years. A detailed modeling of this process is however made complex by the need to treat simultaneously particle acceleration and radiative processes.
We present here a hybrid numerical code that couples AM3 [1], a state-of-the-art,...
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31/03/2026 15:39
Black holes are among the simplest objects to describe with a theory of gravity. To achieve a better understanding of their structure, physicists study how they behave when deformed by an external object.
In this presentation, I will first review the definition of black holes in General Relativity and their main properties . I will then briefly describe how their response to external...
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31/03/2026 16:15
Mount Fuji, located approximately 100 km from Tokyo, threatens more than 30 million people. Despite its last eruption in 1707, the volcano has remained quiet for over three centuries, resulting in relatively limited monitoring and an incomplete understanding of its current state and future eruptive potential.
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The aim of this study is to understand how seismic observations can reveal the... -
31/03/2026 16:33
Tsunamis are among the most devastating natural hazards, leading to significant human casualties. They are typically triggered by submarine earthquakes, volcanic eruptions, or landslide, and predicting their impact remains extremely challenging.
Although various techniques are currently employed to monitor tsunami propagatio in both the near-field (within 500 km of the source) and ther far...
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31/03/2026 16:46
During the early stages of the evolution of rocky planets, heat due to accretion, core formation, and radioactive decay has likely melted their silicate mantles, creating global magma oceans. As the magma ocean cools down and solidifies, dissolved volatiles are progressively outgassed, forming a secondary atmosphere. Greenhouse gases in this atmosphere form an insulating blanket that controls...
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31/03/2026 16:59
Due to the variability introduced by physical and chemical properties, acquisition conditions, and spectral mixing, interpreting soil reflectance spectra from hyperspectral imaging is challenging. This variability alters the position and shape of absorption bands. Studying the impact of water content, grain size, and acquisition geometry requires defining parameters that are physically based...
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31/03/2026 17:12
Understanding the interactions between trace metals and organic matter (OM) is crucial due to its influence on metal speciation, mobility, toxicity, and bioavailability. Cerium (Ce) is of particular interest due to its industrial use, natural occurrence and unique redox chemistry. It exists in both the +III and +IV oxidation states, enabling redox cycling in surface environments. However, the...
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This poster will focus on the behavior of ice and its influence on the thermal evolution of the first planetary bodies, known as planetesimals, in order to determine the age of iron meteorites. For now, this poster will only address the numerical modeling of this thermal evolution.
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Frequency dependent squeezing is a crucial and well established technology in current gravitational wave detectors. Future detectors such as Einstein Telescope will heavily rely on this technology since it is the only way to go beyond the standard quantum noise limit and increase the sensitivity of the detectors when we cannot increase the power. Current detectors such as VIRGO and LIGO only...
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Éric Chassande-Mottin (APC)Introduction
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Sonia El HedriKeynote conference
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The Greenland Ice Sheet (GrIS) is currently undergoing substantial mass loss, with major
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consequences for both the Earth system and human societies, including a significant
contribution to the ongoing acceleration of global mean sea level rise. Accurately
estimating the GrIS mass balance therefore represents a major focus of current research.
However, it remains challenging and, to date,...
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