Abstract. In active mountain belts with steep terrain, bedrock landsliding is a major erosional agent. the Himalayas, driven by annual hydro-meteorological forcing due to summer monsoon and rarer, exceptional events, such as earthquakes. Independent methods yield erosion rate estimates that appear increase sampling time, suggesting rare, high-magnitude events dominate budget. Nevertheless, until now, neither contribution of earthquakes landslide nor proportion giant landslides have been...

Abstract Sediment supply ( Q s ) is often overlooked in modelling studies of landscape evolution, despite sediment playing a key role the physical processes that drive erosion and sedimentation river channels. Here, we show direct impact coarse‐grained, hard on geometry bedrock channels from Rangitikei River, New Zealand. Channels receiving coarse bedload are systematically (up to an order magnitude) wider than with no input for given discharge. We also present model experiments channel...

Abstract Through the release of groundwater, most mountain rivers run year‐round despite their small catchments and sporadic precipitation. This makes ranges important sources reliable freshwater for downstream populations in many parts world. However, due to a lack ground instrumentation, little is known about groundwater dynamics mountainous landscapes. Recent research has shown that amount moisture trapped soil weathered rocks vadose zone can significantly buffer recharge runoff but wider...

Abstract Shallow earthquakes frequently disturb the hydrological and mechanical state of subsurface, with consequences for hazard water management. Transient post‐seismic behavior has been widely reported, suggesting that recovery material properties (relaxation) following ground shaking may impact groundwater fluctuations. However, monitoring seismic velocity variations associated earthquake damage are often done assuming both effects independent. In a field site prone to highly variable...

SUMMARY Ground shaking induced by earthquakes often introduces transient changes in seismic velocity monitored with ambient noise. These are usually attributed to relaxation behaviour following the coseismic damage subsurface and of relevance for post-seismic hazard mitigation. However, evolution associated this phenomenon can occur at very small timescales amplitudes that not resolved interferometry therefore challenging link laboratory experiments. A way improve temporal resolution...

Abstract Volcanic inflation and deflation often precede eruptions can lead to seismic velocity changes ( ) in the subsurface. Recently, interferometry on coda of ambient noise‐cross‐correlation functions yielded encouraging results detecting these at active volcanoes. Here, we analyze data recorded Klyuchevskoy Group Kamchatka, Russia, between summer 2015 2016 study signals related volcanic activity. However, ubiquitous tremors introduce distortions noise wavefield that cause artifacts...

Scientific outreach is often made through visualisation: graphic design, filmmaking etc… As a seismologist, I thought that seismic waveforms could look little bit unappealing to the eye (some may strongly disagree with me). Fortunately, there have been recent efforts use sound visualise and listen earthquake data, making for unique exhibitions. Here, propose go beyond by transforming arranging data into electronic dance music. On this poster, I  show workflow behind...

ABSTRACT In mountainous terrain, large earthquakes often cause widespread coseismic landsliding as well hydrological and hydrogeological disturbances. A subsequent transient phase with high landslide rates has also been reported for several earthquakes. Separately, subsurface seismic velocities are frequently observed to drop coseismically subsequently recover. Consistent various laboratory work, we hypothesize that the seismic-velocity changes track damage progressive recovery of landscape...

There is a growing understanding that groundwater has an important volume in mountainous areas,  controlling hydrological budgets and fluxes towards lowland basins. However, the observation of this reservoir challenging, with less boreholes steep remote catchments. In last decade, attempts to monitor via seismic waves velocity monitoring (a technique called interferometry) have emerged, opening interesting avenues for mountain hydrology. Indeed, deployment stations at high elevation...

The Himalayan region is crucial for providing water resources to millions of people in downstream regions across Asia. However, the processes governing groundwater storage and flow steep mountain catchments remain poorly understood, particularly regarding interplay between monsoonal rainfall, infiltration, recharge these highly dynamic landscapes. This study investigates Kahule Khola watershed central Nepal, combining field-based approaches encompassing Electrical Resistivity Tomography...

The pathway for rainfall into stream flow in mountain catchments can be fast via surface run-off or short-lived storage the weathered zone, slow deep fractured bedrock groundwater system. In mountainous topography, springs found at almost all elevations, suggesting that occurs elevations. There is however uncertainty as if this short lived, confined to longer lived and part of Intermittent streams might reflect water within subsurface. To measure intermittency migration associated headwater...

Cliff failure is a fundamental process shaping many coastlines worldwide. Improved insight into direct links between cliff and forcing mechanisms requires precise information on the timing of individual failures, which difficult to obtain with conventional observation methods for longer stretches coastline. Here we use seismic records auxiliary data spanning 25 months precisely identify locate 81 events along 8.6‐km‐long chalk coast Jasmund, Germany's largest island, Rügen. The subminute...

Abstract Large rock slope failures play a pivotal role in long‐term landscape evolution and are major concern land use planning hazard aspects. While the failure phase time immediately prior to increasingly well studied, nature of preparation remains enigmatic. This knowledge gap is due, large degree, difficulties associated with instrumenting high mountain terrain local classic monitoring methods, which does not allow integral observation volumes. Here, we analyse data from small network up...

Abstract. In active mountain belts with steep terrain bedrock landsliding is a major erosional agent. the Himalayas, driven by annual hydro-meteorological forcing due to summer monsoon and rarer, exceptional events, such as earthquakes. Independent methods yield erosion rate estimates that appear increase sampling time, suggesting rare, high magnitude events dominate budget. Nevertheless, until now, neither contribution of earthquakes landslide erosion, nor proportion giant landslides have...

Cliff failure is a fundamental process shaping many coastlines worldwide. Improved insight into direct links between cliff and forcing mechanisms requires precise information on the timing of individual failures, which difficult to obtain with conventional observation methods for longer stretches coastline. Here we use seismic records auxiliary data spanning 25 months precisely identify locate 81 events along 8.6-km long chalk coast Jasmund, Germany’s largest island, Rügen. The sub-minute...

Abstract Gravitational mass wasting prediction requires understanding of the factors controlling failure. Prior to slope failure, cracks in weakened rock are thought grow and coalesce, eventually forming a continuous failure plane. Here, we apply hidden Markov machine learning model seismic data, revealing temporal evolution prior major rockslide event Swiss Alps. After prolonged linear increase crack cumulative number, an S-shaped rate pattern occurred day before rockslide. A simple...

Shallow earthquakes frequently disturb the hydrological and mechanical state of subsurface, with consequences for hazard water management. Transient post-seismic behaviour has been widely reported, suggesting that recovery material properties (relaxation) following ground shaking may impact groundwater fluctuations. However, monitoring seismic velocity variations associated earthquake damage are often done assuming both effects independent. In a field site prone to highly variable...

Groundwater storage monitoring is now one of the most promising application seismic interferometry techniques. In steep mountain environments, where drilling wells particularly challenging, use stations to retrieve relative velocity changes could fundamentally advance our understanding groundwater dynamics. However, very few studies have looked at variations scale a single topography unit. Here, we estimate from six covering distance 3.5 km on ridge in county Hualien, Taiwan. One station was...

Earthquakes introduce transient mechanical damage in the subsurface, which causes postseismic hazards and can take years to recover. This observation has been linked relaxation, a phenomenon observed wide class of materials after straining perturbations, but its duration earthquake ground shaking not constrained. Here, we analyse effects two successive large earthquakes their aftershocks on properties using estimates seismic velocity from ambient noise interferometry. We show that relaxation...

Groundwater flow paths in mountainous regions dictate how water is transferred from the surface, through weathering zone, and into bedrock aquifer system. Previous studies have established critical role of aquifers sustaining mountain river gradual release water. However, specific pathways that groundwater takes zone to reach deeper remain poorly understood. In this study, we investigate partitioning transfer surface rainfall input a deep reservoir within steep Himalayan catchment central...

Large rock slope failures play a pivotal role in long-term landscape evolution and are major concern land use planning hazard aspects. While the failure phase time immediately prior to increasingly well studied, nature of preparation remains enigmatic. This knowledge gap is due, large degree, difficulties associated with instrumenting high mountain terrain local classic monitoring methods, which does not allow integral observation volumes. Here, we analyse data from small network up seven...

Dans le cadre du séminaire « Géographie des émotions » organisé par Pauline Guinard et Bénédicte Tratnjek à l'