Andréa Walpersdorf
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View article: Combining updated structural and geophysical data into earthquake recurrence models for the SE of France
Combining updated structural and geophysical data into earthquake recurrence models for the SE of France Open
South-East France is found in a continental active tectonic domain where seismic activity is low to moderate and crustal deformation is slow, nevertheless historical seismic catalogs (Rovida et al., 2022) present about 10 Mw 5 and 1 Mw 6 e…
View article: Creep enhancement and sliding in a temperate, hard-bedded alpine glacier
Creep enhancement and sliding in a temperate, hard-bedded alpine glacier Open
Glacier internal deformation is usually described by Glen's flow law using two material parameters: the creep factor (A) and the flow law exponent (n). However, the values of these parameters and their spatial and temporal variability are …
View article: Surface mass balance monitoring of an alpine glacier using GNSS Interferometric Reflectometry
Surface mass balance monitoring of an alpine glacier using GNSS Interferometric Reflectometry Open
Assessing glacier surface mass balance (SMB) is essential for evaluating glacier response to climate change. However, traditional in situ measurement methods are labour intensive and often lack the temporal and spatial resolutions required…
View article: Active faulting in the Alps as seen by GNSS: comparative case-studies from the Belledonne and High-Durance fault systems
Active faulting in the Alps as seen by GNSS: comparative case-studies from the Belledonne and High-Durance fault systems Open
In the W-Alpine context, where active deformation is slow and seismicity is moderate, the question of determining and characterizing active faulting remains a scientific challenge. However, previous studies have shown that reliable geodeti…
View article: Shaping the crustal structure of the SW-Alpine Foreland: Insights from 3D Geological modeling
Shaping the crustal structure of the SW-Alpine Foreland: Insights from 3D Geological modeling Open
Reactivation processes play a significative role in the localization of deformation but still remain hard to establish at the lithospheric scale. In this work, we built a 3D structural model, which enables to bridge the gap between the mai…
View article: Constraints on the 2013 Saravan intraslab earthquake using permanent GNSS, InSAR and seismic data
Constraints on the 2013 Saravan intraslab earthquake using permanent GNSS, InSAR and seismic data Open
SUMMARY On 16 April 2013, an Mw = 7.7 earthquake struck the border of Iran and Pakistan in the central part of the Makran subduction zone with a reported depth of 80 km by USGS. This rare event in this poorly instrumented region helps to s…
View article: Observing and Modeling Short‐Term Changes in Basal Friction During Rain‐Induced Speed‐Ups on an Alpine Glacier
Observing and Modeling Short‐Term Changes in Basal Friction During Rain‐Induced Speed‐Ups on an Alpine Glacier Open
Basal shear stress on hard‐bedded glaciers results from normal stress against bed roughness, which depends on basal water pressure and cavity size. These quantities are related in a steady state but are expected to behave differently under…
View article: Creep enhancement and sliding in a temperate, hard-bedded alpine glacier
Creep enhancement and sliding in a temperate, hard-bedded alpine glacier Open
Glacier internal deformation is usually described by Glen's Law using two material parameters, the creep factor A and the flow law exponent n. However, the values of these parameters and their spatial and temporal variability are rather un…
View article: Observing and modeling short-term changes in basal friction during rain-induced speed-ups on an Alpine glacier
Observing and modeling short-term changes in basal friction during rain-induced speed-ups on an Alpine glacier Open
Basal shear stress on hard-bedded glaciers results from normal stress against bed roughness, which depends on basal water pressure and cavity size. These quantities are related in a steady state but are expected to behave differently under…
View article: Sliding velocity, water discharge, water pressure, and rainfall time series at Argentière Glacier between 2019 and 2021
Sliding velocity, water discharge, water pressure, and rainfall time series at Argentière Glacier between 2019 and 2021 Open
Files Description: ==================================cavitometer_2019-2021.dat:================================== Contains 30-min sampled values of recorded sliding velocities at the cavitometer. Column 1 = DateColumn 2 = Velocity (mm/hour…
View article: Sliding velocity, water discharge, water pressure, and rainfall time series at Argentière Glacier between 2019 and 2021
Sliding velocity, water discharge, water pressure, and rainfall time series at Argentière Glacier between 2019 and 2021 Open
Files Description: ==================================cavitometer_2019-2021.dat:================================== Contains 30-min sampled values of recorded sliding velocities at the cavitometer. Column 1 = DateColumn 2 = Velocity (mm/hour…
View article: Mapping Glacier Basal Sliding Applying Machine Learning
Mapping Glacier Basal Sliding Applying Machine Learning Open
During the RESOLVE project (“High‐resolution imaging in subsurface geophysics: development of a multi‐instrument platform for interdisciplinary research”), continuous surface displacement and seismic array observations were obtained on Gla…
View article: Seven years of postseismic deformation following Mw 7.7 2013 Saravan intra-slab earthquake from InSAR time series
Seven years of postseismic deformation following Mw 7.7 2013 Saravan intra-slab earthquake from InSAR time series Open
The 2013 April 16 Mw 7.7 Saravan earthquake, an intra-slab earthquake with a normal faulting mechanism, occurred in the Makran subduction zone, where the Arabian oceanic lithosphere subducts northward under Iran and Pakistan. To examine th…
View article: Mapping glacier basal sliding applying machine learning
Mapping glacier basal sliding applying machine learning Open
During the RESOLVE project ("High-resolution imaging in subsurface geophysics: development of a multi-instrument platform for interdisciplinary research"), continuous surface displacement and seismic array observations were obtained on Gla…
View article: InSAR constraints on coseismic and postseismic deformation of the 2021 Ganaveh earthquake along the Zagros Foredeep fault
InSAR constraints on coseismic and postseismic deformation of the 2021 Ganaveh earthquake along the Zagros Foredeep fault Open
The moderate magnitude (Mw 5.8) Ganaveh earthquake, as a compressive event. occurred on 2021 April 18 in the southwest of the Dezful embayment of the Zagros Mountain belt, Iran. We process Sentinel-1 SAR images in ascending and descending …
View article: Rain-induced transient variations in glacier dynamics characterized by a continuous and dense GPS network at the Glacier d’Argentiere
Rain-induced transient variations in glacier dynamics characterized by a continuous and dense GPS network at the Glacier d’Argentiere Open
The motion of glaciers with a temperate base is highly variable in time and space, mainly as a result of glacier basal sliding being strongly modulated by subglacial hydrology. Although transient friction laws have recently been establishe…
View article: Mapping glacier basal sliding with machine learning
Mapping glacier basal sliding with machine learning Open
During the RESOLVE project ("High-resolution imaging in subsurface geophysics: development of a multi-instrument platform for interdisciplinary research"), continuous surface displacement and seismic array observations were obtained on Gla…
View article: The 2013 Slab‐Wide Kamchatka Earthquake Sequence
The 2013 Slab‐Wide Kamchatka Earthquake Sequence Open
Studies of initiation of large earthquakes are usually focused on frictional instabilities occurring in the near vicinity of the future rupture. Possible contributions of long‐distance interactions with large‐scale tectonic instabilities r…
View article: Harmonic Analysis of the Relationship between GNSS Precipitable Water Vapor and Heavy Rainfall over the Northwest Equatorial Coast, Andes, and Amazon Regions
Harmonic Analysis of the Relationship between GNSS Precipitable Water Vapor and Heavy Rainfall over the Northwest Equatorial Coast, Andes, and Amazon Regions Open
This study finds the relationship between increases in precipitable water vapor (PWV), and intense rainfall events in four different climatological regions of South America’s equatorial northwest: the coast, Andes valley, high mountains, a…
View article: Tectonic Transfer from the Western Alpine Front to the French Rhône Valley in its 3D-Structural Context
Tectonic Transfer from the Western Alpine Front to the French Rhône Valley in its 3D-Structural Context Open
<p>The Western Alps current tectonics is characterized by seismically active radial extension in the core of the belt, combined with transcurrent to transpressive tectonics in its external zone and foreland associated with a moderate…
View article: Kamchatka 2013 GNSS Time series
Kamchatka 2013 GNSS Time series Open
GNSS time series presented in the article: "The 2013 slab-wide Kamchatka earthquake sequence" The columns of the files correspond to Year ; Month ; Day ; Hour ; Minute ; Second ; East position (mm) ; North position (mm) ; Up position (mm) …
View article: Kamchatka 2013 GNSS Time series
Kamchatka 2013 GNSS Time series Open
GNSS time series presented in the article: "The 2013 slab-wide Kamchatka earthquake sequence" The columns of the files correspond to Year ; Month ; Day ; Hour ; Minute ; Second ; East position (mm) ; North position (mm) ; Up position (mm) …
View article: Evidence of Seasonal Uplift in the Argentière Glacier (Mont Blanc Area, France)
Evidence of Seasonal Uplift in the Argentière Glacier (Mont Blanc Area, France) Open
The hydromechanical processes by which basal water controls sliding at the glacier bed are poorly known, despite glacier basal motion being responsible for a large part of ice flux in temperate alpine glaciers. Previous studies suggest tha…
View article: Slip model of the 2013 April 16 Mw 7.7 Saravan intra-slab earthquake (Makran subduction zone) derived from InSAR, GPS, and Teleseismic P-wave modeling
Slip model of the 2013 April 16 Mw 7.7 Saravan intra-slab earthquake (Makran subduction zone) derived from InSAR, GPS, and Teleseismic P-wave modeling Open
<p>The 2013 April 16 Mw 7.7 Saravan earthquake, an intra-slab earthquake with a normal faulting mechanism at of 50 km depth, occurred in the western part of the Makran subduction zone, where the Arabian oceanic lithosphere subducts n…
View article: Short-term surface velocity variations of the Argenti&#232;re glacier monitored with a high-resolution continuous GNSS network
Short-term surface velocity variations of the Argentière glacier monitored with a high-resolution continuous GNSS network Open
<p>The motion of glaciers with a temperate base is highly variable in time and space as a result of glacier basal sliding being strongly modulated by subglacial hydrology. Here we investigate short term (diurnal to multi-diurnal) cha…
View article: Mapping Glacier Basal Sliding with Beamforming and Artificial Intelligence
Mapping Glacier Basal Sliding with Beamforming and Artificial Intelligence Open
<p>The cryosphere is a highly active and dynamic environment that rapidly responds to changing climatic conditions. In particular, the physical processes behind glacial dynamics are poorly understood because they remain challenging t…
View article: Annual deformation and sliding in an alpine temperate glacier: observations and implications for ice rheology and seasonal variation
Annual deformation and sliding in an alpine temperate glacier: observations and implications for ice rheology and seasonal variation Open
<p>Glacier deformation velocity is typically linked to ice thickness and is very sensitive to parameters of the Glen&#8217;s flow law (i.e. rate factor <em>A </em>and flow exponent <em>n</em>). Detailed ob…
View article: InSAR constraints on interseismic slip-rate of the Esfarayen fault, northeastern Iran
InSAR constraints on interseismic slip-rate of the Esfarayen fault, northeastern Iran Open
<p>In the last decades, GNSS constraints and geological estimates of the fault slip rates improve the understating of the kinematics of faulting across Iran, particularly in the northeastern part of the country. Here, we complete the…