Anne-Sophie MreyenUniversity of Liège | ulg · Applied Geophysics (ArGEnCo)
Anne-Sophie Mreyen
Ph.D.
About
38
Publications
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Introduction
Anne-Sophie Mreyen currently works at the Department of Applied Geophysics, University of Liège. Anne-Sophie does research in Geophysics, Geomodelling and Engineering Geology. Their most recent publication is 'Multiple geophysical investigations to characterise massive slope failure deposits: application to the Balta rockslide, Carpathians'.
Skills and Expertise
Additional affiliations
February 2021 - July 2021
Education
October 2016 - January 2021
October 2013 - June 2016
Publications
Publications (38)
While geodetic measurements have long been used to assess landslides, seismic methods are increasingly recognized as valuable tools for providing additional insights into subsurface structures and mechanisms. This work aims to characterize the subsurface structures of the deep-seated gravitational slope deformation (DSGSD) at Heinzenberg through th...
Glueer, F., Mreyen, A.-S., Cauchie, L., Havenith, H.-B., Bergamo, P., Hallo, M., Fäh, D. (2024): Integrating Seismic Methods for Characterizing and Monitoring Landslides: A Case Study of the Heinzenberg Deep-Seated Gravitational Slope Deformation (Switzerland), Geosciences, 14 (2): 28. https://doi.org/10.3390/geosciences14020028
Purpose: The article presents new prospection results obtained for the incipient San Andrés landslide on the El Hierro (Canary Islands, Spain) island, which represents a giant instability of this volcanic island and thus belongs to the largest known mass movements on Earth. Methods: The research combines multiple geophysical measurement techniques...
Figure S1: Four examples of the H/V curves indicating prominent subsurface contrasts. The identified resonance frequencies are marked with gray solid lines and the values along with the location identifiers are in the titles; Figure S2: Photograph (c) shows an extraction of the rock sample of the porous basalt (for explanation see text); Figure S3:...
The San Andrés landslide on El Hierro (Canary Islands) represents a rare opportunity
to study an incipient volcanic island flank collapse with an extensive onshore part. The presented
research improves the knowledge of the internal structure and rock characteristics of a mega-landslide
before its complete failure. The investigation combines multipl...
First analyses of landslide distribution and triggering factors are presented for the region affected by the 14 August 2021 earthquake (Mw=7.2) in the Nippes Department, Haiti. Landslide mapping was mainly carried out by comparing pre- and post-event remote imagery (∼0.5–1 m resolution) available on Google Earth Pro® and Sentinel-2 (10 m resolution...
Ancient landslides of unknown origin can be found in large numbers in mountainous regions; some represent valid markers of (pre-)historic natural regimes referring to either long-term evolution or short-term peak events of climatic and seismotectonic nature. An example is represented by the Balta rockslide in the Romanian Carpathian Mountains. Its...
First analyses of landslide distribution and triggering factors are presented for the region affected by the August, 14, 2021, earthquake (Mw=7.2) in the Nippes Department, Haiti. Landslide mapping was mainly carried out by comparing pre- and post-event remote imagery (~0.5–1-m resolution) available on Google Earth Pro® and Sentinel-2 (10-m resolut...
Ancient landslides of unknown origin can be found in large numbers in hilly and mountainous regions ; some represent valid markers of (pre-)historic natural regimes referring to either long-term evolution or short-term peak events of climatic and seismotectonic nature. The Balta rockslide in the Romanian Carpathian Mountains represents such a key s...
There have been many studies exploring rainfall-induced slope failures in earthquake-affected terrain. However, studies evaluating the potential effects of both landslide-triggering factors – rainfall and earthquakes – have been infrequent despite rising global landslide mortality risk. The SE Carpathians, which have been subjected to many large hi...
There have been many studies exploring the rainfall induced slope failures in the earthquake affected terrain. However, studies evaluating the potential effects of both landslide triggering factors; rainfall and earthquake have been infrequent despite the rising global landslide mortality risk. The SE Carpathians, which have been subjected to many...
The proposed research aims at the investigation of large mass movements on volcanic islands, like the San Andres landslide on El Hierro island (Canary Islands, Spain). These coastal and submarine landslides are extremely large (with run-out exceeding tens of km) and voluminous (up to hundreds of km 3). They represent therefore a major geological ha...
In the frame of a Belgo-Haitian cooperation project (PIC 2012-2016), a study of the local seismic hazard was performed in Fond Parisien, an area located on the foothills of the "Massif de la Selle", along the easternmost portion of the Enriquillo Plantain Garden Fault (EPGF). The H/V Spectral Ratio (HVSR) technique was applied to study the resonanc...
To better comprehend mechanisms at the origin of natural slope failures, a vast number ofpotential slope weakening and failure triggering factors ought to be considered. Especially forrather ancient slope failures, such factors can be difficult to identify and strongly depend on theregional to local climatic as well as seismo-tectonic context.An ex...
Seismic stability evaluation plays a crucial role in landslide disaster risk reduction. Related modeling also has to consider the potential influences of the rainfall on the hillslopes. This study aims at understanding the relative influence of the seismic loading and extreme cumulative rainfall on a massive active landslide in the seismically acti...
Origins of ancient rockslides in seismic regions can be controversial and must not necessarily be seismic. Certain slope morphologies hint at a possible co-seismic development, though further analyses are required to better comprehend their failure history, such as modelling the slope in its pre-failure state and failure development in static and d...
The stability of rock slopes is often guided by the structural geology of the rocks composing the slope. In this work, we analyse the influence of structural characteristics, and of their seismic response, on large and deep-seated rock slope failure development. The study is focused on the Tamins and Fernpass rockslides in the Alps and on the Balta...
The stability of rock slopes is often guided significantly by the structural geology of the rocks composing the slope. In this work, we analysed the influences of structural characteristics, and of their seismic responses, on large and deep-seated rock slope failure development. The study was focused on the Tamins and Fernpass rockslides in the Eur...
Assessing the geometry and volume of mass movements is essential for the appraisal of slope stability and for the understanding of slope failure trigger mechanisms. For the latter, we developed seismic ambient noise measurement techniques in order to better characterize the sub-surface of ancient deep-seated landslides in seismic regions, as in Car...
Assessing the geometry and volume of mass movements is essential for the appraisal of slope stability and for the understanding of slope failure trigger mechanisms. For the latter, we developed seismic ambient noise measurement techniques in order to better characterize the sub-surface of ancient deep-seated landslides in seismic regions, as in Car...
The mapping of internal structures of landslides is a challenging task. However, several investigation methods are commonly used to comprehend the interior of a slope. First, there is direct exploration, such as drilling and trenching, enabling a direct contact to the material of the subsoil. Secondly, there is indirect exploration comprising geoph...
The southeastern part of the Carpathian Mountains (region of Vrancea, Romania) is prone to high magnitude earthquakes (M>7) with deep hypocenters (60-200 km). It is known that the 1940 (M7.7) and 1977 (M7.2) Vrancea earthquakes induced several landslides. This region also presents numerous large slopes with morphologies which might be due to seismi...
Geophysical prospection methods facilitate near surface investigations, especially in complex or remote environments where direct exploration, such as drilling or trenching, are unfeasible or too expensive. Multiple techniques can be used for a vast number of survey targets in different study areas. However, on very large and heterogeneous
sites, s...
The task of characterising deep-seated mass movements in mountainous regions is challenging, especially if age and circumstances of the failure are unknown. In this work, we illustrate the potential of geophysical investigation methods on two old landslide bodies in the SE Carpathians and present integrated results in the form of high resolution 3D...
Geomorphological markers such as scarps, river diversions and slope failures can be used as proxy indicators for the seismotectonic activity of a region. This study concentrates on the Malmedy-Bévercé area, E-Belgium, where formerly unknown geomorphological features have been recently discovered in the frame of a new regional geological mapping cam...
As a geologist, you are always faced with one fundamental problem: the scales under which geology operates do not generally match well with those of humans. A geologist
cannot dissect the Earth to watch the tectonic plates shift and slide across the
mantle, they can’t peer inside a crystal as it forms and they can’t watch the full
saga of climate c...
As a geologist, you are always faced with one fundamental
problem: the scales under which geology operates do not generally match
well with those of humans. A geologist cannot dissect the Earth to watch the
tectonic plates shift and slide across the mantle, they can’t peer inside a crystal
as it forms and they can’t watch the full saga of climate c...
Geohazard research requires extensive spatiotemporal understanding
based on an adequate multi-scale representation of modelling results.
The most commonly applied representation basis for collected data is
still the one of a 2D plane, typically a map. Digital maps of spatial data
can be visualised and processed by using Geographic Information
Syste...
We will present a series of new integrated 3D models of landslide sites that were
investigated in distinctive seismotectonic and climatic contexts: (1) along the Hockai Fault
Zone in Belgium and (2) in the seismic region of Vrancea, Romania. Both sites are
deep-seated failures located in more or less seismically active areas. In such areas, slope
s...
This paper presents a series of new integrated 3D models of landslide sites that were investigated in very distinctive seismotectonic and climatic contexts in NW and SE Europe as well as in Central Asia (Tien Shan). First, we analyse ancient landslides with likely seismic origin marked by deep-seated failures, by a steep scarp and a massive failed...
We present a series of new integrated 3D models of landslide sites that were investigated in distinctive seismo-tectonic and climatic contexts:
(1) along the Hockai Fault Zone in Belgium, with the 1692 Verviers Earthquake (M ~ 6 - 6.5) as most prominent
seismic event that occurred in that fault zone, and
(2) in the seismic region of Vrancea, Rom...
In this application paper we'll explain the work flow we use to create immersive visualizations and spatial interaction for geophysical data with a head mounted device (HMD). The data that we analyze consists of two dimensional geographical map data and raw geophysical measurements with devices like seismometers, Electrical Resistivity Tomography (...
During several years, a series of geophysical surveys have been carried out in East Belgium to study the seismically active Hockai Fault Zone (HFZ). The most prominent earthquake that occurred in that fault zone is the 1692 Verviers Earthquake with a magnitude of M6-6.5; it is also the largest historical seismic event in NW Europe. The geomorphic i...
During several years, a series of geophysical surveys have been carried out in East Belgium to study the seismically active Hockai Fault Zone (HFZ). The most prominent earthquake that occurred in that fault zone is the 1692 Verviers Earthquake with a magnitude of M6-6.5; it is also the largest historical seismic event in NW Europe. The geomorphic i...