A5031889129- earthquake and tectonic studies
- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Geological and Geochemical Analysis
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Landslides and related hazards
- Geological Modeling and Analysis
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Geological and Geophysical Studies Worldwide
- Geophysical and Geoelectrical Methods
- Geological Formations and Processes Exploration
- Hydrology and Sediment Transport Processes
- Geochemistry and Geologic Mapping
- Underwater Acoustics Research
- Geophysical Methods and Applications
- Drilling and Well Engineering
- Geology and Paleoclimatology Research
- Geophysics and Sensor Technology
- Telecommunications and Broadcasting Technologies
- Satellite Communication Systems
- Geological Studies and Exploration
Centre National de la Recherche Scientifique
2011-2024
Université de Strasbourg
2010-2024
Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)
2021-2024
École & Observatoire des Sciences de la Terre
2012-2023
Institut des Sciences de la Terre
2010-2023
Université Côte d'Azur
2021
Université de Montpellier
2021
Académie de Paris
2021
Institut de physique du globe de Paris
2009-2018
Institut de Physique
2002-2014
We studied the formation of Himalayan mountain range and Tibetan Plateau by investigating their lithospheric structure. Using an 800-kilometer-long, densely spaced seismic array, we have constructed image crust upper mantle beneath Himalayas southern Plateau. The reveals in a continuous fashion Main thrust fault as it extends from shallow depth under Nepal to mid-crust Tibet. Indian can be traced 31 degrees N. crust/mantle interface Tibet is anisotropic, indicating shearing during its...
Seismic background noise dramatically decreased as a result of lockdown measures in place for mitigating the spread COVID-19.
Crustal receiver functions (RFs) computed from the records of 45 temporary seismological stations installed on a 620-km-long profile across central Zagros provide first direct evidence for crustal thickening in this mountain belt. Due to rather short 14 km average station spacing, migrated section radial RFs displays Moho depth variations belt with good spatial resolution. From coast Persian Gulf 25 southwest Main Thrust (MZT), is almost horizontal slight around km. thickness then increases...
Analysis of continuous seismic data recorded by a dense passive seismological network (Hi‐CLIMB) installed across the Himalayas reveals strong spatial and temporal variations in ambient energy produced at high frequencies (>1 Hz). From June to September 2003, high‐frequency noise is observed increase up 20 dB (relative (m/s) 2 /Hz) for all stations located along steep 30‐km‐long narrow deeply incised channel Trisuli River, major trans‐Himalayan river. The early summer modulated 24‐h...
Abstract The 2015 Gorkha earthquake sequence provides an outstanding opportunity to better characterize the geometry of Main Himalayan Thrust (MHT). To overcome limitations due unaccounted lateral heterogeneities, we perform Centroid Moment Tensor inversions in a 3‐D Earth model for main shock and largest aftershocks. In parallel, recompute S ‐to‐ P receiver functions from Hi‐CLIMB data set. Inverted centroid locations fall within low‐velocity zone at 10–15 km depth corresponding...
Beneath the Tibet plateau, deficit of crustal thickening with respect to what is expected from plate tectonic constraints thought be absorbed either by lateral extrusion or vertical rock-mass transfer. To nourish unsettled debate relative importance these two processes, we propose a new approach, based on S-to-P and P-to-S wave conversions, enabling precise determination seismic velocities. The weighted amplitudes direct conversion reverberations are stacked at their predicted arrival times...
Abstract In September 2014, a dense temporary seismic network (EstOF) including 288 single‐component geophones was deployed during 1 month in the Outre‐Forêt region of Upper Rhine Graben (France), where two deep geothermal projects (Soultz‐sous‐Forêts and Rittershoffen) are currently operation. We apply ambient noise correlation to estimate empirical Green's function medium between ~41,200 station pairs network. The functions obtained comparable those from previous studies based on sparse...
SUMMARY The brutal onset of seismicity offshore Mayotte island North the Mozambique Channel, Indian Ocean, that occurred in May 2018 caught population, authorities and scientific community off guard. Around 20 potentially felt earthquakes were recorded first 5 d, up to magnitude Mw 5.9. had little pre-existing knowledge seismic activity region due poor network coverage. During 2019, MAYOBS/REVOSIMA seismology group was progressively built between four French research institutions improve...
Between November 2019 and January 2021, a series of seismic events were felt by the population city Strasbourg, France. The first main event (MLv 3.0) that occurred on 12, 2019, was part swarm (the southern cluster) has been initiated few days before, lasted four months, located BCSF-Rénass (EOST), below La Robertsau area at depth 5 km. Its location in vicinity deep geothermal wells (Geoven), temporal correlation with injection activity site, similarity between bottom hypocenter event, lack...
The range and the meaning of effective elastic thickness (EET) in continental areas have been subject to controversy over last two decades. Here we take advantage new data set from Hi-CLIMB seismological experiment re-estimate EET India Plate along a south–north profile extending Ganges basin central Tibet. Receiver functions give high-resolution image base foreland at ∼5 km depth constrain crustal thickness, which increases northwards ∼35 beneath indo-gangetic plain ∼70 southern Together...
During the 2003 summer monsoon, Hi‐CLIMB seismological stations deployed across Himalayan Range detected bursts of high‐frequency seismic noise that lasted several hours to days. On basis cross correlation envelopes recorded at 11 stations, we show largest transient event on 15 August was located nearby a village partially destroyed day by devastating debris flow. This consistency in both space and time suggests analysis can be used monitor flow generation as well evacuation sediment. A...
Abstract. Landscape dynamics are determined by interactions amongst geomorphic processes. These allow the effects of tectonic, climatic and seismic perturbations to propagate across topographic domains, permit impacts process events radiate from their point origin. Visual remote sensing in situ observations do not fully resolve spatiotemporal patterns surface processes a landscape. As result, mechanisms scales connectivity poorly understood. Because many emit signals, seismology can...
We present a comprehensive model of lithospheric structure extending to 300 km beneath France, derived from joint inversion teleseismic, gravity, and gradiometry datasets. Our analysis incorporates 27,935 relative travel time residuals sourced the 193 French permanent seismic stations (EPOS-France), alongside 30,351 terrestrial gravity measurements complete gradient tensor GOCE satellite mission. The integration these three complementary datasets enhances our understanding structures. method...
Ambient seismic noise interferometry is a powerful tool to monitor changes in velocities within the upper crust induced by various forcings. Several studies have shown that dynamics of aquifers can generate significant velocity variations, concealing more subtle variations linked other phenomena. Here, we present temporal and spatial analysis subsurface over portion Upper Rhine Graben north-eastern France, hosting one largest watertable Europe. We analyze 4 years continuous records between...
Abstract The crustal structure of Western Nepal is studied for the first time by performing receiver function analysis on teleseismic waveforms recorded at 16 seismic stations. Moho geometry imaged as it deepens from ~40‐km depth beneath foothills and Lesser Himalaya to ~58‐km Higher Himalayan range. A midcrustal low‐velocity zone detected ~15‐km along ~55‐km horizontal distance interpreted signature fluids expelled rocks descending in footwall Main Thrust. Our new image allows structural...
We developed and applied a method for ambient noise surface wave tomography that can deal with cross-correlation functions governed to first order by non-uniform distribution of the seismic sources. The inverts azimuthal sources are assumed be far from network, together spatial variations phase group velocities on an optimized irregular grid. Direct modelling two-sided correlation avoids dispersion curve picking every station pair minimizes analyst intervention. involves pairs spaced...
We extend the use of noise correlation functions (NCFs) to locate stream segments trans-Himalayan Trisuli River that are responsible for large high-frequency seismic observed at Hi-CLIMB stations. Cross-correlations continuous records several pairs stations indicate some sources coherent only during monsoon period. To these sources, we perform a migration selection NCF envelopes filtered frequencies ranging from 2 6 Hz. produce set coherence maps each frequency and various apparent...
Abstract Low-velocity zones (‘bright spots’) imaged by the INDEPTH seismic experiment in southern Tibet are extensively interpreted as widespread partial melt within crust, which has given a strong support for channel flow model. These suggest that continuous low-velocity zone underlies on large scale. Here we take advantage of Hi-CLIMB includes dense south–north profile and lateral 2D network to assess vertical horizontal extension Tibet. Several approaches including migration, amplitude...