A5060771817- Planetary Science and Exploration
- earthquake and tectonic studies
- Geological and Geophysical Studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Astro and Planetary Science
- Geophysics and Sensor Technology
- Geological formations and processes
- Space Exploration and Technology
- Geochemistry and Geologic Mapping
- Seismology and Earthquake Studies
- Geology and Paleoclimatology Research
- Earthquake Detection and Analysis
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Geological Modeling and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Marine and fisheries research
- Oceanographic and Atmospheric Processes
- Marine animal studies overview
- Coral and Marine Ecosystems Studies
- Landslides and related hazards
- Underwater Acoustics Research
Institut de physique du globe de Paris
2019-2022
Université Paris Cité
2019-2022
Centre National de la Recherche Scientifique
2020-2022
Dublin Institute For Advanced Studies
1993-2006
Karlsruhe Institute of Technology
1998-2000
Institute of Geological Sciences
1970-1972
Institute of Seismology
1972
University of California, Los Angeles
1960
High Altitude Observatory
1960
NSF National Center for Atmospheric Research
1960
Abstract Since February 2019, NASA's InSight lander is recording seismic signals on the planet Mars, which, for first time, allows to observe ongoing tectonic processes with geophysical methods. A number of Marsquakes have been located in Cerberus Fossae graben system Elysium Planitia and further west, Orcus Patera depression. We present a study focal mechanisms three well‐recorded events (S0173a, S0183a, S0235b) determine dominating source region. infer all predominantly extensional...
Abstract Seismic noise recorded at the surface of Mars has been monitored since February 2019, using InSight seismometers. This can reach −200 dB. It is 500 times lower than on Earth night and it increases 30 dB during day. We analyze its polarization as a function time frequency in band 0.03–1 Hz. use degree to extract signals with stable independent their amplitude type polarization. detect polarized all frequencies times. Glitches correspond linear which are more abundant night. For...
The NASA InSight mission to Mars successfully landed on 26 November 2018 in Elysium Planitia. It aims characterize the seismic activity and aid understanding of internal structure Mars. We focus Cerberus Fossae region, a giant fracture network ∼1,200 km long situated east landing site where M ∼3 marsquakes were detected during past 2 years. is formed five main fossae located southeast Mons volcanic rise. perform detailed mapping entire system based high-resolution satellite images Digital...
Abstract The NASA InSight mission on Mars is a unique opportunity to study atmospheric processes both from orbit and in situ observations. We use post‐landing high‐resolution satellite images monitor dust devil activity during the first 8 months of mission. perform mapping semiautomatic detection newly formed tracks analyze their characteristics (sizes, azimuths, distances, directions motion). find large number appearing shortly after landing, followed by significant decrease late winter,...
The Porcupine, Rockall and Hatton–Rockall basins lie on the continental seaboard west of Ireland. Up to 9 km Cretaceous Tertiary strata are preserved in Porcupine Basin, contrast 2–3 basins. Differences seismic stratigraphic sequences through region attributed an interplay between developing North Atlantic Ocean, post-rift thermal subsidence sea-level changes. Localized Ryazanian fault-controlled alluvial fan clastic rocks Basin succeeded by Valanginian Barremian marine deposits. Sea-level...
The crustal structure along the axis of Rockall Trough, in North Atlantic, has been studied a 600‐km refraction/wide‐angle reflection transect, containing three lines each 200 to 250 km long, using explosives and ocean bottom seismometers. One‐dimensional inversions section were made τ – p method forward modeling observed travel times. In next stage, times amplitudes modeled ray tracing techniques through two‐dimensional heterogeneous structures. results indicate that there are sedimentary...
Results from a wide‐angle seismic and gravity study between the Rockall Bank Iceland Basin in North Atlantic are presented. Crustal sedimentary structures resolved Hatton across continental margin (HCM) east of magnetic anomaly 24. The structure oceanic crust west is also determined. Gravity data support model areas good coverage used to control where poor. A two‐layer sequence present both margin. lower layer, with P wave velocity about 4 km/s, interpreted as pre‐Eocene synrift sediments up...
Evidence from wide-angle seismic data in the Irish sector of Rockall Trough suggests that basin is underlain by thinned continental crust which has undergone differential stretching. The upper been a stretching factor 8–10 while middle and lower (and probably also lithospheric mantle) was stretched 2–3. latter figure suggested as being representative overall Crustal modelling fails to demonstrate any significant effect Iceland plume on development basin. contains up 6 km sedimentary strata....
We employ P to S converted waveforms investigate effects of the hot mantle plume on seismic discontinuities crust and upper mantle. observe Moho at depths between 13 17 km, regionally covered by a strong shallow intracrustal phase. Coherent phases transverse component indicate either dipping interfaces, 3-D heterogeneities or lower crustal anisotropy. find anomalies related in down transition zone evidently plume. Lithospheric thinning is confirmed greater detail than previously reported Li...
The rate of occurrence High Frequency (HF) marsquakes, as recorded by InSight at Homestead Hollow, Elysium Planitia, increased after about LS=33∘, and ceased almost completely LS=187∘, following an apparently seasonal variation with a peak near aphelion. We define seismic models based on the declination Sun, annual solar tides, CO2 cycle measured atmospheric pressure. Evaluation Akaike weights evidence ratios shows that Sun is most likely, least likely driver this activity, although...
The paper describes a radio-linked short-period seismometer network now operating in Scotland and recording on analogue magnetic tape. will be used as permanent for time-term refraction studies, monitoring the minor seismic activity within area. tapes may digitized laboratory, processed computer, an array of 100-km aperture. aperture allows fine resolution between beams determining apparent velocity azimuth teleseisms.
VARNET, an international multidisciplinary project, was designed to examine the 'Variscan Front' in southwest of Ireland. As part seismic experiment a 200 km long wide-angle profile (Line A) recorded from Old Head Kinsale south Ireland Galway Bay on west coast. Along Line A, 170 stations were deployed at approximately 1 intervals. Results ray trace modelling indicate multilayered crust. The upper crust, extending depth about 14 km, is laterally variable. South Shannon Estuary sedimentary...