A5029907635- earthquake and tectonic studies
- Geological and Tectonic Studies in Latin America
- Geological and Geophysical Studies
- Geological and Geochemical Analysis
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Geological and Geophysical Studies Worldwide
- Reservoir Engineering and Simulation Methods
- Seismic Imaging and Inversion Techniques
- Tropical and Extratropical Cyclones Research
- Earthquake and Tsunami Effects
- GNSS positioning and interference
- Geology and Paleoclimatology Research
- Coastal and Marine Dynamics
- Geotechnical and Geomechanical Engineering
- Geophysics and Gravity Measurements
- Statistical and numerical algorithms
- Drilling and Well Engineering
- Botany and Geology in Latin America and Caribbean
- Geological Modeling and Analysis
- Seismic Waves and Analysis
- Geochemistry and Geologic Mapping
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Seismic Performance and Analysis
Centre National de la Recherche Scientifique
2004-2024
Institut de Recherche pour le Développement
2010-2024
Institut des Sciences de la Terre
2018-2024
Université Savoie Mont Blanc
2020-2024
Université Gustave Eiffel
2020-2024
Université Grenoble Alpes
2021-2024
Université Côte d'Azur
2011-2017
Géoazur
2011-2017
Observatoire de la Côte d’Azur
2011-2017
California Institute of Technology
2006-2008
Continuously recording Global Positioning System stations near the 28 March 2005 rupture of Sunda megathrust [moment magnitude (Mw) 8.7] show that earthquake triggered aseismic frictional afterslip on subduction megathrust, with a major fraction this slip in up-dip direction from main rupture. Eleven months after shock, continues at rates several times average interseismic rate, resulting deformation equivalent to least M(w) 8.2 earthquake. In general, along-strike variations behavior appear...
Abstract We determine coseismic and the first-month postseismic deformation associated with Sumatra–Andaman earthquake of 26 December 2004 from near- field Global Positioning System (gps) surveys in northwestern Sumatra along Nicobar-Andaman islands, continuous campaign gps measurements Thailand Malaysia, situ remotely sensed observations vertical motion coral reefs. The model shows that Sunda subduction megathrust ruptured over a distance about 1500 km width less than 150 km, releasing...
Geodetic and paleogeodetic measurements of interseismic strain above the Sumatran portion Sunda subduction zone reveal a heterogeneous pattern coupling. Annual banding in corals provides vertical rates deformation spanning last half 20th century, repeated GPS surveys between 1991 2001 continuous at stations operated since 2002 provide horizontal velocities. Near equator, megathrust is locked over narrow width only few tens kilometers. In contrast, fault up to about 175 km wide areas where...
Large uplifts and tilts occurred on the Sumatran outer arc islands between 0.5° 3.3°S during great historical earthquakes in 1797 1833, as judged from relative sea level changes recorded by annually banded coral heads. Coral data for these two are most complete along a 160‐km length of Mentawai 3.2° 2°S. Uplift there was 0.8 m 2.8 1833. extended 370 km, 0.5°S. The pattern magnitude uplift imply megathrust ruptures corresponding to moment magnitudes ( M w ) range 8.5 8.7. region 1833 ranges...
[1] We use about two decades of geodetic measurements to characterize interseismic strain build up along the Central Andes subduction zone from Lima, Peru, Antofagasta, Chile. These are modeled assuming a 3-plate model (Nazca, Andean sliver and South America Craton) spatially varying coupling (ISC) on Nazca megathrust interface. also determine slip models 1996 Mw = 7.7 Nazca, 2001 8.4 Arequipa, 2007 8.0 Pisco Tocopilla earthquakes. find that data require highly heterogeneous ISC pattern...
Abstract We document a 1 week long slow slip event (SSE) with an equivalent moment magnitude of 6.0–6.3 which occurred in August 2010 below La Plata Island (Ecuador), south the rupture area 1906 Mw = 8.8 megathrust earthquake. GPS data reveal that SSE at depth about 10 km, within downdip part shallow (<15 km), isolated, locked patch along subduction interface. The availability both broadband seismometer and continuous geodetic station located Island, km above SSE, enables careful analysis...
Measurement of interseismic strain along subduction zones reveals the location both locked asperities, which might rupture during megathrust earthquakes, and creeping zones, tend to arrest such seismic ruptures. The heterogeneous pattern coupling presumably relates spatial variations frictional properties interface may also show up in fore-arc morphology. To investigate this hypothesis, we compiled information on extent earthquake ruptures for last 500 years uplift rates derived from dated...
Abstract Over 100 GPS sites measured in 2008–2013 Peru provide new insights into the present‐day crustal deformation of 2200 km long Peruvian margin. This margin is squeezed between eastward subduction oceanic Nazca Plate at South America trench axis and westward continental American beneath Eastern Cordillera Subandean orogenic wedge. Continental active faults data reveal rigid motion a Forearc Sliver that extends from to Western‐Eastern Cordilleras boundary moves southeastward 4–5 mm/yr...
The different phases of the earthquake cycle can produce measurable deformation Earth′s surface. This work is aimed at describing evolution that in space and time, as well distribution causal slip on fault depth. We have applied GPS synthetic aperture radar (SAR) interferometry (InSAR) techniques to northern Chile, where fast plate convergence rates are associated with large subduction earthquakes extensive crustal deformation. region Chile between 18°S 23°S one most important seismic gaps...
A long section of the Sunda megathrust south great tsunamigenic earthquakes 2004 and 2005 is well advanced in its seismic cycle a plausible candidate for rupture next few decades. Our computations tsunami propagation inundation yield model flow depths inundations consistent with sparse historical accounts last there, 1797 1833. Numerical results from future ruptures produce several meters up to kilometers inland near most populous coastal cities. models tsunamis confirm substantial exposure...
Abstract Whether subducted oceanic reliefs such as seamounts promote seismic rupture or aseismic slip remains controversial. Here we use swath bathymetry, prestack depth‐migrated multichannel reflection lines, and wide‐angle data collected across the central Ecuador subduction segment to reveal a broad ~55 km × 50 km, ~1.5–2.0 high, low height‐to‐width ratio, multipeaked, sediment‐bare, shallow relief. Owing La Plata Island coastline being located, respectively, ~35 ~50–60 from trench, GPS...
The geomorphology and internal stratigraphy of modern coral microatolls show that all the outer arc Mentawai islands West Sumatra have been subsiding over past several decades. These same rose as much 3 m during giant megathrust earthquakes 1797 1833, current subsidence probably reflects strain accumulation will lead to future large earthquakes. Average rates half century vary from 2 14 mm yr −1 increase southwestward, toward subduction trench. pattern is consistent with measured by a sparse...
Abstract We analyzed the coseismic and early postseismic deformation of 2015, M w 8.3 Illapel earthquake by inverting 13 continuous GPS time series. The seismic rupture concentrated in a shallow (<20 km depth) 100 long asperity, which slipped up to 8 m, releasing moment 3.6 × 10 21 Nm ( = 8.3). After 43 days, afterslip encompassed rupture. Afterslip two main patches 0.50 m between 20 40 depth along northern southern ends rupture, partially overlapping slip. aftershocks confined region...
Abstract Characterizing the time evolution of slip over different phases seismic cycle is crucial to a better understanding factors controlling occurrence large earthquakes. In this study, we take advantage interferometric synthetic aperture radar data and 3.5 years continuous Global Positioning System (GPS) measurements determine interseismic, coseismic, postseismic distributions in region 2007, M w 8.0 Pisco, earthquake, Peru, using same fault geometry inversion method. Our interseismic...
The 2011 moment magnitude ( M w) 9.0 Tohoku‐Oki Japan earthquake occurred in a region where giant megathrust earthquakes were not expected. This proved the difficulty assessing seismic hazard by relying mainly on information from historical and instrumental seismicity. To help improve seismic‐hazard assessment for such rare events, we propose methodology to estimate slip distribution of future based model interseismic coupling subduction margins, as well earthquakes, apply method central...
On November 11, 2019, a M w 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on eastern margin of Massif Central external part Alps. Occuring in moderate seismicity area, this is remarkable for its very shallow focal depth (between 1 and 3 km), magnitude, large damages it produced several villages. InSAR interferograms indicated rupture about 4 km long reaching surface reactivation ancient NE–SW La Rouvière normal fault reverse faulting agreement with...
We present preliminary results of the analysis interseismic coupling at southern Peru subduction zone, with special focus on Nazca Ridge and fracture zone. This study is based GPS data from over 120 permanent field stations collected during last decade. The obtained velocity shows current state deformation Peruvian margin. inversion geodetic displacements allowed us to estimate plate interface. Our show that heterogeneous, two areas significant low weak coefficient, one located ridge other...
Abstract The Central Andes subduction has been the theater of numerous large earthquakes since beginning 21st Century, notably 2001 M w = 8.4 Arequipa, 2007 8.0 Pisco and 2014 8.1 Iquique earthquakes. We present an analysis 47 permanent 26 survey global navigation satellite system (GNSS) measurements acquired in Central‐South Peru between 2022 to better understand frictional properties megathrust interface. Using a trajectory model that mimics different phases cycle, we extract coherent...