A5018184913- earthquake and tectonic studies
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies
- Geological and Tectonic Studies in Latin America
- Geological and Geophysical Studies Worldwide
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Methane Hydrates and Related Phenomena
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Ultrasonics and Acoustic Wave Propagation
- Geophysical Methods and Applications
- Reservoir Engineering and Simulation Methods
- Atomic and Subatomic Physics Research
- Physical Education and Gymnastics
- Underwater Acoustics Research
- Geological Modeling and Analysis
- Geological Formations and Processes Exploration
Université de Strasbourg
2015-2025
Centre National de la Recherche Scientifique
2014-2025
Wabash College
2024
École & Observatoire des Sciences de la Terre
2002-2023
Observatoire astronomique de Strasbourg
2023
Institut Terre & Environnement de Strasbourg
2021-2023
Bureau de Recherches Géologiques et Minières
2023
California Institute of Technology
2000-2022
Terre des Hommes
2002-2022
The University of Tokyo
2022
A simple and unified approach is presented to solve both the elasto-dynamic elasto-static problems of point sources in a multi-layered half-space by using Thompson-Haskell propagator matrix technique. It shown that apparent incompatibility between two associated with degeneracy dynamic problem when ω = 0 can be handled uniformly Jordan canonical forms matrices. We re-derive matrices for static cases. then show solution converge their counterparts as → 0. Satisfactory deformation obtained...
We use interferometric synthetic aperture radar (InSAR) and Global Positioning System (GPS) observations to investigate static deformation due the 1999 M w 7.1 Hector Mine earthquake, that occurred in eastern California shear zone.Interferometric decorrelation, phase, azimuth offset measurements indicate regions of surface near-surface slip, which we constrain geometry rupture.The inferred is spatially complex, with multiple strands.The southern third rupture zone consists three subparallel...
New regional seismological data acquired in Colombia during 1993 to 1996 and tectonic field from the Eastern Cordillera (EC) permit a reexamination of complex geodynamics northwestern South America. The effect accretion Baudó‐Panama oceanic arc, which began 12 Myr ago, is highlighted connection with mountain building EC. Istmina Ibagué faults south Santa Marta‐Bucaramanga fault northeast limit an E‐SE moving continental wedge. Progressive indentation wedge absorbed along reverse located...
This note is devoted to the confrontation of intuitive ideas in field inverse problems, especially tomographic seismological studies, with results a more rigorous approach. With help simple example, we show that tests commonly used illustrate quality inversion can be misleading. Based on classical mathematical analysis, explain origin problems have seen. Our main conclusion that, circumstances not so unrealistic, and contradiction generally idea, small-size structures like 'checker-board...
W phase is a long period arriving before S wave. It can be interpreted as superposition of the fundamental, first, second and third overtones spheroidal modes or Rayleigh waves has group velocity from 4.5 to 9 km s−1 over range 100–1000 s. The amplitude better represents tsunami potential an earthquake. Because fast phase, most energy contained within short time window after arrival P At distance 50°, 23 min origin which distinct advantage using for rapid warning purposes. We use domain...
Rapid characterization of the earthquake source and its effects is a growing field interest. Until recently, it still took several hours to determine first-order attributes great (e.g. Mw≥ 7.5), even in well-instrumented region. The main limiting factors were data saturation, interference different phases time duration spatial extent rupture. To accelerate centroid moment tensor (CMT) determinations, we have developed inversion algorithm based on modelling W phase, very long period phase...
Abstract Source parameter scaling for major and great thrust‐faulting events on circum‐Pacific megathrusts is examined using uniformly processed finite‐fault inversions radiated energy estimates 114 M w ≥ 7.0 earthquakes. To address the limited resolution of source spatial extent rupture expansion velocity ( V r ) from teleseismic observations, are subdivided into either group 1 (18 events) having independent constraints prior studies or 2 (96 lacking constraints. For 2, with = 2.0, 2.5, 3.0...
We investigate the relation between a static scaling relation, M 0 (seismic moment) versus f (spectral corner frequency), and dynamic E R (radiated energy).These two relations are not independent.Using variational calculus, we show that ratio e ס˜ /M has lower bound, ˜min , for given .If commonly used (M ϰ ) 3מ holds, then must be scale independent should depend on magnitude, w .The observed values of ˜for large earthquakes [e.g., ˜(M 7)] close to small controversial, but reported 3)...
The southwestern half of a ∼500 km long seismic gap in the central Kuril Island arc subduction zone experienced two great earthquakes with extensive preshock and aftershock sequences late 2006 to early 2007. nature coupling had been uncertain due limited historical record prior large events presence distinctive upper plate, trench outer rise structures relative adjacent regions along that have repeated interplate last few centuries. intraplate region seaward several shallow compressional...
Research Article| September 01, 2009 Source Inversion of the W-Phase: Real-time Implementation and Extension to Low Magnitudes Gavin P. Hayes; Hayes U.S. Geological Survey National Earthquake Information Center P.O. Box 25046, MS 966 Denver, Colorado 80225 U.S.A. ghayes@usgs.gov (G. H.) 1U.S. Survey, (contracted by Synergetics, Inc.), Golden, Search for other works this author on: GSW Google Scholar Luis Rivera; Rivera 2Institut de Physique du Globe Strasbourg, France Hiroo Kanamori...
Abstract The 27 February 2010, M w 8.8 Maule earthquake ruptured ~500 km along the plate boundary offshore central Chile between 34°S and 38.5°S. Establishing whether coseismic fault offset extended to trench is important for interpreting both shallow frictional behavior potential tsunami earthquakes in region. Joint inversion of high‐rate GPS, teleseismic body waves, interferometric synthetic aperture radar (InSAR), campaign observations yields a kinematic rupture model with improved...
Abstract The subduction zone in northern Chile is a well‐identified seismic gap that last ruptured 1877. On 1 April 2014, this region was struck by large earthquake following two week long series of foreshocks. This study combines wide range observations, including geodetic, tsunami, and data, to produce reliable kinematic slip model the M w =8.1 main shock static =7.7 aftershock. We use novel Bayesian modeling approach accounts for uncertainty Green's functions, both dynamic, while avoiding...
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...
Rapid quantification of the Anak Krakatau landslide by regional seismic data could have aided in warning resulting tsunami.
Climate change is increasingly predisposing polar regions to large landslides. Tsunamigenic landslides have occurred recently in Greenland ( Kalaallit Nunaat ), but none been reported from the eastern fjords. In September 2023, we detected start of a 9-day-long, global 10.88-millihertz (92-second) monochromatic very-long-period (VLP) seismic signal, originating East Greenland. this study, demonstrate how event started with glacial thinning–induced rock-ice avalanche 25 × 10 6 cubic meters...
This paper is devoted to the simultaneous determination of coseismic and postseismic gravitational changes caused by great 2004 December 26 Sumatra–Andaman earthquake from time-variable global gravity fields recovered Gravity Recovery And Climate Experiment (GRACE) mission. Furthermore, a complete modelling elasto-gravitational response self-gravitating, spherically layered, elastic earth model carried out using normal-modes summation for comparison with observed change. Special attention...
The real time W phase source inversion algorithm was independently running at three organizations (USGS, PTWC and IPGS) the of 2011 off Pacific coast Tohoku Earthquake. Valuable results for tsunami warning purposes were obtained 20 min after event origin time. Within next hour, as more data became available, solutions improved, converged to a common result (Mw ≈ 9.0, dip 14°). A post-mortem analysis using selection based on pre-event noise confirmed Mw = 9.0 yielded best double couple given...
Source inversion is a widely used practice in seismology. Magnitudes, moment tensors, slip distributions are now routinely calculated and disseminated whenever an earthquake occurs. The accuracy of such models depends on many aspects like the event magnitude, data coverage quality (instrument response, isolation, timing, etc.). Here, any observational problem, error estimation should be part solution. It however very rare to find source algorithm which includes realistic analyses, solutions...
Brief Report| March 25, 2014 The 2013 Mw 7.7 Balochistan Earthquake: Seismic Potential of an Accretionary Wedge R. Jolivet; Jolivet aSeismological Laboratory, Department Geological and Planetary Sciences, California Institute Technology, 1200 E Blvd, Pasadena, 91125 Search for other works by this author on: GSW Google Scholar Z. Duputel; Duputel *Now at Institut de Physique du Globe Strasbourg, UdS EOST/CNRS UMR 7516, France. B. Riel; Riel M. Simons; Simons L. Rivera; Rivera cInstitut France...