DELOUIS , B.

Lorsqu'un séisme est détecté et localisé en temps réel par seiscomp3 à Géoazur, un calcul automatique du mécanisme au foyer par inversion des formes d'ondes est déclenché si la magnitude locale (Ml) atteint un certain seul et que le séisme se situe dans une aire géographique prédéfinie. Le seuil est Ml=2,5 pour le domaine métropolitain et les...

The FMNEAR method is based on both the waveform inversion of near-source seismic records and on a linear finite-source model. The primary source param-eters that are determined are the moment magnitude (Mw), the double-couple focalmechanism (strike, dip, and rake), and the distribution of seismic moment along strike,which provides a first-order...

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The kinematic rupture of the L'Aquila earthquake on the Paganica fault is reassessed with a highly comprehensive set of data. This very complete dataset is also used to explore the possibility that secondary faults may be involved in the coseismic process. The main characteristics of the slip distribution of the Paganica normal fault found by...

Geophysical Research Letters, v. 34, n. 10, p. L01304, 2007. http://dx.doi.org/10.1029/2006GL028193

Tectonophysics, v. 467, n. 1-4, p. 22-34, 2009. http://dx.doi.org/10.1016/j.tecto.2008.12.013

Bulletin of the Seismological Society of America, v. 95, n. 5, p. 1825-1840, 2005. http://dx.doi.org/10.1785/0120040230

Seismic moment and the corresponding moment magnitude Mw are classically obtained from the spectrum of far-field body waves. Near-field records are generally not used for that purpose, particularly in the case of large earthquakes because different types of wave arrive simultaneously, preventing the definition of a simple relation between the...

Using waveform data gathered from the different organizations that operate seismological networks in the Pyrenees, we have obtained a complete moment tensor catalog of Pyrenean earthquakes with magnitude larger than 3 covering the time period 2001-2011. Our moment tensor solutions are in good agreement with those previously reported by other...

The seismological study of recent seismic crises near Oleron Island confirms the coexistence of an extensional deformation and a transtensive regime in the Atlantic margin of France, which is different from the general western European stress field corresponding to a strike-slip regime. We argue that the switch of the principal stress axes...

We present a modified version of the FMNEAR method for determining the focal mechanisms and fault plane geometries of small earthquakes. Our improvements allow determination of the fault plane and dimensions using the near-field components of only a few local records. The limiting factor is the number of stations: a minimum of five to six...

The shallow depth underthrust earthquake of February 27, 2010 (Mw 8.8) ruptured the subduction plate interface in central Chile between 34°S and 38°S. We retrieve the spatial and temporal distribution of slip during this mega-earthquake through a joint inversion of teleseismic records, InSAR and High Rate GPS (HRGPS) data. Additionally, our...

The 2003 Chengkung earthquake (Mw 6.8) occurred on the east-dipping Chihshang fault of eastern Taiwan, a listric fault with dominant reverse motion. A joint inversion taking into account geodetic (GPS) and seismological (accelerometric and teleseismic) data is performed. This modelling highlights the rupture process behaviour on the fault plane...

Bulletin of the Seismological Society of America, v. 94, n. 6, p. 2015-2027, 2004. http://dx.doi.org/10.1785/0120030038

The validity and the stability of a ground-motion simulation method based on the recordings of a single small event as an empirical Green's function (EGF) is tested on a seismic crisis that occurred 25 km offshore of the Guadeloupe Islands (Caribbean arc). We aim to determine if (1) the method enables us to reproduce the observed ground motion,...

Abstract. Despite the occurrence of several large earthquakes during the last decade, Chile continues to have a great tsunamigenic potential. This arises as a consequence of the large amount of strain accumulated along a subduction zone that runs parallel to its long coast, and a distance from the trench to the coast of no more than 100 km....

Bulletin of the Seismological Society of America, v. 92, n. 1, p. 278-299, 2002. http://dx.doi.org/10.1785/0120000806

The strong development of tsunami instrumentation in the past decade now provides observations of tsunami wave propagation in most ocean basins. This evolution has led to the wide use of tsunami data to image the complexity of earthquake sources. In particular, the 2011 Mw9.0 Tohoku-Oki earthquake is the first mega-event for which such a...

We conducted a palaeoseismic study with geomorphologic mapping, geophysical prospecting and trenching along an 8-km-long NNE-SSW trending fault scarp south of Basel. The city as well as 40 castles within a 20-km radius were destroyed or heavily damaged by the earthquake of 1356 October 18 (Io = IX-X), the largest historical seismic event in...

Bulletin of the Seismological Society of America, v. 99, p. 87-94, 2009. http://dx.doi.org/10.1785/0120080192

The space-time distribution of coseismic slip of the 2011 February 21, Mw 6.2, Christchurch earthquake, New Zealand, is explored, differently from all previous studies, through a joint inversion of geodetic and strong-motion data. The geodetic data consist of both global position system (GPS), from campaign and continuous stations, and...

Tectonophysics, v. 466, n. 3-4, p. 409-426, Tectonophysics, 2007. http://dx.doi.org/10.1016/j.tecto.2007.11.003

The initiation and the initial evolution of a strike-slip fault are modeled within an elastoplasticity constitutive framework taking into account the evolution of the hardening modulus with inelastic straining. The initial and boundary conditions are similar to those of the Riedel shear experiment. The models first deform purely elastically....

In this paper, we obtain an accurate estimation of the rupture velocity of the 6 April 2009 Mw 6.3 L'Aquila earthquake (Central Apennines) by analyzing its apparent source time functions (ASTFs). These ASTFs have been extracted by deconvolving an empirical Green's function (EGF) at seismic stations located 200-800 km from the earthquake. From...