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Last name: VALLÉE
First name: M.
Bulletin of the Seismological Society of America, v. 97, n. 1A, p. S103-S114, 2007. http://dx.doi.org/10.1785/0120050616
Regional surface wave observations offer a powerful tool for determining source properties of large earthquakes, especially rupture velocity. Supershear ruptures, being faster than surface wave phase velocities, create far-field surface wave Mach cones along which waves from all sections of the fault arrive simultaneously and, over a...
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...
On October 31, 2002, a moderate size earthquake (Mw = 5.8) occurred in Molise region, southern Italy, causing loss of young human lives in a school collapse and destructions in several villages. The day after, a slightly smaller earthquake happened a few kilometers westward from the first one, without making strong damage. We use a complete set...
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...
Abstract: The Ganos fault is the westernmost segment of the North Anatolian Fault (NAF) that generated the 9 August 1912 Mürefte (Ganos) earthquake (Mw=7.4). We study the 1912 earthquake characteristics using co-seismic fault slip and fault segmentation coupled with an analysis of historical seismic records. Surface ruptures with small...
The eastern part of the French Mediterranean coast represents a moderate but sustained seismogenic region. This area comprises both the Alpine Arc and the Liguria See geological provinces. In the last half century, destructive earthquakes with intensities ranging between VII and IX have been experienced several times. Among them, the biggest...
Geophysical Research Letters, v. 30, n. 15, p. 1814, 2003. http://dx.doi.org/10.1029/2003GL017581
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...
International audience
Accurate and fast magnitude determination for large, shallow earthquakes is of key importance for post-seismic response and tsumami alert purposes. When no local real-time data are available, which is today the case for most subduction earthquakes, the first information comes from teleseismic body waves. Standard body-wave methods give accurate...
Recent observations of large continental strike-slip earthquakes show that different fault segments may rupture at different speeds and that rupture may propagate faster than the shear wave velocity of surrounding rocks. We report that all the documented occurrences of supershear rupture are associated with faults which have simple geometry....
In subduction zones, stress is released by earthquakes and transient aseismic slip. The latter falls into two categories: slow slip and afterslip. Slow-slip events emerge spontaneously during the interseismic phase, and show a progressive acceleration of slip with a negligible contribution of synchronous tremors or microseismicity to the...
The 11 March 2011 Mw9.0 Tohoku‐Oki earthquake was recorded by an exceptionally large amount of diverse data offering a unique opportunity to investigate the details of this major megathrust rupture. Many studies have taken advantage of the very dense Japanese onland strong motion, broadband, and continuous GPS networks in this sense. But...
Geophysical Research Letters, v. 31, p. L18607, 2004. http://dx.doi.org/10.1029/2004GL020687
We document a moderate earthquake in the French Alps (26 February 2012 Mw 4.1) that has been much more distinctly felt south of the event than north of it. This discrepancy was especially clear in the two large cities of Nice and Grenoble, both situated at 100 km from the epicenter. This observation was confirmed by ground-motion measurements...
We document a moderate earthquake in the French Alps (26 February 2012 Mw 4.1) that has been much more distinctly felt south of the event than north of it. This discrepancy was especially clear in the two large cities of Nice and Grenoble, both situated at 100 km from the epicenter. This observation was confirmed by ground-motion measurements...