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Seismic response of the crust to stress changes
Univ Europeenne - EAN : 9786131510144
Édition papier
EAN : 9786131510144
Paru le : 5 août 2010
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- EAN13 : 9786131510144
- Réf. fournisseur : 4629265
- Editeur : Univ Europeenne
- Date Parution : 5 août 2010
- Disponibilite : Disponible
- Barème de remise : NS
- Nombre de pages : 192
- Format : H:220 mm L:150 mm
- Poids : 290gr
- Interdit de retour : Retour interdit
- Résumé : We present an analysis of seismicity rate variations during doublets of large earthquakes. We focus on aftershocks localized in the vicinity of the 1st mainshock rupture zone in order to investigate how the 2nd one modifies this activity. We studied two particular doublets: the Izmit-Düzce sequence in 1999, and the icelandic doublet of June 2000. This led us to conclude that triggering of activity after the 2nd mainshocks of doublets can take place in regions that did not undergo static stress loading, with a preference for those linked with geothermal activity. The temporal decay of these reactivations does not systematically follow the Omori law, as quiescences may appear after a delay of days to months. We also studied global properties of earthquake doublets and showed that doublets may simply be described with usual laws of seismicity (i.e., Omori-Utsu and Gutenberg-Richter laws). Finally, average aftershock production following 2nd mainshocks of doublets appears to be equivalent to the superposition of two typical aftershock production following single mainshocks, contrary to observations from regional studies.
- Biographie : Former student of the Engineering School in Earth Physics (EOST),Strasbourg, France, the author conducted this reasearch projectat the laboratory of geophysics (LGIT) of Grenoble University,France. Since 2008, he acts as an assistant-professor inseismology at the laboratory "Chrono-Environnement", Universityof Franche-Comté, Besançon, France.
