GEOSCAN, résultats de la recherche


TitreThe importance of ground-truthing for earthquake site response
AuteurCassidy, J F; Mucciarelli, M
SourceProceedings of the 9th U.S. National and 10th Canadian Conference on Earthquake Engineering/Compte Rendu de la 9ième Conférence Nationale Américaine et 10ième Conférence Canadienne de Génie Parasismique; 758, 2010, 10 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090277
Réunion9th US/10th Canadian Joint Conference on Earthquake Engineering; Toronto, ON; CA; juillet 25-29, 2010
Référence reliéeCette publication est contenue dans Adams, J; Halchuk, S; Awatta, A; Adams, J; Halchuk, S; Awatta, A; (2010). Estimated seismic design values for Canadian missions abroad, Proceedings of the 9th U.S. National and 10th Canadian Conference on Earthquake Engineering
Sujetssecousses séismiques; risque de tremblement de terre; études séismiques; mécanismes de tremblement de terre; dégât causés par les tremblements de terre; design à l'épreuve des tremblements de terre; géophysique
Illustrationshistograms; plots; graphs
ProgrammeÉvaluations ciblées des dangers dans l'Ouest du Canada, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
One of the primary goals of earthquake research is to better estimate ground shaking during future earthquakes. To that end, earthquake site response studies are becoming increasingly popular around the world. In many cases, detailed "seismic microzonation" maps are being generated based strictly on measurements of the average shear-wave velocity of the upper 30 m (Vs30). In this article, we document the importance of ground-truthing such maps by summarising some lessons learned from large earthquakes and recent earthquake site response studies that utilise earthquake recordings from dense seismic networks (e.g., Japan, California, Taiwan) and ambient noise measurements. Large earthquakes around the world remind us that while soft soils generally amplify shaking, it is not a straightforward problem. Since the mid-1990's there has been a dramatic increase in the number of seismographs deployed in urban areas. These networks are providing critical new information on site response, including effects associated with the near-surface, basin-edge, topography and nonlinear behaviour. It is becoming clear from recent studies (e.g., Japan, Taiwan, Italy, California) that estimating earthquake site response requires more than just Vs30. A number of alternative schemes have recently been proposed, including several that incorporate both the average shear-wave velocity of the upper 10 m (Vs10) of soil and the fundamental period of the soil column based on ambient noise measurements or earthquake recordings. To understand ground shaking, one must incorporate ground shaking recordings with geotechnical and geological data. With new low-cost instruments, and the ease of data transmission and storage, recording ground shaking is now easier and less expensive than ever before. This in turn will allow for detailed seismic microzonation maps that will help to reduce losses (on both soil and rock) during future earthquakes.