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TitleThe importance of ground-truthing for earthquake site response
AuthorCassidy, 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
Alt SeriesEarth Sciences Sector, Contribution Series 20090277
Meeting9th US/10th Canadian Joint Conference on Earthquake Engineering; Toronto, ON; CA; July 25-29, 2010
RelatedThis publication is contained in 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
Subjectsgeophysics; earthquakes; earthquake risk; earthquake studies; earthquake mechanisms; earthquake damage; earthquake resistant design
Illustrationshistograms; plots; graphs
ProgramTargeted Hazard Assessments in Western Canada, Public Safety Geoscience
AbstractOne 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.