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Near-surface seismic methods have been applied in an area south of London, Ontario, in order to image subsurface structure of the overburden and bedrock surface and to obtain estimates of elastic parameters of these sediments. This work was conducted as a pilot study to determine the seismic site response at a future seismograph site for earthquake monitoring. Two seismic refraction-reflection profiles were acquired on two different terraces cut by the Thames River. The results show two major acoustic impedance boundaries, one within overburden related to the presence of a buried overconsolidated till and the other at the overburden-bedrock contact. The elevation of these two contacts is the same for both studied terraces. A 1-D model has been used to obtain estimates of the variation of fundamental site periods in the survey area. The results of this survey provide the basic information needed to evaluate the site response effects. 2001-E7 B. Benjumea et al. 1 CURRENT RESEARCH RECHERCHES EN COURS 2001 Article Article Titles Titres Purchase Information Information pour acheter 1 Department of Earth Sciences University of Western Ontario London, Ontario N6A 5B7

Near-surface seismic methods applied to site-response charcterization at an earthquake monitoring station near London, Ontario