1 Technical Director, GEOVision Geophysical Services, Corona, California. amartin@geovision.com 2 Senior Project Geophysicist, GEOVision Geophysical Services, Corona, California. jb@geovision.com 3 President, GEOVision Geophysical Services, Corona, California. Email: jdiehl@geovision.com COMBINED USE OF ACTIVE AND PASSIVE SURFACE WAVE TECHNIQUES FOR COST EFFECTIVE UBC/IBC SITE CLASSIFICATION Antony J. Martin 1 , Jonathan B. Shawver 2 and John G. Diehl 3 ABSTRACT The average shear wave velocity of the upper 30m (V S 30) and upper 100ft (V S 100) are used in the 2001 Uniform Building Code (UBC) and 2000 International Buiding Code (IBC), respectively, to separate sites into classes for earthquake engineering design. Many state and local building codes are based on

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