HR: 1340h
AN: S23A-0227    [Abstracts]
TI: National Site Classification Map for Australia
AU: * Hall, L S
EM: lisa.hall@rms.com
AF: Risk Management Solutions, 7015 Gateway Blvd, Newark, CA 94560 United States
AU: McPherson, A A
S23A-0227 AF: Geoscience Australia, GPO box 378 , Canberra, ACT 2601 Australia
AB: Historic earthquakes have demonstrated that the properties of geological materials beneath a site have a major influence on the amplitude and frequency content of ground shaking. Consideration of site conditions is therefore an important part of seismic hazard and risk assessment. This study presents a national scale site classification for Australia, for use in regional scale seismic hazard and risk assessment. Site classes are assigned based on the methodology developed by Wills et al. (2000) for California, which uses the relationship between rock type and the shear wave velocity of the upper 30 m (Vs30). The application of this methodology to Australia is tested successfully using bore hole data from a variety of Quaternary sedimentary sequences in the Newcastle, Sydney and Perth urban areas. Adjustments to the classification scheme are suggested to better account for the deep cover of highly weathered Mesozoic (and older) regolith found in the generally stable continental setting.
DE: 1217 Time variable gravity (7223, 7230)
DE: 6699 General or miscellaneous
DE: 7212 Earthquake ground motions and engineering seismology
DE: 7299 General or miscellaneous
DE: 9330 Australia
SC: Seismology [S]
MN: Fall Meeting 2005