Terr. Atmos. Ocean. Sci., Vol. 19, No. 6, 671-682, December 2008 |
doi: 10.3319/TAO.2008.19.6.671(PT) |
Chyi-Tyi Lee and Bi-Ru Tsai
Institute of Applied Geology,
Abstract
The average shear-wave velocity of the upper 30 meters of
a soil profile (Vs30) is a key indicator of site response dominating the
ground-motion amplification. The primary purpose of this study is to map the
distribution of Vs30 in Taiwan using available data and multivariate
geostatistical techniques. Data from 230 boring and PS logging at soil and
soft rock strong-motion station sites were used to establish the spatial
relationship between the shear-wave velocity (Vs) and the N value of
standard penetration test (SPT-N). The resultant model was then used to
estimate the shear-wave velocity at each depth of a borehole from the
Geo2005 database of the Central Geological Survey (CGS) of Taiwan. Finally,
a geostatistical method called "kriging with varying local means" was applied
to generate a Vs30 distribution map of Taiwan. The site classification
results can be updated for Taiwan’s strong-motion stations based on this new
Vs30 map and actual site measurements.
Keywords: Vs30, shear-wave velocity, Strong ground-motion, Site characteristics, Ground-motion amplification, Geostatistics.
Citation: Lee, C. T. and B. R. Tsai, 2008: Mapping Vs30 in Taiwan. Terr. Atmos. Ocean. Sci., 19, 671-682, doi: 10.3319/TAO.2008.19.6.671(PT)
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