Improved HVSR site classification method for free-field strong motion stations validated with Wenchuan aftershock recordings |
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| Authors: | Ruizhi Wen Yefei Ren Dacheng Shi |
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| Institution: | Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China |
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| Abstract: | Local site conditions play an important role in the effective application of strong motion recordings. In the China National
Strong Motion Observation Network System (NSMONS), some of the stations do not provide borehole information, and correspondingly,
do not assign the site classes yet. In this paper, site classification methodologies for free-field strong motion stations
are reviewed and the limitations and uncertainties of the horizontal-to-vertical spectral ratio (HVSR) methods are discussed.
Then, a new method for site classification based on the entropy weight theory is proposed. The proposed method avoids the
head or tail joggle phenomenon by providing the objective and subjective weights. The method was applied to aftershock recordings
from the 2008 Wenchuan earthquake, and 54 free-field NSMONS stations were selected for site classification and the mean HVSRs
were calculated. The results show that the improved HVSR method proposed in this paper has a higher success rate and could
be adopted in NSMONS. |
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| Keywords: | site classification strong motion recording entropy weight theory horizontal-to-vertical spectrum ratio Wenchuan earthquake aftershock head-tail joggle |
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