Site-dependent shear-wave velocity equations versus depth in California and Japan |
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| Institution: | 1. Tohoku University, 6-6-06, Aramaki Aza Aoba, Aoba-ku, Sendai City, 980-8579 Miyagi, Japan;2. Gifu University, 1-1 Yanagido, Gifu City, 501-1193 Gifu, Japan |
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| Abstract: | Shear-wave velocity of the near-surface ground is an important soil property in earthquake and civil engineering. Using the data from 643 boreholes from the KiK-net in Japan and 135 boreholes from California where the shear-wave velocity profile reaches at least 30 m, firstly, we classify sites by building code, then build site-dependent relationships between travel time and depth by regression utilizing the logarithmic model and power-law model, lastly, we get shear-wave velocity equations versus depth based on the mathematical relationship between travel time and velocity. The results show that: (1) the travel time is strongly correlated with depth, and the Pearson correlation coefficients range between 0.867 and 0.978. (2) there is a certain difference between linear velocity equations and power-law velocity equations, and the power-lower equations are generally more close to measured data than linear equations except for class E in Japan and class D in California. (3) the velocities are similar at the sites of each class for different regions but that the gradient of velocity with depth vary between different regions. |
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| Keywords: | Shear-wave velocity Travel time Site class |
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