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Shallow Shear-wave Velocities Using the Microtremor Survey Method  

Hwang, Yoon-Gu (Department of Geophysics, Kangwon National University)
Kim, Ki-Young (Department of Geophysics, Kangwon National University)
Publication Information
The Journal of Engineering Geology / v.16, no.4, 2006 , pp. 381-392 More about this Journal
Abstract
The passive surface wave survey using microtremor is conducted in areas of crystalline rock basements to obtain average shear-wave velocity structures to 30 m deep (Vs30), on which the earthquake-resistant design standard is based. Test data were recorded at two sites with triangular and L-shaped arrays for 4 seconds with an sampling interval of 2 ms. The microtremor recorded at a site were analysed using the spatial autocorrelation method to obtain phase-velocity spectra and effects of major factors such as size and shape of away and number of record and receiver were examined. At the other site, shear-wave velocities were derived from VSP and microtremor data separately. The results from these two methods agree to each other reasonably well, indicating that the microtremor method can be an effective geophysical tool to measure Vs30.
Keywords
microtremor; surface wave; shear-wave velocity; Vs30; spatial autocorrelation; phase velocity;
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Times Cited By KSCI : 1  (Citation Analysis)
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