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A Study on the Dynamic Amplification Characteristics of the Domestic Seismic Observation Sites using Shear- and Coda-Wave  

Kim, Jun-Kyoung (세명대학교)
Publication Information
Tunnel and Underground Space / v.19, no.5, 2009 , pp. 432-439 More about this Journal
Abstract
For more reliable estimation of seismic source, attenuation properties and dynamic ground property, site amplification function should be considered. Among various estimation methods, this study used the Nakamura's method (1989) for estimating site amplification characteristics. This method was originally applied to the surface waves of background noise and therefore there are some limitations in applying to general wave energy. However, recently this method has been extended and applied to the S wave energy successfully. This study applied the method to S wave and Coda wave energy, which is equivalent to the backscattered S wave energy. We used more than 60 observed ground motions from 5 earthquakes which were occurred recently, with magnitude range from 3.6 to 5.1. Each station showed characteristic site amplification property in low-, high- and resonance frequencies. Some of the stations showed as high as 4 times of site amplification in the range of specific frequencies, which may imply abnormal small scale geologic strata below the station or development of various trapped modes in the basin structure. Moreover, removal of site amplification can give us more reliable seismic source and attenuation parameters, addition to the seismic hazard estimation.
Keywords
Site amplification; H/V spectral ratio; Coda wave; Surface wave; Resonance frequency;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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