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http://dx.doi.org/10.5467/JKESS.2010.31.6.541

The Microtremor HVSRs in the SW Korean Peninsula I: Characteristics of the HVSR Peak Frequency and Amplification  

Jung, Hee-Ok (Department of Ocean Construction, Kunsan National University)
Kim, Hyoung-Jun (Department of Earth and Environmental Sciences, Chonbuk National University)
Jo, Bong-Gon (Department of Earth and Environmental Sciences, Chonbuk National University)
Park, Nam-Ryul (Department of Ocean Construction, Kunsan National University)
Publication Information
Journal of the Korean earth science society / v.31, no.6, 2010 , pp. 541-554 More about this Journal
Abstract
Fifteen min-microtremor data sets were collected at 136 sites from a coastal area of Kunsan and 117 sites from an inland area of Jeonju located in SW Korea, and were analyzed for the HVSR (Horizontal to Vertical Spectral Ratio) of the sites. The microtremor spectra of the coastal area have stronger energy in the lower frequency range from 1-6 Hz than those of the coastal area. This result can be attributed to the effect of the waves and tides in the Keum river and the Yellow sea. Twenty four hours of measurement of the microtremor indicated that the microtremor spectrum correlates with the human activities, but the microtremor HVSR peak was observed consistently at the characteristic frequency for the site. The HVSR peaks were grouped into 4 types -"single peak", "double peak", "broad peak" or "no peak"- based on their shapes. More than 90% of the data sets exhibit peak frequencies ($F_0$) which can be easily identified. The distribution of $F_0$ reveals a close relationship with the topography and local geology of the areas, exhibiting high F0s in the hillside areas and low $F_0s$ in the reclaimed land area. While the amplitudes of microtremor HVSR peak frequencies are less than 4 in the downstream of the inland area, those of the recently reclaimed land in the coastal area are extremely high (more than 10). The results of this study indicate that detailed HVSR studies are essential for the earthquake hazard reduction of reclaimed lands.
Keywords
microtremor; HVSR; peak frequency; amplification;
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Times Cited By KSCI : 4  (Citation Analysis)
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