1887
Volume 50, Issue 4
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

ABSTRACT

With the growing interest in seismic hazards following the Gyeongju earthquake ( 5.8; 2016), information on site amplification characteristics is essential for the effective analysis of seismic hazards in urban areas. To assess amplification characteristics, this study used three reference site methods. Two new modified reference methods were compared with the existing method, which relies on the horizontal/vertical (H/V) ratios of ground motions at the target and reference sites. For each type of seismic energy (S-wave, coda wave and background noise), similarities between the H/V spectral ratios (HVSR) for all three reference site methods were investigated. Site amplification characteristics were analysed using 216 acceleration ground motions of horizontal and vertical components for three earthquakes (Odaesan, Jeju and Gongju), observed simultaneously at four sites and having a magnitude > 3.4. Most electric substations showed similar HVSR behaviour for the three types of seismic energy and three reference site methods over a significant frequency range, with few exemptions. Although site amplification characteristics in the low- and high-frequency ranges, as well as the specific resonance frequency of each electric substation, varied greatly, the site amplification characteristics of the four sites could be classified into two groups: sites with a resonance frequency and those without. First, with the exception of New Taeback (NTB), the sites shared fundamental resonance frequencies in the range between ∼ 5 and ∼ 10 Hz. Second, NTB did not show any significant resonance, which may imply that it is located on a very firm rock formation. Considering all the resonance frequencies, the four sites can be classified as T or harder rocks. By comparing the results with those from other regions, it is possible to provide insight into the site characteristics and the site classification methodology.

© 2019 Australian Society of Exploration Geophysics
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2019-07-04
2026-01-17

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Site amplification characteristics of bedrock using three reference site methods
Exploration Geophysics 50, 420 (2019); https://doi.org/10.1080/08123985.2019.1606203
/content/journals/10.1080/08123985.2019.1606203
/content/journals/10.1080/08123985.2019.1606203
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  • Article Type: Research Article
Keyword(s): background noise; coda wave; H/V spectral ratio (HVSR); reference site; resonant frequency; S-wave; site amplification characteristics

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