BROWSE

Related Researcher

Author's Photo

Kim, Byungmin
Geotechnical Earthquake Engineering Research Group
Research Interests
  • Seismic Site Response Analysis, Seismic Hazard Analysis, Slope Stability Analysis, Geospatial Analysis, Soil-Structure Interaction Analysis

ITEM VIEW & DOWNLOAD

Assessment of seismic vulnerability using the horizontal-to-vertical spectral ratio (HVSR) method in Haenam, Korea

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Assessment of seismic vulnerability using the horizontal-to-vertical spectral ratio (HVSR) method in Haenam, Korea
Author
Kang, Su YoungKim, Kwang-HeeKim, Byungmin
Issue Date
2021-02
Publisher
GEOLOGICAL SOCIETY KOREA
Citation
GEOSCIENCES JOURNAL, v.25, pp.71 - 81
Abstract
The town of Haenam in southwest Korea lies partially on reclaimed coastal land and experienced an unprecedented earthquake swarm during April and May 2020. Construction of a new town in the area means that there is demand to evaluate the seismic hazard caused by site-specific amplification of seismic ground motions by artificial unconsolidated cover. We used a microtremor horizontal-to-vertical spectral ratio (HVSR) method to identify resonance frequencies, image depths to bedrock, and assess seismic ground vulnerability across the epicentral area of the recent earthquake swarm. Microtremor measurements were taken at 144 sites across an 18.5 km x 12.5 km study area. The HVSR analysis shows resonance frequencies as low as 1.1 Hz. Using mean shear-wave velocities obtained by Multi-Channel Analyses of Surface Waves (MASW), we find that resonance frequencies correspond to depths to bedrock of between 3 m and 56 m. There are clear relationships between the distribution of resonance frequencies, depths to bedrock, surface geology, and areas of development in recent land reclamation projects. Higher resonance frequencies characterize areas of thin sedimentary cover or hard rock sites, while relatively low resonance frequencies characterize reclaimed land or greater depths to bedrock. We quantify the seismic hazard potential across the study area using the seismic vulnerability of ground index (K-g), and observe a clear association between zones of high K-g and areas of reclaimed land. This study demonstrates the value of the HVSR technique in characterizing the subsurface and assessing seismic vulnerability in areas of reclaimed land, where it can be used as a viable and low-cost alternative to large-scale active seismic refraction or MASW measurements. The results can also be used to inform and guide urban planning projects.
URI
https://scholarworks.unist.ac.kr/handle/201301/48180
URL
https://link.springer.com/article/10.1007%2Fs12303-020-0040-9
DOI
10.1007/s12303-020-0040-9
ISSN
1226-4806
Appears in Collections:
UEE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU