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Shear-wave velocity map for Pohang Basin, South Korea, based on the P-wave seismogram method

Junyoung Lee, Kwang-Hee Kim, Su Young Kang, Moon Son and Byungmin Kim
Shear-wave velocity map for Pohang Basin, South Korea, based on the P-wave seismogram method
Earthquake Spectra (August 2022) 38 (3): 2162-2182


The 2017 ML 5.4 Pohang, South Korea earthquake, which caused severe damage, raised attention to the importance of the characterization of the Pohang Basin structure and the identification of active faults. We utilize 366 seismograms recorded at 102 densely deployed seismic stations during 18 microearthquakes with ML ranging from -1.11 to 1.70. We perform the P-wave seismogram method, which has been validated in various regions using seismograms for moderate earthquakes, to estimate the time-averaged shear-wave velocity from the surface to a depth of 30 m (V (sub S30) ) in and around the basin. We perform multichannel analyses of surface waves at the 32 sites to obtain shear-wave velocity (V (sub S) ) profiles, and additionally acquire the 22 existing VS profiles within the study area. We observe that velocity seismograms predict V (sub S30) more accurately than acceleration and displacement seismograms do. The estimated V (sub S30) values are in good agreement with the measured V (sub S30) values. Approximately 93.3% of the measured and estimated V (sub S30) values are located between the + or -100% difference lines. We propose a V (sub S30) map for the vicinity of the Pohang Basin by geospatially interpolating both the measured and estimated V (sub S30) values, which is consistent with the local topography and geology. The proposed map exhibits areas with strong V (sub S30) contrast within the Quaternary and Tertiary sediments, which might be attributed to the existence of faults.

ISSN: 8755-2930
EISSN: 1944-8201
Serial Title: Earthquake Spectra
Serial Volume: 38
Serial Issue: 3
Title: Shear-wave velocity map for Pohang Basin, South Korea, based on the P-wave seismogram method
Affiliation: Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea
Pages: 2162-2182
Published: 202208
Text Language: English
Publisher: Earthquake Engineering Research Institute, Berkeley, CA, United States
References: 41
Accession Number: 2022-049129
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N36°00'00" - N36°12'00", E129°18'00" - E129°30'00"
Secondary Affiliation: Pusan National University, KOR, South Korea
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2022
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