MASW-Based Shear Wave Velocities for Predicting Liquefaction-Induced Sand Boils Caused by the 2017 M5.4 Pohang, South Korea Earthquake
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 148, Issue 4
Abstract
An earthquake of moment magnitude 5.4 occurred in Pohang, South Korea on November 15, 2017. This earthquake of moderate magnitude induced failures of structures and buildings and led to ground displacements. Approximately 600 sand boils were observed in the vicinity of the epicenter. We conduct 26 multichannel analysis of surface waves (MASW) tests and obtain three shear wave velocity () profiles from suspension Compression (P) and Shear (S) wave logging at liquefied and nonliquefied sites near the epicenter. The phase velocities at frequencies lower than 10 Hz at the liquefied sites were smaller than those at the nonliquefied sites. The cyclic stress ratios (CSRs), cyclic resistance ratios (CRRs), and factors of safety were calculated. The CRR curves for these approaches predicted sand boils in Pohang with an accuracy of 79.5%. The liquefaction potential index (LPI) was calculated at 29 sites and is geospatially interpolated to create maps near the epicenter. The LPI maps had a maximum accuracy of 77% when LPI thresholds were 8 and 2 for two approaches from the literature. The high accuracies from both local and regional liquefaction evaluations demonstrate the applicability of the existing approaches for moderate earthquakes in South Korea.
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Data Availability Statement
The sand boil inventory data and soil property data used during this study were provided by Gihm et al. (2018) and the National Disaster Management Research Institute, respectively. Direct requests for these data may be made to the providers. The shear wave velocity data used in this study are available from the corresponding author upon request.
Acknowledgments
This research was supported by a grant (20SCIP-C151438-02) from the Construction Technologies Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government, and by a grant (NRF-2020R1C1C1013317) from the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT). We thank Junyoung Lee and Jaesung Kim for helping with the MASW field tests. We also appreciate the two anonymous reviewers who helped enhance the manuscript.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 148 • Issue 4 • April 2022
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© 2022 American Society of Civil Engineers.
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Received: Dec 2, 2020
Accepted: Oct 21, 2021
Published online: Jan 31, 2022
Published in print: Apr 1, 2022
Discussion open until: Jun 30, 2022
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