Earthquake-Induced Ground Deformations in the Low-seismicity Region: A case of the 2017 M5.4 Pohang, South Korea, Earthquake
2019
A moment magnitude (M) 5.4 earthquake struck the Pohang city located in the southeastern Korean Peninsula on 15 November 2017, possibly induced by an enhanced geothermal system. Despite the moderate magnitude of the earthquake, extensive geotechnical and structural damages occurred. This study summarizes the widespread geotechnical damages resulted from the Pohang earthquake, observed during our reconnaissance trip. The affected area is mainly covered by Tertiary/Quaternary Alluvium underlain by mudstones with a thickness of approximately 500 m. Due to the soft grounds and shallow focal depth, this area experienced ground settlements up to 39 cm, building settlements that made apartments tilted by 1.6°. We also present observations on ground cracks, lateral spreadings, landslides, retaining wall deformations, and liquefactions. Documenting these damages is significant because 1) those are the first earthquake induced damages observed in Korea, and 2) those are caused by the shallow-depth earthquake possib...
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