Upper-Crust Shear-Wave Velocity of South Korea Constrained by Explosion and Earthquake Data

Jung, Heeok; Jang, Yong-Seok; Jo, Bong Gon

doi:10.1785/0120110026

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…The central and eastern North America (CENA) region of the United States is a stable continental region with a bedrock shear wave velocity of approximately 3,000 m/s (Hashash et al 2014), and instrumented earthquakes in this region have magnitudes less than 6 (Goulet et al 2014). These seismic environments are similar to those of South Korea (also classified as a stable continental region), where a bedrock shear-wave velocity is approximately 2,600-3,500 m/s (Jung et al 2011) and small-to moderate-magnitude earthquakes occur. Therefore, the findings of this study could help to predict earthquake damage in the regions with similar seismic environments, including the CENA region.…”

Section: Introductionsupporting

confidence: 58%

Earthquake-Induced Ground Deformations in the Low-Seismicity Region: A Case of the 2017 M5.4 Pohang, South Korea, Earthquake

et al. 2019

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A moment magnitude 5.4 earthquake struck the Pohang city located in the southeastern Korean Peninsula on 15 November 2017, possibly triggered by an enhanced geothermal system. Despite the moderate magnitude of the earthquake, extensive geotechnical and structural damage occurred. This study summarizes the widespread geotechnical damage 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. Because of 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 the damage is significant because (1) those are the first earthquake-induced damage observed in Korea, and (2) those are caused by the shallow-depth earthquake possibly induced by an enhanced geothermal system.

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Section: Introductionsupporting

confidence: 58%

Earthquake-Induced Ground Deformations in the Low-Seismicity Region: A Case of the 2017 M5.4 Pohang, South Korea, Earthquake

et al. 2019

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“…Jang and Oh ( 2021) review major faults in the area and their relationship to earthquakes and the 3-D shear-wave velocity model proposed by Jung et al (2011). The authors demonstrate that the distribution of earthquakes at depths of < 12 km trends NE but at > 12 km trends NW.…”

Section: Content Of the Special Issuementioning

confidence: 99%

Editorial: Special issue on “Earthquake swarms in Korea”

Kim

Cho

2021

Geosci J

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“…Characteristics of earthquake ground motions are highly dependent on various factors, including earthquake magnitudes, fault types, soil conditions, and source-to-site distances [20]. Particularly, it is well known that Korea is situated in the seismically stable region [21] and soil and rock conditions are different from other regions [22], resulting in unique earthquake ground motion characteristics in Korea. Hence, it is necessary to ascertain the characteristics of earthquake ground motions in the area under consideration prior to the assessment of a structure's seismic fragility.…”

Section: Earthquake Ground Motionsmentioning

confidence: 99%

Seismic Fragility Analysis of Steel Liquid Storage Tanks Using Earthquake Ground Motions Recorded in Korea

Lee

Kim

Lee

2019

Mathematical Problems in Engineering

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Liquid-containing storage tanks are important structures in industrial complexes. Because earthquake damages to liquid storage tanks can cause structural collapse, fires, and hazardous material leaks, there have been continuous efforts to mitigate earthquake damages using seismic fragility analysis. In this regard, this study focuses on the seismic responses and fragility of liquid storage tanks. First, the characteristics of earthquake ground motions are a critical factor influencing the seismic fragility of structures; thus, this study employs real earthquake records observed in the target area, southeastern Korea, with the earthquake characteristics estimated based on the ratio of peak ground acceleration to peak ground velocity. When a liquid storage tank oscillates during an earthquake, additional forces can impact the tank wall owing to hydrodynamic pressures. Therefore, this study presents a sophisticated finite element (FE) model that reflects the hydrodynamic effect of an oscillating liquid. Another advantage of such an FE model is that detailed structural responses of the entire wall shells can be estimated; this is not possible in simplified lumped mass or surrogate models. Lastly, probabilistic seismic demand models are derived for three critical limit states: elastic buckling, elephant’s foot buckling, and steel yielding. Using the real earthquake ground motion records, constructed FE model, and limit states, a seismic fragility analysis is performed for a typical anchored steel liquid storage tank in Korea. In addition, for comparison purposes, a ring-stiffened model is investigated to derive a seismic fragility curve. The results of the seismic fragility assessment show that elastic buckling is the most vulnerable damage state. In contrast, elephant’s foot buckling and steel yielding indicate relatively severe damage levels. Furthermore, it is observed that ring stiffeners decrease the elastic buckling damage, although there is no practical effect on elephant’s foot buckling and steel yielding in all ground motion intensities.

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Upper-Crust Shear-Wave Velocity of South Korea Constrained by Explosion and Earthquake Data

Cited by 8 publications

References 24 publications

Earthquake-Induced Ground Deformations in the Low-Seismicity Region: A Case of the 2017 M5.4 Pohang, South Korea, Earthquake

Earthquake-Induced Ground Deformations in the Low-Seismicity Region: A Case of the 2017 M5.4 Pohang, South Korea, Earthquake

Editorial: Special issue on “Earthquake swarms in Korea”

Seismic Fragility Analysis of Steel Liquid Storage Tanks Using Earthquake Ground Motions Recorded in Korea

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