Localization and characterization of the southern Ulsan fault (UF) using geo-electrical imaging: Implication for seismic hazard assessment in an urbanized area

Naik, Sambit Prasanajit; Gwon, Ohsang; Park, Kiwoong; Bae, Sang Yeol; Hyeoncho, Shin; Choi, Jungsoon; Kim, Young‐Seog

doi:10.1016/j.jog.2022.101919

Cited by 9 publications

(7 citation statements)

References 62 publications

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“…ERT is well established and is one of the most frequently used non-destructive shallow subsurface investigation methods in various research fields (e.g., [68]). It has been successfully used in numerous structural geology studies to determine various lithology and discontinuities associated with (active) faults [12,14,[69][70][71][72][73][74][75][76][77][78]. Its use is recommended to determine a suitable paleoseismological trench location and its depth, with an electrode spacing of 5 m generally suitable to reveal the broader resistivity distribution, while shorter (≤1 m) electrode spacing should be used to determine a more accurate trench location [79].…”

Section: Electrical Resistivity Tomography (Ert)mentioning

confidence: 99%

“…Sampling We excavated a 2 × 2 × 2 m pit into the Povlje fan to date the activity of the Sava Fault. We took two bulk clay samples from depths of 1 m (UK19-5) and 1.45 m (UK19-6), respectively, for 14 C dating. We collected one luminescence sample (UK19-7) from a depth of 1.05 m below surface.…”

Section: Ground-penetrating Radar (Gpr)mentioning

confidence: 99%

“…3.6.2. 14 C Dating Bulk 14 C dating has been used to determine the age of organic material in sediment samples. This method is often used in situations where the organic material is not well preserved, when no charcoal or similar organic fragments are available, or when the sample consists of a mixture of different organic components [99][100][101].…”

Section: Ground-penetrating Radar (Gpr)mentioning

confidence: 99%

“…Another possible source of young carbon in the sediment could be bioturbation. Due to these reasons, we consider the 14 C dating results to not reflect the age of the Povlje fan. Depositional ages can be derived from luminescence dating, which measures when the sample has last been exposed to sunlight.…”

Section: Dating the Povlje Fanmentioning

confidence: 99%

“…Using highresolution DEMs in such an environment can help to recognize small-scaled geomorphic indicators for fault activity, enabling us to infer fault slip rates (e.g., [3][4][5][6][7]) and locate paleoseismic trenches to study past seismicity (e.g., [8][9][10][11]). In addition to investigating surface deformation, shallow subsurface investigations, including geophysical techniques with a range of tens of meters, can confirm the presence of young tectonic deformation along faults, help to precisely constrain their location, and understand the shallow geometry of the deformation structure [8,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Revealing Subtle Active Tectonic Deformation: Integrating Lidar, Photogrammetry, Field Mapping, and Geophysical Surveys to Assess the Late Quaternary Activity of the Sava Fault (Southern Alps, Slovenia)

Jamšek Rupnik,

Atanackov,

Horn

et al. 2024

Remote Sensing

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We applied an interdisciplinary approach to analyze the late Quaternary activity of the Sava Fault in the Slovenian Southern Alps. The Sava Fault is an active strike-slip fault, and part of the Periadriatic Fault System that accommodated the convergence of Adria and Europe. It is one of the longest faults in the Southern Alps. Using high-resolution digital elevation models from lidar and photogrammetric surveys, we were able to overcome the challenges of assessing fault activity in a region with intense surface processes, dense vegetation, and relatively low fault slip rates. By integrating remote sensing analysis, geomorphological mapping, structural geological investigations, and near-surface geophysics (electrical resistivity tomography and ground penetrating radar), we were able to find subtle geomorphological indicators, detect near-surface deformation, and show distributed surface deformation and a complex fault pattern. Using optically stimulated luminescence dating, we tentatively estimated a slip rate of 1.8 ± 0.4 mm/a for the last 27 ka, which exceeds previous estimates and suggests temporal variability in fault behavior. Our study highlights the importance of modern high-resolution remote sensing techniques and interdisciplinary approaches in detecting tectonic deformation in relatively low-strain rate environments with intense surface processes. We show that slip rates can vary significantly depending on the studied time window. This is a critical piece of information since slip rates are a key input parameter for seismic hazard studies.

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