Seongjun Lee

• PostDoc Position at Korea Institute of Geoscience and Mineral Resources

Earthquake prediction in intraplate regions, such as the Korean Peninsula, is challenging due to the complexity of fault distributions. This study employed diverse methods and data sources to investigate Quaternary surface rupturing along the Yangsan Fault, aiming to understand its long-term earthquake behavior. Paleoseismic data from the Byeokgye...

Earthquake prediction in intraplate regions, such as South Korea, is challenging due to the complexity of fault zones. This study employed diverse methods and data sources to detect Quaternary surface rupturing along the Yangsan Fault to improve seismic hazard assessment. Paleoseismic data were analyzed to reveal insights into seismic activity, dis...

The 2017 Pohang earthquake (ML 5.4) ranks as the second-largest instrumental earthquake in the Korean Peninsula and the country’s most destructive seismic event. The earthquake history of the Pohang area prior to the 2017 event is unknown due to the absence of instrumental seismic activity and the lack of mapped Quaternary faults near the 2017 epic...

We analyzed the structural characteristics of faults that cut unconsolidated conglomerates on three construction slopes in Geumsan-ri, Yangsan-si. This outcrop is located approximately 0.6 km north of the Gasan site, where Quaternary faulting has been previously reported. The six faults observed in Geumsan-ri have N14o-32oE strikes; the dip of thre...

We present a new example of the termination of strike-slip paleoearthquake ruptures in near-surface regions on the Yangsan Fault, Korea, based on multi-scale structural observations. Paleoearthquake ruptures occur mostly along the boundary between the inherited fault core and damage zone (N10-20°E/> 75°SE). The ruptures propagated upward to the sha...

We discuss the geometry and evolution of the age-unknown Pyeonghae Basin, which is located at the boundary of the Gyeongsang Basin and Yeongnam Massif, based on the detailed geological mapping, characteristics of the basin fills, and analysis of stratal attitudes and geological structures in and around the basin. The Pyeonghae Basin has the shape o...

This study aims to identify the fault zone architecture and geometric and kinematic characteristics of the Yeongdeok Fault, based on the geometry and kinematic data of various structural elements obtained by detailed field survey and anisotropy of magnetic susceptibility (AMS) of the fault rocks. The Yeongdeok Fault extends from Opo-ri, Ganggu-myeo...

In this study, we conducted a geomorphologic analysis, fieldwork, geophysical survey, and trench survey to trace the Quaternary faulting along the northern Yangsan fault. We also complement the study with the Electron Spin Resonance and luminescence datings of the fault rocks and Quaternary sediments, respectively, to constrain the timing of the Qu...

Earthquakes cause various seismic hazards such as ground motion, liquefaction, landslides, and surface rupture. We focused on potential seismic landslide hazard assessment in Busan Metropolitan City, Korea. The study area is the largest city close to the epicenter of a recent series of mid-scale earthquakes (Gyeongju and Pohang earthquakes). Three...

In this study, we conduct structural characterization and Anisotropy of Magnetic Susceptibility (AMS) analysis of the Quaternary fault, and the OSL/IRSL age dating for the Quaternary sediments to identify the characteristics and timing of the Quaternary faulting events for which the fault is found through trench survey at Dangu-ri, Gyeongju-si, SE...

The Gyeongsang Basin, the largest Cretaceous nonmarine sedimentary basin in Korea, formed as a continental back-arc basin related to NNW-directed subduction of the (proto-) Pacific Plate underneath the Eurasia Plate. The basin can be divided into an earlier-formed western back-arc depression and a later-formed eastern volcanic arc platform. We inve...

This study aims to identify the geometry and internal structures of the Yeongdeok Fault, a branch fault of the Yangsan Fault, by detailed mapping and to characterize its kinematics by analyzing the attitudes of sedimentary rocks adjacent to the fault, slip data on the fault surfaces, and anisotropy of magnetic susceptibility (AMS) of the fault goug...

This study focuses on the internal structures and multi-stage deformation history of the Yangsan Fault Zone based on the newly exposed outcrops in Gyeongju-Eonyang area during the widening construction of Seoul-Busan highway. The fault zone is divided into fault core/mixed and damage zones of several tens of meters and of a few hundred meters in wi...

The inventory and quantitative assessment of geological heritages have become a major issue in the establishment of geopark. The purpose of this study is to adjust the preliminarily adopted assessment model for comprehensive and objective assessment and to suggest improved grade standard. The model is divided into two parts, each with several sub-c...