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Introduction
My current research interests include earthquake faulting and fault zone evolution processes as well as paleoseismology and active tectonics on the Korean peninsula.
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Publications
Publications (47)
Integration of geological and geophysical data is essential to elucidate the configuration and geometry of surface and subsurface structures, as well as their long-term evolution. The NNW–SSE-striking incised valley and parallel mountain range in the southeastern margin of the Korean Peninsula, extending 50 km from Gyeongju to Ulsan cities, are tog...
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...
The Yangsan Fault, a long-lived intracontinental fault in SE Korea, exhibits various slip behaviors, including coseismic slip and aseismic creep. However, there is insufficient knowledge of deformation microstructures to reveal the deformation mechanisms operating within the fault. In this study, we present an analysis of the mechanical behaviors d...
Tectonics is broadly accepted as one of the main factors controlling long-term landscape evolution. The impact of tectonics on short timescales is most often observed through earthquake rupturings that produce localized, metric-scale deformations. Although these deformations significantly affect the landscape, it remains challenging to precisely co...
The main goal of active fault investigation is obtaining evidence of the Quaternary fault activity through trenching. To accomplish this, electrical resistivity surveys are widely utilized to accurately detect faults buried beneath alluvium. In this study, 2D and 3D electrical resistivity surveys were conducted at the Miho site of the southern Yang...
Transpression occurs in response to oblique convergence across a deformation zone in intraplate regions and plate boundaries. The Korean Peninsula is located at an intraplate region of the eastern Eurasian Plate and has been deformed under the ENE–WSW maximum horizontal compression since the late Pliocene. In this study, we analyzed short-term inst...
We studied the Quaternary incised fills drilled at the northern Yangsan Fault having multiple deformation histories since Late Cretaceous or Paleogene to determine tectonic influence on development of incised valley and its sedimentation. Incised valley fills were deposited during and after the Last Glacial Maximum and are composed of fluvial lag,...
Some parts of the Yangsan Fault, a prominent mature intraplate fault on the Korean Peninsula, are still active. However, structural and paleoseismic investigations are limited because a large portion of the fault zone is covered by Quaternary sediments. To characterize the northern Yangsan Fault (NYF) and its paleoseismic features, we conducted top...
An intraplate tectonic fault evolves with repeated seismic cycles that may exhibit multi‐mode slip behaviors (continuous aseismic sliding, slow slip with silent earthquakes, and earthquakes resulting from stick‐slip frictional instability). Here, we show long‐term (geological time scale) fault zone weakening processes and short‐term (seismic cycle...
Earthquake fault slip accompanied by surface ruptures may occur not only along main fault cores but also along subsidiary faults in damage zones of major (or mature) faults. Nevertheless, most previous studies of fault and earthquake geology have focused on geological observations of main core zones rather than subsidiary faults. We conducted micro...
We re-evaluate the stress state across the Korean Peninsula by analyzing the stress tensor inversion results, strike–rake relationships, and faulting-type indicator–magnitude relationships of published earthquake focal mechanism data. Previous studies have shown that the stress state is characterized by a strike-slip faulting stress regime with ENE...
The NNE-SSW-striking Yangsan Fault, which can be traced through Busan, Yangsan, Gyeongju, Pohang, and Yeongdeok, is a mature fault with a multi-stage deformation history that has been active since at least the Late Cretaceous. The fault is also associated with Quaternary deformation features at the surface. In the last several decades, academic and...
The Cheorwon area of South Korea has several records of the Quaternary faulting along the Chugaryung fault system and volcanic activity (Hantangang River Basalt). The most recent faulting event occurred along a segment of the Wangsukcheon fault (ca. 210 ka). In this study, a 5-m-deep trench was examined at the northern end of the Cheorwon Plain. Th...
The NNE–SSW-striking Yangsan Fault in southeastern Korea has been regarded as one of the most prominent seismogenic structures in the Korean Peninsula on the basis of instrumental and historical seismicity, and paleoseismic records along the fault zone. Its seismic behavior is, however, still uncertain due to long recurrence intervals of strong ear...
In 1905, two M~8 continental strike-slip earthquakes occurred along the Bulnay fault system, in the northwestern part of Mongolia. After a first earthquake that ruptured the Tsetserleg oblique fault strand, the second event ruptured the main Bulnay fault 14 days later. With a total rupture of 676 km, these two earthquakes constitute the largest con...
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...
The main fault zone of the Yangsan Fault, located in the southeastern part of the Korean peninsula, is newly found at the Cheonjin-ri, Dudong-myeon, Ulju-gun, Ulsan, Korea. About 100 wide fault zone exposed along the Guryangcheon stream strikes N-S and dips over 70° toward east. The main fault zone is composed of N-S-striking gouge and breccia laye...
Intraplate faulting and the resultant earthquakes are not well understood because of their complex distribution, long period of seismic recurrence, and poor exposure of surface rupture. Pre-existing weaknesses should be studied to understand intraplate faulting and earthquakes. We are developing a long-term project to understand Korean-type intrapl...
This study describes a large recumbent fold, which occurs at the north entrance slope of the Batjae tunnel, Pyeongchang-gun, Gangwon-do, and interprets its formation mechanism. The several-hundred-meter scale fold, developed in the Jeongseon Limestone of the Paleozoic Joseon Supergroup, has a nearly horizontal axial plane and its head is facing nor...
The WNW-ESE-striking Sinnyeong Fault, the most conspicuous fault of the Gaeum Fault System in the Cretaceous Gyeongsang Basin of Korea, provides an opportunity to understand the architectures and evolution of an intracontinental transpressional fault zone. We focus on the structural characteristics of the Sinnyeong Fault based on detailed field obs...
We describe the structural characteristics and tectonic evolution of the NNE–SSW-striking Yangsan Fault, Korea.
The surface trace of the fault extends for over 170 km on land, displaying ∼20–30 km of dextral offset. It
transects mainly Mesozoic–Cenozoic sedimentary and igneous rocks. Our field observations suggest that the style
of deformation with...
This study focuses on the investigation of geologic distribution and stratigraphy in the eastern part of Yeongdeok-gun, based on Lidar imaging, detailed field survey, microscopic observations, SHRIMP and LA-MC-ICPMS U-Pb age dating, and a new geological map has been created. The stratigraphy of the study area is composed of the Paleoproterozoic met...
The Goseong Formation, the lowermost formation of the Yucheon Group, disconformably overlies the Jindong Formation, which is the uppermost formation of the Hayang Group, and is overlain and intruded by the andesitic rocks of the Yucheon Group and the Bulguksa Granites. We revealed the distribution and structural
evolution of the formation based on...
The Quaternary Seooe fault outcrop observed in cut slope of road construction, Seooe-ri, Goseong-gun, Gyeongsangnam-do, is the first discovered Quaternary fault in the southern coastal area of Gyeongnam. This study presents its structural features, such as geometry and kinematics, and discusses the movement timing and associated earthquake magnitud...
The Quaternary Seooe fault outcrop observed in cut slope of road construction, Seooe-ri, Goseong-gun, Gyeongsangnam-do, is the first discovered Quaternary fault in the southern coastal area of Gyeongnam. This study presents its structural features, such as geometry and kinematics, and discusses the movement timing and associated earthquake magnitud...
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...
Pseudotachylytes, i.e., solidified friction-induced melts, are strong evidence of seismic slip on faults. Here we report pseudotachylyte (PT)-bearing faults studied in outcrops of granodiorite (SHRIMP U-Pb zircon age, 75.0±1.5 Ma) and biotite granite (SHRIMP U-Pb zircon age, 58.4±1.1 Ma) on the coast of Bonggil-ri, Yangbuk-myeon, Gyeongju, SE Korea...
The Dadaepo Basin is a small late Cretaceous sedimentary basin in SE Korea, located on the
eastern margin of Asia. The basin is an isolated extensional basin situated between the NNE-striking
Yangsan and Dongnae faults. The basin-fill sediments, named the Dadaepo Formation, consist of
channelized conglomerates and sandstones intercalated with domin...
Crustal deformation of SE Korea caused by back-arc opening of the East Sea (Sea of Japan) commenced locally in the Late Oligocene. Intense deformation occurred during the Early Miocene, accompanying extension of parallelogram-shaped pull-apart basins between NNW-striking principal displacement zones, clockwise rotation and northwestward tilting of...
The social demands to conserve the geological outcrops with important scientific values are
increasing. Accordingly public programs such as national geopark are recently established. In this study,
outcrops with geological values in the Dusong Peninsula geosite of the Busan National Geopark are
investigated in details with a discussion in the aspec...
This study focuses on the geometry and kinematics of the Sinnyeong Fault which is the most conspicuous fault among the WNW-trending Gaeum Fault System in the Gyeongsang Basin, SE Korea. The fault is traced for over ca. 70 km and has a consistent WNW-trending strike with a nearly vertical dip. It has an asymmetric fault damage zone of several meters...
The Ipcheon Subbasin is an isolated Miocene basin in SE Korea, which has the geometry of an asymmetric graben elongated in the NE-SW direction. It is in contact with basement rocks by faults and separated from adjacent Waup and Eoil basins by the basement. The strata of the basin fills have an overall homoclinal structure, dipping toward NW or WNW....
Detailed geological mapping and observations of various structural elements were made in order to determine the geometry and kinematics of the Ocheon Fault System (OFS) along the boundary between the Early Miocene Janggi and the Middle Miocene Pohang basins, SE Korea, and to reveal its roles on the basin evolutions. The OFS is a NE-trending relayed...
