Chan Hong Park

Korea Institute of Ocean Science and Technology

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Chang Hwan Kim

Hyundai Motors (South Korea)

Soon Young Choi

Korea Institute of Ocean Science and Technology

Ki Young Kim

Kangwon National University

R. M. René

Indiana Geological and Water Survey

Jong-Uk Kim

Korea Institute of Ocean Science and Technology

Yun-Bae Kim

Chungbuk National University

Won Hyuck Kim

Korea Institute of Ocean Science and Technology

Minji Lee

National Fisheries Research and Development Institute

Jihye Oh

Korea Institute of Ocean Science and Technology

Jong Sun Hwang

Korea Electric Power Corporation (South Korea)

Cooperative Institutions

Korea Institute of Ocean Science and Technology

Seoul National University

Yonsei University

Korea University of Science and Technology

Kyungpook National University

Hanyang University

Korea Maritime and Ocean University

Yonsei University Health System

Korea University

Chungnam National University

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Electron microscopy study on the formation of ferromanganese crusts, western Pacific Magellan Seamounts

Marine Geology (2019)

Kiho Yang Hanbeom Park Seung-Kyu Son Hionsuck Baik Kyeongryang Park

Ferromanganese

Seamount

Pyrolusite

10.1016/j.margeo.2019.01.001

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Citations (17)

Location of Magnetic Dipoles in Chongcho Lake, Republic of Korea: An Application of the SOAPFI (Shape‐of‐Anomaly Potential Field Inversion) Program

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2000 (2002)

Chan Hong Park R. M. René Ki Young Kim

PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2002Location of Magnetic Dipoles in Chongcho Lake, Republic of Korea: An Application of the SOAPFI (Shape‐of‐Anomaly Potential Field Inversion) ProgramAuthors: Chan Hong ParkR. M. RenéKi Young KimChan Hong ParkKorea Ocean Research & Development Institute, Seoul, Korea, R. M. RenéIndiana Geological Survey, Indiana University., Bloomington, IN, and Ki Young KimDept. of Geophysics, Kangwon National University, Chunchon, Koreahttps://doi.org/10.4133/1.2927058 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Introductory paragraph for this paper is available only in the PDF and GZipped PS filesPermalink: https://doi.org/10.4133/1.2927058FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2002ISSN (online):1554-8015Copyright: 2002 Pages: publication data© 2002 Copyright © 2002 The Environmental and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 30 Sep 2008 CITATION INFORMATION Chan Hong Park, R. M. René, and Ki Young Kim, (2002), "Location of Magnetic Dipoles in Chongcho Lake, Republic of Korea: An Application of the SOAPFI (Shape‐of‐Anomaly Potential Field Inversion) Program," Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 12UXO2-12UXO2. https://doi.org/10.4133/1.2927058 Plain-Language Summary PDF DownloadLoading ...

Anomaly (physics)

10.4133/1.2927058

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A Study on Detailed Bathymetry and Geophysical Characteristics of the Summit of the Dokdo Volcano

Economic and Environmental Geology (2012)

Chang Hwan Kim Chan Hong Park Myoung Hoon Lee Soon Young Choi Hyeong T. Jou

본 연구는 현재까지 수행된 독도 화산체 정상부 해역의 정밀수심 및 지구물리 조사 자료를 종합하고 분석하여 정상부 해역의 정밀해저지형 및 지구물리학적 특성을 연구하였다. 독도 연안역 동도와 서도 사이 연결 수로는 약 10 m 이내의 얕은 수심을 이루고 있다. 독도 화산체 정상부해역의 전체적인 수심은 동도와 서도의 육지부부터 수면 아래 약 30 m 까지는 불규칙하며 급한 경사면을 가지고, 그 후 수심 약 30 m부터 수심 약 80 m 까지는 경사가 점차 낮아지다가 수심 약 80 m 이하로 완만한 경사를 보이면서 외해역으로 깊어진다. 독도 육지부와 그 북동쪽 및 북서쪽으로 연장되는 암반들은 독도를 생성시킨 화구륜의 잔해로 판단되며 동도와 서도는 화구륜의 남쪽 한부분일 가능성이 큰 것으로 생각된다. 또한 정상부 해역의 해저지형에서는 소규모의 움푹 패인 지형들이 나타나는데 이는 독도 형성 후 나중에 생성된 소규모 분화구의 흔적들로 추정된다. 독도 정상부 해역은 주로 암반이 많이 분포하지만 곳곳에서는 모래 퇴적층들도 나타나는 것을 볼 수 있다. 독도 화산체 정상부에는 계단형의 경사면들이 나타나는데 이는 제4 기에 나타난 해침, 해퇴 등 해수면변화에 의해 만들어진 해저단구로 유추되며, 지역별로 차이가 있기는 하지만 주로 약 30 m, 60 m, 80 m 및 약 100 m의 수심대를 위주로 하여 몇 개의 주요 해저단구가 나타나는 것으로 판단된다. 자기이상도 및 아날니틱신호도를 살펴보면 수면 위 독도에서 연장되는 북동 및 북서쪽의 이상대들은 화구륜의 잔해로 예상되는 암반들의 위치와 유사하게 나타난다. We studied the detailed bathymetry and the geophysical characteristics of the summit of the Dokdo volcano using mutibeam echosounding and geophysical survey data. The bathymetry around the main east and west islets of the Dokdo volcano shows very shallow within about 10 m water depth. From near islets to about 30 m b.s.l., the shallow water area has very steep slope and many irregular sunken rocks. The area from about 30 m to about 80 m b.s.l. shows gentle rises and falls, and less steep slope. The area from 80 m b.s.l. has gradually flat undulation and smooth slope seabaed and is extended to offshore. The main islets of the Dokdo volcano and the rocky sea bottom elongated from the islets might be the residual part of the eroded and collapsed main crater of the Dokdo volcano. The bathymetry and the seafloor image(from backscattering) data show small craters, assumed to be formed by the eruption of later volcanism. The seafloor images propose that, except some areas with shallow sand sedimentary deposits, there are typical rocky bottom such as rocky protrusions and lack of sediments in the main morphology of the survey area. The stepped slopes of the seabed are deduced to be submarine terraces. The several prominent submarine terraces are found at the summit of the Dokdo volcano, suggesting repetition of sea level changes(transgressions and regressions) in the Quaternary. The results of the magnetic anomaly and the analytic signal have a good coherence with other geophysical consequences regarding to the location of the residual crater.

Seafloor Spreading

Submarine volcano

10.9719/eeg.2012.45.6.685

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Citations (4)

A Study on the Magnetic and Submarine Geology Structure of TA22 Seamount in Lau Basin, Tonga

World Academy of Science, Engineering and Technology, International Journal of Geological and Environmental Engineering (2017)

Soon Young Choi Chan Hwan Kim Chan Hong Park Hyung Rae Kim Myoung Hoon Lee

Seamount

Submarine volcano

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Seasonal phytoplankton dynamics in oligotriphic offshore water of Dokdo, 2018

Environmental Biology Research (2019)

Minji Lee Yun-Bae Kim Jung Hoon Kang Chan Hong Park Seung Ho Baek

10.11626/kjeb.2019.37.1.019

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Citations (3)

Seasonal distribution of phytoplankton and environmental factors in the offshore waters of Dokdo: Comparison between 2018 and 2019

Environmental Biology Research (2020)

Minji Lee Yun-Bae Kim Jung Hoon Kang Chan Hong Park Seung Ho Baek

10.11626/kjeb.2020.38.1.047

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Gravity and magnetic anomalies of earthquake-prone areas in the southwestern Ulleung Basin margin, East Sea (Sea of Japan)

Research Square (Research Square) (2022)

Chang Hwan Kim Kwang Hee Kim Soon Young Choi Won Hyuck Kim Hyun Ok Choi

Abstract Submarine earthquakes have increased in the southwestern Ulleung Basin adjacent to the Korean Peninsula. This study analyzed the gravitational and magnetic properties of the three earthquake-prone areas (Hupo Bank and offshore regions near Pohang and Ulsan) in the basin. The basin was affected by tensile and compressive stresses during the formation of the East Sea. The southern Hupo Bank and the Pohang offshore exhibited high gravity anomalies and strong magnetic anomalies. Hupo Bank was separated from the peninsula and earthquakes in this region have been influenced by crustal fractures that facilitated igneous activities during the formation of the basin. Dense volcanic rocks and seaward dipping reflectors along the Pohang coast and continental slope suggest magmatic activities during the formation of the East Sea. Comparatively, the Ulsan offshore, with a thick sedimentary layer, exhibited a slightly higher gravity anomaly than the surrounding area, but no significant differences in the magnetic anomaly. Sequential tensile and compressive stresses related to the creation of the basin produced complex tectonic structures in this region. The magnetic tilt derivative results suggest that earthquakes were located near magnetic source boundaries. The results show that it is important to monitor earthquake-prone areas with gravity and magnetic anomalies.

Peninsula

10.21203/rs.3.rs-1794870/v1

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Intra‐Inversion Filtering for Least‐Squares Inversion of Magnetic Dipole Fields in the Presence of Residual Non‐DC Background Magnetic Fields and Overlapping Dipole Fields

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2000 (2004)

R. M. René Chan Hong Park Ki Young Kim

PreviousNext No AccessSymposium on the Application of Geophysics to Engineering and Environmental Problems 2004Intra‐Inversion Filtering for Least‐Squares Inversion of Magnetic Dipole Fields in the Presence of Residual Non‐DC Background Magnetic Fields and Overlapping Dipole FieldsAuthors: R. M. RenéChan Hong ParkKi Young KimR. M. RenéIndiana Geological Survey, Indiana University, Bloomington, IN, Chan Hong ParkKorea Ocean Research and Development Institute, Seoul, Korea, and Ki Young KimKangwon National University, Chunchon, Koreahttps://doi.org/10.4133/1.2923278 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Introductory paragraph for this paper is available only in the PDF and GZipped PS filesPermalink: https://doi.org/10.4133/1.2923278FiguresReferencesRelatedDetails Symposium on the Application of Geophysics to Engineering and Environmental Problems 2004ISSN (online):1554-8015Copyright: 2004 Pages: 1823 publication data© 2004 Copyright © 2004 The Environmental and Engineering Geophysical SocietyPublisher:Environmental & Engineering Geophysical Society HistoryPublished: 30 Sep 2008 CITATION INFORMATION R. M. René, Chan Hong Park, and Ki Young Kim, (2004), "Intra‐Inversion Filtering for Least‐Squares Inversion of Magnetic Dipole Fields in the Presence of Residual Non‐DC Background Magnetic Fields and Overlapping Dipole Fields," Symposium on the Application of Geophysics to Engineering and Environmental Problems Proceedings : 1315-1331. https://doi.org/10.4133/1.2923278 Plain-Language Summary PDF DownloadLoading ...

10.4133/1.2923278

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Submerged aeolian dunes on the flat-topped Dokdo seamount in the East (Japan) Sea, Korea

Jang J. Bahk Soo-Jin Kim Chang Hwan Kim Young Kwan Sohn Chan Hong Park

This study examines subaqueous dunes located on the southern periphery of the flat top of Dokdo Seamount at water depths from 120 to 170 meters, where the present ocean currents are incapable of generating such large bedforms. To determine their origin, we conducted a comprehensive analysis of the geomorphic characteristics using high-resolution multi-beam bathymetry and the grain-size characteristics of seafloor sediments. The analysis of the dune spacing in relation to height, as well as their migration and growth pattern, indicates that the Dokdo subaqueous dunes (DSDs) originally formed as aeolian dunes. These were shaped by northerly winter winds that carried sands from the wave erosion surfaces on the northern part of the flat top. The DSDs are believed to have transitioned to their current submerged state without experiencing significant erosion or reactivation. Considering the variations in the Plio-Pleistocene global mean sea level, we estimate the possible subsidence rate of the flat top to be approximately 130 m/myrs, aligning with the conditions required for the formation of DSDs. This study highlights how relict features such as submerged aeolian dunes on seamount summits can be utilized to precisely estimate the subsidence rate of oceanic volcanoes.

Seamount

10.5194/egusphere-egu24-7144

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Detailed Bathymetry and Seabed Characteristics of Wangdol-cho, Hupo Bank in the East Sea

Economic and Environmental Geology (2014)

Chang Hwan Kim Chan Hong Park

동해의 주요 어장이고 레저 관광과 동해 해양환경 연구 등에서 매우 중요한 역할을 하고 있는 후포퇴 왕돌초 주변해역에 대한 정밀해저지형을 분석하고, 해저면 영상 자료 및 퇴적물 입도 결과를 이용하여 해저면 특성을 분류하였다. 후포퇴는 동해의 해안선과 평행하게 나타나며 가장 수심이 얕은 지역은 후포항 동쪽에 위치하고 있는 왕돌초 지역이다. 이 왕돌초는 셋잠(북쪽), 중간잠(중간), 맞잠(남쪽)이라는 3개의 봉우리로 구성되어 있다. 세 개의 봉우리 중 가장 수심이 낮은 지역은 중간잠으로 약 6 m의 가장 얕은 수심을 보이고, 북쪽의 셋잠은 약 8 m, 남쪽의 맞잠은 약 9 m의 수심에서 가장 얕은 지역이 나타난다. 왕돌초의 세 봉우리 주변으로는 얕은 해저지형을 보이며 복잡한 지형 기복과 많은 암반들이 산재한다. 그 암반들 사이 및 북동쪽의 평탄면과 급경사면의 서쪽 주변부로는 모래질자갈/자갈질모래 등의 비교적 굵은 조립질 퇴적물이 관측된다. 왕돌초 서쪽으로는 불규칙한 지형보다는 지형 기복이 감소하고 급격한 경사면이 존재하며 후포분지와 연결되는데 이 후포분지 지역은 니질/실트질 모래류의 퇴적물이 나타난다. 왕돌초 주변의 정밀해저지형과 해저면 특성 분석자료는 향후 왕돌초 해역의 해양환경연구 및 생태계의 지속적 이용을 위한 관리에 기여할 것으로 판단된다. The Wangdol-cho area, in the Hupo Bank, plays a very important role in main fishing grounds, leisure tourism and marine environmental researches of the East Sea. We analyzed the detailed bathymetry and classified the seabed characteristics of the Wangdol-cho area, based on seafloor backscattering images and sediment grain size. The Hupo Bank is developed in parallel with the eastern coastal line of Korean peninsula, and the shallowest area (Wangdol-cho) of the Hupo Bank is located along the eastern part of Hupo Port. The Wangdol-cho comprises three summits; north summit, middle summit, and south summit. The middle summit area among the three summits has the most shallow water depth with minimum about 6 m. The north summit shows about 8 m minimum depth and the south summit about 9 m. The bathymetry data around three summits represent undulating seabeds with many scattered underwater reefs and shallow water depth. The area between the underwater reefs, the flat seafloor in the northeastern part of the survey site, and the western steep slope area have relatively coarse sediments such as sandy gravel and gravelly sand. The bathymetry in the western side of the Wangdol-cho shows steep slope seabed, extending to the Hupo Basin. Fine sediments including mud and silty sand occur in the Hupo Basin area of the survey site. The submarine detailed topography and the analysis of the seafloor characteristics of the survey area are expected to contribute to management for marine environmental researches and sustainable use of ecosystems in the Wangdol-cho.

Summit

Seabed

Marine geology

Seafloor Spreading

Geological survey

10.9719/eeg.2014.47.5.533

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Citations (6)