Miocene tectonic evolution of the basins and fault systems, SE Korea: dextral, simple shear during the East Sea (Sea of Japan) opening

Son, Moon; Song, Cheol Woo; Kim, M.-C.; Cheon, Youngbeom; Cho, H.; Sohn, Young Kwan

doi:10.1144/jgs2014-079

Cited by 72 publications

(91 citation statements)

References 52 publications

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“…Our new model shows that a reconstruction of the Japan Sea opening that is consistent with crustal thicknesses and paleomagnetic data does not require large‐scale dextral along the strike‐slip faults bounding the Japan Sea. In contrast, our model predicts a phase of sinistral transpression in southwesternmost Honshu and the Tsushima and Goto islands from ~17 to 15 Ma, consistent with observed Middle Miocene deformation along the Tsushima‐Goto fault system (Fabbri et al, ; Son et al, ).…”

Section: Reconstruction Of Nw Pacific Active Marginssupporting

confidence: 88%

“…A recent study by Cheon et al () shows that the Yangsan fault did not accommodate any significant dextral motion during the opening of the Japan Sea, but earlier. Structural and stratigraphic data from the Korea Strait islands suggest 22–16 Ma dextral displacement on the Tsushima‐Goto fault system (Fabbri et al, ), followed by a minor sinistral reactivation upon Middle Miocene basin inversion (Fabbri et al, ; Son et al, ). The amount of displacement along this fault remains poorly constrained, however.…”

Section: Reviewmentioning

confidence: 99%

“…Since ~15 Ma, the southwestern part of the Japanese islands are dominated by inversion tectonics, which may relate to the collision of the Philippine Sea plate due to a change in plate motion associated with a regional plate reorganization (e.g., Kimura et al, ; Sibuet et al, ; Son et al, ). Estimates of the shortening associated with the recent tectonics are in the order of tens of kilometers and are not taken into account in this reconstructed.…”

Section: Reconstruction Of Nw Pacific Active Marginsmentioning

confidence: 99%

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Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

2019

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The Eocene (~50–45 Ma) major absolute plate motion change of the Pacific plate forming the Hawaii‐Emperor bend is thought to result from inception of Pacific plate subduction along one of its modern western trenches. Subduction is suggested to have started either spontaneously, or result from subduction of the Izanagi‐Pacific mid‐ocean ridge, or from subduction polarity reversal after collision of the Olyutorsky arc that was built on the Pacific plate with NE Asia. Here we provide a detailed plate‐kinematic reconstruction of back‐arc basins and accreted terranes in the northwest Pacific region, from Japan to the Bering Sea, since the Late Cretaceous. We present a new tectonic reconstruction of the intraoceanic Olyutorsky and Kronotsky arcs, which formed above two adjacent, oppositely dipping subduction zones at ~85 Ma within the north Pacific region, during another Pacific‐wide plate reorganization. We use our reconstruction to explain the formation of the submarine Shirshov and Bowers Ridges and show that if marine magnetic anomalies reported from the Aleutian Basin represent magnetic polarity reversals, its crust most likely formed in an ~85‐ to 60‐Ma back‐arc basin behind the Olyutorsky arc. The Olyutorsky arc was then separated from the Pacific plate by a spreading ridge, so that the ~55‐ to 50‐Ma subduction polarity reversal that followed upon Olyutorsky‐NE Asia collision initiated subduction of a plate that was not the Pacific. Hence, this polarity reversal may not be a straightforward driver of the Eocene Pacific plate motion change, whose causes remain enigmatic.

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Section: Reconstruction Of Nw Pacific Active Marginssupporting

confidence: 88%

Section: Reviewmentioning

confidence: 99%

Section: Reconstruction Of Nw Pacific Active Marginsmentioning

confidence: 99%

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Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

2019

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“…There have been several reports of Quaternary faulting with surface ruptures along the Yangsan-Ulsan Fault System [51,53]. The distribution of Quaternary faults and mechanisms involved are consistent with the maximum principal stress direction (E-W; ENE-WSW) during the Quaternary period [54][55][56]. The recorded seismic data along this area suggest that this area has experienced four moderate magnitude earthquakes (Mw 5-6) during the last 14 years, including the 2016 Gyeongju earthquake (Mw 5.5) and the 2017 Pohang earthquake (Mw 5.4) [47][48][49].…”

Section: Geological Settingsmentioning

confidence: 80%

Land Damage Mapping and Liquefaction Potential Analysis of Soils from the Epicentral Region of 2017 Pohang Mw 5.4 Earthquake, South Korea

et al. 2020

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Studies on earthquake-induced liquefaction and identification of source unit for causing liquefaction have been a major concern in sustainable land use development especially in low to moderate seismic areas. During the 2017 M w 5.4 Pohang earthquake, widespread liquefaction was reported around the Heunghae basin, which was the first ever reported case of liquefaction in the modern seismic history of Korea. The epicentral area is one of the major industrial hubs along the SE Korean Peninsula with no detailed liquefaction hazard map. The purpose of this study was to determine the land damage classification on the basis of surface manifestation of liquefaction features and carry out detailed liquefaction potential analysis to delineate the depth of liquefiable soil. This will eventually support developing a liquefaction hazard zonation map and sustainable development of infrastructure to minimize earthquake damages. In this present study, the southern part of the Heunghae basin, which has more field evidences of liquefaction than the northern part, was taken for detailed liquefaction analysis. From the detailed analysis, it was observed that the soils from 1.5 to 15 m depth with the probability of liquefaction varying from 2 to 20 are prone to liquefaction. On the basis of land damage pattern, the epicentral area falls in orange to red zone, which means the necessity of further detailed liquefaction analysis. This study urges more detailed liquefaction zonation should be carried out for the epicentral area and liquefaction hazard should be included in the multi-hazard map in the future for the sustainable land use planning.

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“…While the active faults in southeastern Korea are well studied and thought to be capable of causing earthquakes as large as magnitude 6.5 to 7.3 (e.g. Kim et al, 2007;Kyung, 2010;Son et al, 2015), those in central western Korea including SMR have not been mapped well. Although details of the active faults in the Korean peninsula is an open question, two faults with lengths up to 2 km have been identified near the epicenter of the 2010 Siheung earthquake in the 1:50,000 scale Geological Map of Korea (KIGAM, 1975).…”

Section: Discussionmentioning

confidence: 99%

Recent Observations of Micro-earthquakes and Its Implications for Seismic Risk in the Seoul Metropolitan Region, Korea

Kim¹,

Han²,

Kim³

et al. 2016

The Journal of the Petrological Society of Korea

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A moment magnitude 3.1 earthquake occurred in the Seoul metropolitan region (SMR), Korea, on 9 February 2010. The unexpected shaking attracted much attention and raised concerns about the seismic hazards and risks in the SMR, which was regarded as an area safe from any earthquake hazard. The SMR has a population of 25 million and is one of the largest metropolitan areas in the world. A shakemap for a scenario earthquake with magnitude 6.5 and focal depth 12 km implies that the SMR will be exposed to serious risk because of its large population and the high vulnerability of its buildings. Although the instrumentally recorded earthquakes discussed in this article cannot be classified as major events, they should not be discounted as insignificant. Considering the low seismicity, micro-earthquakes below the magnitude of a conventional seismic network can achieve would be used to estimate background information in the evaluation of earthquake hazards and risks.

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Miocene tectonic evolution of the basins and fault systems, SE Korea: dextral, simple shear during the East Sea (Sea of Japan) opening

Cited by 72 publications

References 52 publications

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

Land Damage Mapping and Liquefaction Potential Analysis of Soils from the Epicentral Region of 2017 Pohang Mw 5.4 Earthquake, South Korea

Recent Observations of Micro-earthquakes and Its Implications for Seismic Risk in the Seoul Metropolitan Region, Korea

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