Crustal structure, volcanism, and opening mode of the Ulleung Basin, East Sea (Sea of Japan)

Lee, Gwang H.; Kim, Han J.; Suh, Man Cheol; Hong, Jong Kuk

doi:10.1016/s0040-1951(99)00113-4

Cited by 61 publications

(53 citation statements)

References 47 publications

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“…Kim, 1992;Lee et al, 1999;Lee et al, 2002b). Lee et al (1999) indicated the existence of a very steep eastward-dipping fault which appears to be related to strike-slip movement of the western Ulleung Basin margin, mentioned as the Ulleung Escarpment by Lee et al (2002b). Considering these tectonic conditions and our results, this earthquake may have occurred along a N-S trending reverse fault near the Ulleung Escarpment.…”

Section: Resultsmentioning

confidence: 58%

“…Previous studies showed that there exist strike-slip, thrust and normal fault systems extending N-S to NNE-SSW offshore from the southeastern Korean Peninsula and these systems are related to the opening of the Ulleung Basin and rotation of southwestern Japan (e.g. Kim, 1992;Lee et al, 1999;Lee et al, 2002b). Lee et al (1999) indicated the existence of a very steep eastward-dipping fault which appears to be related to strike-slip movement of the western Ulleung Basin margin, mentioned as the Ulleung Escarpment by Lee et al (2002b).…”

Section: Resultsmentioning

confidence: 99%

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Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2)

Park

Mori

2005

Earth Planet Sp

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A moderate earthquake with local magnitude 5.2 (M L ) occurred off the eastern coast of South Korea on May 29, 2004. This earthquake is one of the largest events near the Korean Peninsula since 1978 when instrumental observations began by the Korea Meteorological Administration. We carried out modeling of regional waveforms and deconvolutions using empirical Green functions to estimate source parameters. The results of the regional waveform modeling show a reverse fault mechanism with a hypocentral depth of 8 km and seismic moment of 5 × 10 16 N · m, which is equivalent to Mw 5.1. Performing the empirical Green function deconvolution, we estimated a fault radius of 1.1 to 1.4 km and an average stress drop of 13.5 MPa, assuming an east dipping fault plane. Assuming a west dipping fault plane, we estimated a fault radius of 1.3 to 2.9 km and an average stress drop of 6.6 MPa.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2)

Park

Mori

2005

Earth Planet Sp

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“…1). 울릉분지는 후기 올리고세에서 초기 마이오세동안 분지열개에 의해 생 성된 후열도 분지(backarc basin)이다 (Lee et al, 1999). 중기 마이오세 말에 동으로는 태평양 판, 남으 로는 필리핀 판에 의한 횡압력이 작용하여 분지가 부 채꼴 모양으로 닫히고 한반도와 일본 열도 사이에서 구조적인 변형이 일어났다 .…”

Section: 000 Kmunclassified

A Preliminary Evaluation on CO₂Storage Capacity of the Southwestern Part of Ulleung Basin, Offshore, East Sea

Kim¹,

Lee²,

Jo³

et al. 2012

Economic and Environmental Geology

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A theoretical CO 2 storage capacity is estimated on the southwestern continental shelf margin of Ulleung Basin, offshore Korea using 2D/3D multi-channel seismic and wellbore data acquired in the area over the two decades since the late 1980s. For the first time in Korea, the present study applies an efficiency factor to the capacity calculation, together with the other required parameters. For possible CO 2 storage volume estimation of the study area, we interpreted the seismic data in the Gorae area from 800 m to 3,000 m below the seafloor integrated with the well data, and identified five different seismic units; the limited depth interval is considered because of fluid state of CO 2 and tightness of the formation. The total volumes of each seismic unit were converted with a time-depth relation inferred from the checkshot surveys before the other required parameters including porosity and density were applied to compute the potential storage capacity. The accumulated possible storage volume from the five depositional units in the study area is estimated to be approximately 5,100 Mton (P 50 ). The approaches made in this study will be applied to the rest area of the basin and other continental shelves (i.e., Yellow Sea and northern part of East China Sea) in the next phase.

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“…In the Japan Basin, the results of seismic studies suggested that the depth of Layer 2A is about 5.5-6.0 km below the sea-surface and that of Layer 2B is about 6.0-7.0 km below the sea-surface (e.g., Hirata et al, 1992). In the Tsushima Basin, studies based on seismic reflection and refraction profiles suggested that the crust is oceanic, but Layer 2A does not exist and there are many volcanic sills and flows in the deeper part of sedimentary layer in the central part of the Tsushima Basin (Kim et al, 1998;Lee et al, 1999). The depth of Layer 2B is about 6.0-7.0 km below the sea-surface.…”

Section: The Characteristics Of Magnetic Structurementioning

confidence: 99%

“…It is important for any understanding of the formation process of the Japan Sea to reveal the features of the crustal structures of their basins. Previous studies based on seismic methods showed that the crust of the eastern part of the Japan Basin has the features of a typical oceanic crust , whereas the crusts of the Yamato and Tsushima Basins are thicker (Hirata et al, 1989;Kim et al, 1994;Kurashimo et al, 1996;Kim et al, 1998;Lee et al, 1999;Nishizawa and Asada, 1999;Kim et al, 2003;Cho et al, 2004;Sato et al, 2006a, b).…”

Section: Introductionmentioning

confidence: 96%

Characteristics of crustal magnetic structures in the Tsushima (Ulleung) and Japan Basins from vector magnetic anomalies

et al. 2007

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Magnetic surveys by a Deep-tow Three-Component Magnetometer (DTCM) were conducted in the northeastern part of the Japan Basin and the central part of the Tsushima (Ulleung) Basin. Magnetic lineations are recognized clearly in the former area, whereas they were not recognized by previous studies in the latter area. The high-quality vector magnetic anomaly data obtained by DTCM enables the precise determination of the strikes of magnetic lineations and the positions of magnetic boundaries. Magnetic anomalies measured by DTCM show the characteristics of linear magnetic anomalies in both basins. The strikes of magnetic lineations are N47• E in the Japan Basin and N82• E in the Tsushima Basin. The estimated magnetization intensities of magnetic source models constructed from the amplitudes of analytic signal calculated from vector anomalies and the crustal structures determined by seismic studies are similar to those of typical extrusive basalt in both basins. The observed anomalies in the Japan Basin contain a short wavelength anomaly which cannot be explained by the model. Their ages may be chrons C5Cr (16.726-17.277 Ma), C5Dn (17.277-17.615 Ma), C5Dr (17.615-18.281 Ma), and subchron C5Dr.1n which was identified by a paleomagnetic study. The estimated half-spreading rate is 2.0 cm/yr, which is slower than that estimated by previous study. The observed anomalies in the Tsushima Basin show that there is a partial magnetization high. This may indicate that not all of the sources of magnetic lineations in the Tsushima Basin changed to low magnetization by the effect of thick sediment cover and the intrusions of a large amount of dikes after the formation.

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Crustal structure, volcanism, and opening mode of the Ulleung Basin, East Sea (Sea of Japan)

Cited by 61 publications

References 47 publications

Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2)

Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2)

A Preliminary Evaluation on CO₂Storage Capacity of the Southwestern Part of Ulleung Basin, Offshore, East Sea

Characteristics of crustal magnetic structures in the Tsushima (Ulleung) and Japan Basins from vector magnetic anomalies

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Crustal structure, volcanism, and opening mode of the Ulleung Basin, East Sea (Sea of Japan)

Cited by 61 publications

References 47 publications

Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2)

Source parameters of the May 29, 2004 South Korea earthquake (ML 5.2)

A Preliminary Evaluation on CO2Storage Capacity of the Southwestern Part of Ulleung Basin, Offshore, East Sea

Characteristics of crustal magnetic structures in the Tsushima (Ulleung) and Japan Basins from vector magnetic anomalies

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A Preliminary Evaluation on CO₂Storage Capacity of the Southwestern Part of Ulleung Basin, Offshore, East Sea