Neotectonics of the Eastern Korean Margin Inferred from Back-arc Rifting Structure

Kim, Han Joon; Jou, Hyeong-Tae; Lee, Gwang Hoon

doi:10.1007/s12601-018-0036-9

“…The earthquake-prone region east of Pohang is located on the east side of the extended high gravity anomaly. Except for the Ulleung Fault to the east, no specific tectonic boundaries were observed on the coast or the continental shelf in this area 14,70,74 . The water depths of this region gradually increase seaward from the continental shelf.…”

Section: Southern Area Of Hupo Bankmentioning

confidence: 74%

“…Therefore, if strong magnetic anomalies are observed on sea- www.nature.com/scientificreports/ floor areas without artificial magnetic structures or subsurface mineral resources, the presence of igneous rocks can be inferred. Magmatic activity related to the opening of the East Sea occurred along the eastern coast of the Korean Peninsula, the continental shelf, and the continental slope 14,69,70 . Strong magnetic anomalies were predominant in these areas.…”

Section: Magnetic Anomaliesmentioning

confidence: 99%

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

Kim

¹

,

Kim

²

,

Choi

³

et al. 2022

Sci Rep

1

0

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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.

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“…The earthquake-prone region east of Pohang is located on the east side of the extended high gravity anomaly. Except for the Ulleung Fault to the east, no speci c tectonic boundaries were observed on the coast or the continental shelf in this area 14,57,61 . The water depths of this region gradually increase seaward from the continental shelf.…”

Section: Pohang Offshore Regionmentioning

confidence: 83%

“…Therefore, if strong magnetic anomalies are observed on sea oor areas without arti cial magnetic structures or subsurface mineral resources, the presence of igneous rocks can be inferred. Magmatic activity related to the opening of the East Sea occurred along the eastern coast of the Korean Peninsula, the continental shelf, and the continental slope 14,56,57 . Strong magnetic anomalies were predominant in these areas.…”

Section: Magnetic Anomaliesmentioning

confidence: 99%

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

Kim

¹

,

Kim

²

,

Choi

³

et al. 2022

Preprint

0

View full text Add to dashboard Cite

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.

show abstract

Spatiotemporal Seismicity Evolution and Seismic Hazard Potentials in the Western East Sea (Sea of Japan)

Hong

¹

,

Park

²

,

Lee

³

et al. 2020

Pure Appl. Geophys.

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Neotectonics of the Eastern Korean Margin Inferred from Back-arc Rifting Structure

Cited by 10 publications

References 31 publications

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

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

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

Spatiotemporal Seismicity Evolution and Seismic Hazard Potentials in the Western East Sea (Sea of Japan)

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