Seismic characteristics of the 2012 Ulsan offshore earthquake sequence

박은희,; 박순천,; 최영진,

doi:10.14770/jgsk.2013.49.4.493

Cited by 2 publications

(1 citation statement)

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“…After the formation of the East Sea, it has been under E-W compressive stress from 5 Ma. Previous studies 20,88,89 suggest that recent earthquakes in the Korean Peninsula and the offshore area of Yeongdeok and Ulsan were also influenced by the compressive stress. Therefore, it was assumed that the unstable tectonic structures associated with the formation of the East Sea, including the Ulleung Basin, have been affected by this stress, resulting in the possibility of earthquakes.…”

Section: Discussionmentioning

confidence: 88%

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

Kim

Choi

et al. 2022

Sci Rep

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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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Section: Discussionmentioning

confidence: 88%