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东海（日本海）郁陵盆地西南边缘地震多发区的重力和磁异常。

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

作者信息

Kim Chang Hwan, Kim Kwang-Hee, Choi Soon Young, Kim Won Hyuck, Choi Hyun Ok, Park Chan Hong

机构信息

Dokdo Research Center, East Sea Research Institute, Korea Institute of Ocean Science & Technology, Uljin, Republic of Korea.

Department of Geological Science, Pusan National University, Busan, Republic of Korea.

出版信息

Sci Rep. 2022 Oct 13;12(1):17172. doi: 10.1038/s41598-022-21462-3.

DOI:10.1038/s41598-022-21462-3
PMID:36229477
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9561718/
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.

摘要

朝鲜半岛附近的郁陵盆地西南部，海底地震有所增加。本研究分析了该盆地三个地震多发区（湖浦浅滩以及浦项和蔚山附近的近海区域）的重力和磁性特征。在东海形成过程中，该盆地受到拉应力和压应力的影响。湖浦浅滩南部和浦项近海表现出高重力异常和强磁异常。湖浦浅滩与半岛分离，该地区的地震受到地壳断裂的影响，这些断裂在盆地形成过程中促进了火成活动。浦项海岸和大陆坡沿线密集的火山岩和向海倾斜的反射层表明东海形成过程中有岩浆活动。相比之下，蔚山近海有较厚的沉积层，其重力异常略高于周边地区，但磁异常没有显著差异。与盆地形成相关的连续拉应力和压应力在该地区产生了复杂的构造结构。磁倾角导数结果表明地震位于磁源边界附近。结果表明，监测具有重力和磁异常的地震多发区很重要。

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