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The Quaternary slip rate of the Yangsan Fault offshore the SE Korean Peninsula and implications for seismic hazard assessment
Geomatics, Natural Hazards and Risk ( IF 4.2 ) Pub Date : 2021-01-18 , DOI: 10.1080/19475705.2021.1872718
Seonghoon Moon 1, 2 , Han-Joon Kim 1, 2 , Chungho Kim 1 , Hyunggu Jun 1 , Sang-Hoon Lee 1 , Hyeong-Tae Joo 1 , Kwang-Hee Kim 3
Affiliation  

Abstract

The Yangsan Fault, a NNE-trending strike-slip fault, is a pronounced active structure in the Korean Peninsula which recently generated an earthquake with moment magnitude MW 5.5 (ML 5.8) that was the largest instrumentally recorded event in Korea. High-resolution seismic profiles obtained on a dense grid reveal deformation of Quaternary sequences that indicates the offshore extension of the Yangsan Fault to the SE continental shelf of the Korean Peninsula. The offshore fault system comprises a main strand and subsidiary Riedel shears formed by dextral slip. We estimated the Quaternary lateral slip rate of the Riedel shear zone using seismic profiles. The Quaternary slip rate of 0.73 ± 0.07 mm/yr was estimated from the dextral displacement of the base boundary of the Quaternary sequences along the main strand. Modelling of fault activities based on empirical relations incorporating the slip rate indicates that (1) the offshore Riedel shear zone is capable of generating earthquakes with magnitude up to MW 6.07–6.25 with recurrence intervals of 550–1500 years and (2) the individual Riedel shears can generate earthquakes with magnitude less than MW 5.87.



中文翻译:

朝鲜半岛海上梁山断裂的第四纪滑移率及其对地震危险性评估的意义

摘要

梁山断裂是一种北向东向走向的走滑断裂,是朝鲜半岛上一个明显的活动构造,最近发生了地震,震级为M W 5.5(ML5.8),这是韩国最大的乐器录制事件。在致密的网格上获得的高分辨率地震剖面揭示了第四纪层序的变形,表明了梁山断裂带向朝鲜半岛东南大陆架的海上延伸。海上断层系统包括主链和由右旋滑移形成的辅助Riedel剪切机。我们使用地震剖面估算了里德尔剪切带的第四纪侧滑速率。从第四纪序列基本边界沿主链的右旋位移估计第四纪滑移率为0.73±0.07 mm / yr。基于经验关系并结合滑移率对断层活动进行建模表明:(1)海上Riedel剪切带能够产生M级以下的地震W 6.07–6.25,重复间隔为550–1500年,并且(2)单个Riedel剪切机可产生震级小于M W 5.87的地震。

更新日期:2021-01-19
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