继承成熟的梁山断层的第四纪地表断裂:对韩国东南部板内地震的影响

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Sangmin Ha, Hee-Cheol Kang, Seongjun Lee, Yeong Bae Seong, Jeong-Heon Choi, Seok-Jin Kim, Moon Son
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引用次数: 0

摘要

摘要由于断层带的复杂性,在韩国等板块内地区进行地震预测具有挑战性。本研究采用多种方法和数据源来探测梁山断层沿线的第四纪地表破裂,以改进地震灾害评估。通过分析古地震数据,揭示了地震活动、位移和结构模式。五个坑道遗址的观测结果表明,第四纪期间至少发生过三次断层事件,最近一次地表破裂发生在距今约 3000 年前。这些事件导致的累计位移为 3.1-94.0 米,最大震级估计为 6.7-7.2 级。平均滑动速率为 0.14 毫米/年,这表明这是一个准周期模型,重现间隔可能超过 10 000 年。这种结构模式意味着重新激活了以前存在的断层核心,其几何形状为自上而下向西,造成了右旋走向滑动和轻微的反向滑动。这项研究强调了至少自早更新世以来,沿继承的成熟断层--阳山断层--的持续断裂,为该地区的地震灾害评估提供了宝贵的见解,并为地震预测提供了对板块内地震动力学的更广泛理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quaternary surface ruptures of the inherited mature Yangsan fault: implications for intraplate earthquakes in Southeastern Korea
Abstract. Earthquake prediction in intraplate regions, such as South Korea, is challenging due to the complexity of fault zones. This study employed diverse methods and data sources to detect Quaternary surface rupturing along the Yangsan Fault to improve seismic hazard assessment. Paleoseismic data were analyzed to reveal insights into seismic activity, displacement, and structural patterns. Observations from five trench sites indicate at least three faulting events during the Quaternary, with the most recent surface rupturing occurring approximately 3,000 years ago. These events resulted in a cumulative displacement of 3.1–94.0 m and maximum estimated magnitude of 6.7–7.2. The average slip rate of 0.14 mm/yr suggests a quasi-periodic model with possible recurrence intervals exceeding 10,000 years. The structural patterns imply the reactivation of a pre-existing fault core with top-to-the west geometry, causing a dextral strike-slip with a minor reverse component. This study underscores the continuous faulting along the inherited mature fault, the Yangsan Fault, since at least the Early Pleistocene, contributing valuable insights for seismic hazard assessment in the region and offering a broader understanding of intraplate earthquake dynamics for earthquake prediction.
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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