庆州高密度宽带地震网络(GHBSN)对朝鲜半岛东南部地震活动的新认识

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Geosciences Journal Pub Date : 2024-03-07 DOI:10.1007/s12303-024-0003-7
Dabeen Heo, Tae-Seob Kang, Minook Kim, Byeong Seok Ahn, Hobin Lim, Jaeseoung Han, Kwang-Hee Kim, Junkee Rhie, YoungHee Kim, Jin-Han Ree
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引用次数: 0

摘要

2016 年韩国庆州发生 5.5 级地震,震中靠近历史上几次大地震的假定震中和第四纪断层段,凸显了该地区地震灾害评估的重要性。然而,由于潜在震源的不确定性,评估中到大型地震的可能性具有挑战性。通过密集的地震网络进行微震监测,可以为了解区域地震特征提供重要信息。为调查朝鲜半岛东南部的微震活动,建立了一个广泛的临时地震阵列,即庆州高密度宽带地震网络(GHBSN)。其中包括 2016 年庆州地震序列的余震区。GHBSN 由 200 个宽带台站组成,这些台站位于主震震中周围约 60 × 60 平方公里区域内,间隔约 4.5 公里。从 2017 年 11 月到 2021 年 12 月,共探测到 4,773 个事件,其中 3,935 个事件发生在 GHBSN 范围内。探测到的事件被划分为五个地震区域(不包括采石场爆破点),即 2016 年庆州地震区域、蔚山断层东部、2017 年浦项地震区域、庆州东部近海以及秘阳断层西部。利用 GHBSN 探测到的事件,为朝鲜半岛东南部制定了当地震级表。这反映了 GHBSN 地震站的距离衰减和现场条件。利用基于能量比测量的两种自动检测方法创建了事件目录。这提供了高分辨率的次中心参数,尽管网络的地震环境受到高文化噪声的影响,但完整度(MC)为 0.0。所有地震事件的古腾堡-里希特 b 值估计为 0.82 ± 0.02,GHBSN 内部地震事件的古腾堡-里希特 b 值估计为 1.01 ± 0.02。这意味着地震活动反映了具有代表性的板内地震环境。测试焦点机制解的可获得性表明,GHBSN 的性能优于区域网络。根据地震震级和频率之间的关系,相对大量的小地震可以提供有关致震断层几何特性和作用应力状态的详细信息。通过 GHBSN 进行高精度微震观测和分析,可为了解朝鲜半岛东南部(包括 2016 年庆州地震余震区)的地震发生情况提供前所未有的地震数据集机会。
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New insights on seismic activity in the southeastern Korean Peninsula from the Gyeongju Hi-density Broadband Seismic Network (GHBSN)

The 2016 magnitude (MW) 5.5 Gyeongju earthquake, which occurred in Korea near assumed epicenters of several substantial historical earthquakes and Quaternary fault segments, underscores the importance of seismic hazard assessment in the region. However, uncertainties about potential seismic sources make evaluating the potential for a moderate-to-large earthquake challenging. Microearthquake monitoring through a dense seismic network can provide crucial insights into the regional seismic characteristics. An extensive temporary seismic array known as the Gyeongju Hi-density Broadband Seismic Network (GHBSN) was established to investigate microearthquake activity in the southeastern Korean Peninsula. This included the zone of aftershocks from the 2016 Gyeongju earthquake sequence. The GHBSN comprises 200 broadband stations located at approximately 4.5 km intervals in an area of approximately 60 × 60 km2 around the epicenter of the mainshock. A total of 4,773 events were detected from November 2017 to December 2021, including 3,935 events within the GHBSN. The detected events were categorized into five seismic regions excluding quarry blasting sites, that is, the 2016 Gyeongju earthquake region, eastern part of the Ulsan Fault, 2017 Pohang earthquake region, eastern offshore Gyeongju, and western part of the Miryang Fault. A local magnitude scale was developed for the southeastern Korean Peninsula using events detected through the GHBSN. This reflects the distance attenuation and site conditions of the GHBSN stations for earthquakes. An event catalog was created using two automatic detection methods based on the measurement of the energy ratio. This provided high-resolution hypocenter parameters at a completeness magnitude (MC) of 0.0 despite the seismic environment of the network being exposed to high cultural noise. The Gutenberg-Richter b-value was estimated as 0.82 ± 0.02 for all events and 1.01 ± 0.02 for those inside GHBSN. This implies that the seismicity reflects a representative intraplate seismic environment. Testing the obtainability of the focal mechanism solutions showed that the GHBSN outperformed the regional network. Depending on the relationship between the magnitude and frequency of earthquakes, a relatively large number of small earthquakes can provide detailed information on the geometric properties of the causative faults and the state of the acting stress. High-precision microearthquake observation and analysis through GHBSN could provide an unprecedented opportunity with seismic datasets to understand the seismogenesis of the southeastern Korean Peninsula, including the zone of aftershocks of the 2016 Gyeongju earthquake.

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来源期刊
Geosciences Journal
Geosciences Journal 地学-地球科学综合
CiteScore
2.70
自引率
8.30%
发文量
33
审稿时长
6 months
期刊介绍: Geosciences Journal opens a new era for the publication of geoscientific research articles in English, covering geology, geophysics, geochemistry, paleontology, structural geology, mineralogy, petrology, stratigraphy, sedimentology, environmental geology, economic geology, petroleum geology, hydrogeology, remote sensing and planetary geology.
期刊最新文献
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