韩国次声波目录(1999-2022 年)

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Junghyun Park, Stephen Arrowsmith, Il-Young Che, Chris Hayward, Brian Stump
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引用次数: 0

摘要

摘要 韩国次声目录(KIC)涵盖 1999 年至 2022 年,描述了丰富多样的声源类型,并记录了时变大气对整个朝鲜半岛事件探测和定位的影响。KIC 是利用南卫理公会大学和韩国地球科学和矿产资源研究院合作运营的六个韩国次声阵列的数据制作的。信号检测依赖于自适应 F-探测器(Arrowsmith 等人,2009 年),该探测器可估算到达时间和后向方位,从而将检测和参数估算区分开来。探测结果和相关参数被输入贝叶斯超声源定位程序(Modrak 等人,2010 年)。由此产生的 KIC 包含 38,455 个次声事件,并记录了多个地点的重复事件。该目录包括许多人为来源,如工业化学品爆炸、石灰石露天矿和采石场爆炸、朝鲜地下核爆炸以及其他来源不明的大气或水下事件。KIC 中的大多数事件都发生在工作时间和工作日,这表明与人类有关的信号占主导地位。多年来,韩国的次声阵列不断扩大,俄罗斯和日本的国际监测系统次声站的数据也被纳入其中,这些都增加了次声事件的数量,并由于方位角监测站覆盖范围的扩大而提高了定位精度。对多个阵列的选定事件和相关信号的审查提供了定位质量评估。我们对伴随地震到达的次声事件(地震声事件)进行量化,以支持声源类型评估。使用 "地对空"(G2S)大气模型进行射线追踪,一般可预测强平流层风时的观测到达时间,但预测的到达时间有很大差异。在某些情况下,当地大气数据能更好地捕捉浅层大气风速的小尺度变化,并能改进 G2S 模式不能很好匹配的到达时间预测。对选定事件的分析还说明了地形效应对对流层次声在局部距离传播的重要性。KIC 是在该地区编制的第一份次声目录,它可以作为一个宝贵的数据集,用于开发更强大的次声源定位和特征描述方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Korean Infrasound Catalog (1999-2022)
Summary The Korean infrasound catalog (KIC) covers 1999 to 2022 and characterizes a rich variety of source types as well as document the effects of the time-varying atmosphere on event detection and location across the Korean Peninsula. The KIC is produced using data from six South Korean infrasound arrays that are cooperatively operated by Southern Methodist University and Korea Institute of Geoscience and Mineral Resources. Signal detection relies on an Adaptive F-Detector (Arrowsmith et al., 2009) that estimates arrival time and backazimuth, which draws a distinction between detection and parameter estimation. Detections and associated parameters are input into a Bayesian Infrasonic Source Location procedure (Modrak et al., 2010). The resulting KIC contains 38,455 infrasound events and documents repeated events from several locations. The catalog includes many anthropogenic sources such as an industrial chemical explosion, explosions at limestone open-pit mines and quarries, North Korean underground nuclear explosions, and other atmospheric or underwater events of unknown origin. Most events in the KIC occur during working hours and days, suggesting a dominance of human-related signals. The expansion of infrasound arrays over the years in South Korea and the inclusion of data from the International Monitoring System infrasound stations in Russia and Japan increase the number of infrasound events and improve location accuracy because of the increase in azimuthal station coverage. A review of selected events and associated signals at multiple arrays provides a location quality assessment. We quantify infrasound events that have accompanying seismic arrivals (seismoacoustic events) to support the source type assessment. Ray tracing using the Ground-to-Space (G2S) atmospheric model generally predicts observed arrivals when strong stratospheric winds exist, although the predicted arrival times have significant discrepancies. In some cases, local atmospheric data better captures small-scale variations in the wind velocity of the shallow atmosphere and can improve arrival time predictions that are not well matched by the G2S model. The analysis of selected events also illustrates the importance of topographic effects on tropospheric infrasound propagation at local distances. The KIC is the first infrasound catalog compiled in this region, and it can serve as a valuable dataset in developing more robust infrasound source localization and characterization methods.
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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