Source parameters of the 2022 ML 6.6 Guanshan (Taiwan) earthquake determined through teleseismic P-wave inversion and rupture directivity analysis

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Ruey-Der Hwang, Chiung-Yao Lin, Cai-Yi Lin
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引用次数: 0

Abstract

Two closely timed moderate-sized earthquakes (e.g., the ML 6.6 Guanshan and ML 6.8 Chihshang earthquakes) occurred in eastern Taiwan on 17–18 September 2002. To understand the rupture relationship between the two earthquakes, we used a teleseismic P-wave inversion and rupture directivity analysis to investigate the source parameters of the ML 6.6 Guanshan earthquake. The teleseismic P-wave inversion method assumed earthquake rupture to be a single source to determine the focal mechanism, seismic moment, and azimuth-dependent source duration for the Guanshan earthquake. The rupture directivity analysis using the azimuth-dependent source duration showed that the Guanshan earthquake unilaterally ruptured along a west-dipping fault plane (Central Range fault) with a rupture velocity (Vr) of approximately 2.8 km/s from the hypocenter toward the deeper part of the fault. Furthermore, through time-domain deconvolution, the source time function of the Guanshan earthquake approximated an isosceles triangle, which also indicated that the earthquake rupture was relatively simple. Here, we propose a fault-based relationship between the ML 6.6 Guanshan and ML 6.8 Chihshang earthquakes. After the ML 6.6 Guanshan earthquake, the source area was relocked, preventing the Chihshang earthquake from rupturing southward. Instead, it ruptured the fault from south to north.

通过远震 P 波反演和破裂指向性分析确定的 2022 年 ML 6.6(台湾)关山地震震源参数
2002 年 9 月 17 日至 18 日,台湾东部发生了两次时间相近的中等规模地震(如 ML 6.6 关山地震和 ML 6.8 嘉义地震)。为了了解这两次地震之间的破裂关系,我们利用远震 P 波反演和破裂指向性分析来研究 ML 6.6 关山地震的震源参数。远震 P 波反演法假定地震破裂为单一震源,以确定关山地震的震源机制、地震力矩和与方位角相关的震源持续时间。利用与方位角相关的震源持续时间进行的断裂指向性分析表明,关山地震沿西倾断层面(中央山脉断层)单侧断裂,断裂速度(Vr)约为 2.8 千米/秒,由震中向断层深部延伸。此外,通过时域解卷积,关山地震的震源时间函数近似于等腰三角形,这也表明地震破裂相对简单。在此,我们提出了 ML 6.6 关山地震和 ML 6.8 赤峰地震之间基于断层的关系。ML 6.6 关山地震发生后,震源区被重新锁定,导致池上地震无法向南发生。相反,它使断层自南向北断裂。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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