Delineating complex spatiotemporal distribution of earthquake aftershocks: An improved Source-Scanning Algorithm

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题名:	Delineating complex spatiotemporal distribution of earthquake aftershocks: An improved Source-Scanning Algorithm
作者:	許樹坤;Liao, Yen‐Che;Kao, Honn;Rosenberger, Andreas;Hsu, Shu‐Kun;Huang, Bor‐Shouh
贡献者:	地球科學學院地球科學學系
关键词:	Asia;Computational seismology;Earthquake source observations
日期:	2012-06-01
上传时间:	2026-04-23 11:32:00 (UTC+8)
出版者:	Oxford University Press;Oxford, UK: Oxford University Press (OUP)
摘要:	摘要： SUMMARY Conventional earthquake location methods depend critically on the correct identification of seismic phases and their arrival times from seismograms. Accurate phase picking is particularly difficult for aftershocks that occur closely in time and space, mostly because of the ambiguity of correlating the same phase at different stations. In this study, we introduce an improved Source‐Scanning Algorithm (ISSA) for the purpose of delineating the complex distribution of aftershocks without time‐consuming and labour‐intensive phase‐picking procedures. The improvements include the application of a ground motion analyser to separate P and S waves, the automatic adjustment of time windows for ‘brightness’ calculation based on the scanning resolution and a modified brightness function to combine constraints from multiple phases. Synthetic experiments simulating a challenging scenario are conducted to demonstrate the robustness of the ISSA. The method is applied to a field data set selected from the ocean‐bottom‐seismograph records of an offshore aftershock sequence southwest of Taiwan. Although visual inspection of the seismograms is ambiguous, our ISSA analysis clearly delineates two events that can best explain the observed waveform pattern. 出版者： Oxford, UK: Oxford University Press (OUP) 出版日期： 2012-06 出處： Geophysical Journal International, 2012-06, Vol.189 (3), p.1753-1770 資源來源： Alma/SFX Local Collection 版權： 2012 The Authors Geophysical Journal International © 2012 RAS 識別號： ISSN: 0956-540X 識別號： ISSN: 1365-246X 識別號： EISSN: 1365-246X 識別號： DOI: 10.1111/j.1365-246x.2012.05457.x
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