A “sliding box” automatic relocation method based on geometric-mean reverse-time migration

PreviousNext No AccessSecond International Meeting for Applied Geoscience & EnergyA “sliding box” automatic relocation method based on geometric-mean reverse-time migrationAuthors: Tong BaiZhendong ZhangMalcolm C. A. WhiteHongrui QiuPaul WilliamsonNori NakataTong Bai Massachusetts Institute of TechnologySearch for more papers by this author, Zhendong Zhang Massachusetts Institute of TechnologySearch for more papers by this author, Malcolm C. A. White Massachusetts Institute of TechnologySearch for more papers by this author, Hongrui Qiu Massachusetts Institute of TechnologySearch for more papers by this author, Paul Williamson TotalEnergiesSearch for more papers by this author, and Nori Nakata Massachusetts Institute of Technology and Lawrence Berkeley National LaboratorySearch for more papers by this authorhttps://doi.org/10.1190/image2022-3747339.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Regional seismic networks typically monitor and locate seismic sources using only kinematic (i.e., traveltime) observations. We propose an automated “sliding box” procedure to improve source locations by leveraging dynamic (e.g., full waveform) information via Geometric-mean Reverse-Time Migration (GmRTM). We demonstrate the proposed method’s efficacy by selecting and relocating some of the cataloged tectonic earthquakes recorded by a network of ∼250 three-component seismic sensors deployed across 8,000 km2 of mountainous terrain in Central Asia. Each event is recorded with sufficient signal-to-noise ratio (≥4) by at least 8 sensors inside a 20 km × 20 km box centered on the cataloged location. For each event, we extract a local 3-D velocity model, multiply the waveform data by their corresponding STA/LTA ratios to suppress coda waves and other coherent noise, and apply GmRTM to reconstruct high-resolution source images. The automatic procedure reasonably relocates 280 earthquakes. Keywords: elastic, GmRTM, earthquake relocation, automated processingPermalink: https://doi.org/10.1190/image2022-3747339.1FiguresReferencesRelatedDetails Second International Meeting for Applied Geoscience & EnergyISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2022 Pages: 3694 publication data© 2022 Published in electronic format with permission by the Society of Exploration Geophysicists and the American Association of Petroleum GeologistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 15 Aug 2022 CITATION INFORMATION Tong Bai, Zhendong Zhang, Malcolm C. A. White, Hongrui Qiu, Paul Williamson, and Nori Nakata, (2022), "A “sliding box” automatic relocation method based on geometric-mean reverse-time migration," SEG Technical Program Expanded Abstracts : 1516-1520. https://doi.org/10.1190/image2022-3747339.1 Plain-Language Summary KeywordselasticGmRTMearthquake relocationautomated processingPDF DownloadLoading ...