Visualization of Green's function anomalies for megathrust source in Nankai Trough by reciprocity method

• Material Type: 記事
• Title: Visualization of Green's function anomalies for megathrust source in Nankai Trough by reciprocity method
• Author/Editor: Anatoly Petukhin; Ken Miyakoshi; Masato Tsurugi
• Publication, Distribution, etc.: 日本 : Springer science+business media
• Publication Date: 2016-01-15
• Publication Date (W3CDTF): 2016-01-15
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 68(4)
• Volume: 68(4)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-016-0385-5; https://doi.org/10.1186/s40623-016-0385-5
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• Date Accepted (W3CDTF): 2016-04-22T20:37:43+09:00
• Date Captured (W3CDTF): 2016-02-20
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• Periodical Title (URI): https://www.earth-planets-space.com/content/68/January/2016
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• Bibliographic ID (NDL): 9963603; http://id.ndl.go.jp/bib/9963603
• Bibliographic Record Category (NDL): 632

• Summary, etc.: We used simulation by the reciprocity method to visualize the distribution of Green's function amplitudes in the source of a megathrust earthquake in the Nankai Trough and considered the effects of various areas (asperities or strong motion generation areas) on the simulated long-period ground motions at Konohana in the Osaka basin. We employed a fault source model proposed for an anticipated M9-class event in the Nankai Trough and the 3D Japan Intergrated Velocity Structure Model developed for simulations of long-period ground motions in Japan. Green's functions were calculated for about 1400 subsources by combining the finite-difference method and the reciprocity approach. Depths, strikes, and dips of subsources were adjusted to the shape of the upper boundary of the Philippine Sea plate. Ground motions with periods of 4-20 s were considered. The simulated distribution of peak amplitudes of Green's functions identified two strongly anomalous areas: (1) a large along-strike elongated area just south of the Kii Peninsula and (2) a parallel area closer to the trench. The elongation of the anomalies corresponded well with depth isolines at the top of the Philippine Sea plate. Postulating that plate shape influences simulated ground motions, we investigated the effect on Green's function amplitudes of phenomena related to plate shape: radiation pattern; variations of medium properties (e.g., velocity and density) at subsource depths; depth, strike, and dip; and the effect of soft sediments. We suggest that the cumulative effect on Green's function amplitudes of subsource radiation patterns, medium properties at subsource depth, reflection from crustal interfaces, and passage through soft sedimentary layers plays a critical role in the formation of amplitude anomalies. Analysis of waveforms and the time delay of peak amplitude demonstrate that large-amplitude waves of Green's functions in shallow parts of the plate boundary are composed mostly of surface waves.
• DOI: 10.1186/s40623-016-0385-5; https://doi.org/10.1186/s40623-016-0385-5
• Access Restrictions: インターネット公開
• Rights (production): © 2016 Petukhin et al. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
• Related Material (URI): http://hdl.handle.net/2433/212433; http://id.ndl.go.jp/digimeta/9963603; https://dl.ndl.go.jp/pid/9963603; http://link.springer.com/content/pdf/10.1186/s40623-016-0385-5.pdf; http://link.springer.com/article/10.1186/s40623-016-0385-5/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-016-0385-5
• Is Referenced By: Determining effective earthquake countermeasures for bridges considering seismic and tsunami hazards based on expected post-disaster recovery time; https://cir.nii.ac.jp/crid/1360025431096554240; Modeling of Long-Period Ground Motions in the Nankai Subduction Zone: Model Simulation Using the Accretionary Prism Derived from Oceanfloor Local S-Wave Velocity Structures; https://cir.nii.ac.jp/crid/1360285706120541056; Modelling high-frequency seismograms at ocean bottom seismometers: effects of heterogeneous structures on source parameter estimation for small offshore earthquakes and shallow low-frequency tremors; https://cir.nii.ac.jp/crid/1360290617852195456; グリーン関数の震源位置依存性と強震動生成域の配置が計算地震動に与える影響; https://cir.nii.ac.jp/crid/1390006740592649472; 地震波解析と波動伝播計算に基づく地球内部の短波長不均質構造の研究; https://cir.nii.ac.jp/crid/1390564238076151040; Moment tensor inversion of the 2016 southeast offshore Mie earthquake in the Tonankai region using a three-dimensional velocity structure model : effects of the accretionary prism and subducting oceanic plate; https://cir.nii.ac.jp/crid/2050588892078338432; OpenSWPC : an open-source integrated parallel simulation code for modeling seismic wave propagation in 3D heterogeneous viscoelastic media; https://cir.nii.ac.jp/crid/2051714791980357120
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• Bibliographic ID (NDL): 9963603; http://id.ndl.go.jp/bib/9963603
• NAID: 120005756326