The cause of heavy damage concentration in downtown Mashiki inferred from observed data and field survey of the 2016 Kumamoto earthquake

• Material Type: 記事
• Title: The cause of heavy damage concentration in downtown Mashiki inferred from observed data and field survey of the 2016 Kumamoto earthquake
• Author/Editor: Hiroshi Kawase; Shinichi Matsushima; Fumiaki Nagashima
• Publication, Distribution, etc.: 日本 : Springer Nature
• Publication Date: 2017-01-03
• Publication Date (W3CDTF): 2017-01-03
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 69(3)
• Volume: 69(3)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-016-0591-1; https://doi.org/10.1186/s40623-016-0591-1
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• Date Accepted (W3CDTF): 2017-04-04T20:19:14+09:00
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• Summary, etc.: To understand the cause of heavy structural damage during the mainshock (on April 16, 2016) of the 2016 Kumamoto earthquake sequence, we carried out a field survey from April 29 through May 1, 2016, in Mashiki where heavy damage concentration was observed. The heavy damage concentration in downtown Mashiki could be understood based on the observed strong motions with the Japan Meteorological Agency instrumental seismic intensity of VII and information collected by the field investigation. First, the fundamental features of the structural damage in downtown Mashiki were summarized. Then, a distribution map of peak frequencies was derived from horizontal-to-vertical spectral ratios of microtremors. We could not see any systematic correlation between the peak frequencies and spatial distribution of damage ratios. We also analyzed observed strong motion data at two sites to obtain fling-step-like motions in the displacement time histories through the double integration of unfiltered accelerograms. It turned out that at both strong motion observation sites in Mashiki, only the east–west (EW) components had very strong velocity pulses westward before the emergence of the fling-step-like motion eastward, which would be the primary cause of heavy structural damage in downtown Mashiki, not site effects nor the fling-step-like motion itself.
• DOI: 10.1186/s40623-016-0591-1; https://doi.org/10.1186/s40623-016-0591-1
• Access Restrictions: インターネット公開
• Rights (production): © The Author(s) 2017. 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/2433/218661; http://id.ndl.go.jp/digimeta/10319654; https://dl.ndl.go.jp/pid/10319654; http://link.springer.com/content/pdf/10.1186/s40623-016-0591-1.pdf; http://link.springer.com/article/10.1186/s40623-016-0591-1/fulltext.html
• Is Referenced By: Simulation of building damage distribution in downtown Mashiki, Kumamoto, Japan caused by the 2016 Kumamoto earthquake based on site-specific ground motions and nonlinear structural analyses; https://cir.nii.ac.jp/crid/1050292706231200896; Site Effects Analysis of Shallow Subsurface Structures at Mashiki Town, Kumamoto, Based on Microtremor Horizontal-to-Vertical Spectral Ratios; https://cir.nii.ac.jp/crid/1360013172413328640; Ecosystem changes following the 2016 Kumamoto earthquakes in Japan: Future perspectives; https://cir.nii.ac.jp/crid/1360285706539836544; Strong ground motion simulations of the 2016 Kumamoto earthquakes using corrected empirical Green’s functions: methods and results for ESG6 blind prediction Steps 2 and 3 with improved parameters; https://cir.nii.ac.jp/crid/1360584340723916928; 2016年熊本地震最大前震 (Mj6.5) のKiK-net益城観測点における大加速度振幅の要因分析及び基盤地震動の推定; https://cir.nii.ac.jp/crid/1390001205357366784; 2016年熊本地震で益城町に現れた震災の島とその生成要因の考察; https://cir.nii.ac.jp/crid/1390001205357920384; 熊本地震における宅地擁壁の崩壊状況調査に基づいた模型振動実験及びそのシミュレーション解析; https://cir.nii.ac.jp/crid/1390003825184185856; 熊本県益城町の造成宅地での高密度常時微動計測の広域実施によるH/Vスペクトルと地震被害の関係; https://cir.nii.ac.jp/crid/1390282681473824640; 1988年から2016年までに観測された強震記録から分離したサイト特性に関する研究; https://cir.nii.ac.jp/crid/1390282763119186560; 2016年熊本地震の益城町木造家屋の被害方向に及ぼした入力地震動特性と被害木造家屋の敷地配置角度の影響; https://cir.nii.ac.jp/crid/1390287142241718784; Small-displacement linear surface ruptures of the 2016 Kumamoto earthquake sequence detected by ALOS-2 SAR interferometry; https://cir.nii.ac.jp/crid/2050870366936052352
• References: Application of Horizontal-to-Vertical Spectral Ratios of Earthquake Ground Motions to Identify Subsurface Structures at and around the K-NET Site in Tohoku, Japan; https://cir.nii.ac.jp/crid/1360285713167347200; Correlation of JMA instrumental seismic intensity with strong motion parameters; https://cir.nii.ac.jp/crid/1362262943984400640; Space and Time Evolution of Rupture and Faulting during the 1999 Izmit (Turkey) Earthquake; https://cir.nii.ac.jp/crid/1362825893548337408; The Optimal Use of Horizontal-to-Vertical Spectral Ratios of Earthquake Motions for Velocity Inversions Based on Diffuse-Field Theory for Plane Waves; https://cir.nii.ac.jp/crid/1362825895114149376; The Cause of the Damage Belt in Kobe: "The Basin-Edge Effect," Constructive Interference of the Direct S-Wave with the Basin-Induced Diffracted/Rayleigh Waves; https://cir.nii.ac.jp/crid/1363951793362966912; Computer Simulation of Strong Ground Motion near a Fault Using Dynamic Fault Rupture Modeling: Spatial Distribution of the Peak Ground Velocity Vectors; https://cir.nii.ac.jp/crid/1363951794993775232; Recent progress of seismic observation networks in Japan⿢Hi-net and F-net and K-NET and KiK-net; https://cir.nii.ac.jp/crid/1390001206512426624; 微動と地震動の観測水平上下スペクトル比の相違とそれに着目した地盤構造同定手法の提案; https://cir.nii.ac.jp/crid/1390282680334467712
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