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Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake

Field investigations and analyses of satellite images and aerial photographs reveal that the 2016 M (w) 7.1 (Mj 7.3) Kumamoto earthquake produced a ∼40-km surface rupture zone striking NE-SW on central Kyushu Island, Japan. Coseismic surface ruptures were characterized by shear faults, extensional c...

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Autor principal: Lin, Aiming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Netherlands 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5563349/
https://www.ncbi.nlm.nih.gov/pubmed/28867959
http://dx.doi.org/10.1007/s10950-017-9653-5
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author Lin, Aiming
author_facet Lin, Aiming
author_sort Lin, Aiming
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description Field investigations and analyses of satellite images and aerial photographs reveal that the 2016 M (w) 7.1 (Mj 7.3) Kumamoto earthquake produced a ∼40-km surface rupture zone striking NE-SW on central Kyushu Island, Japan. Coseismic surface ruptures were characterized by shear faults, extensional cracks, and mole tracks, which mostly occurred along the pre-existing NE-SW-striking Hinagu–Futagawa fault zone in the southwest and central segments, and newly identified faults in the northeast segment. This study shows that (i) the Hinagu–Futagawa fault zone triggered the 2016 Kumamoto earthquake and controlled the spatial distribution of coseismic surface ruptures; (ii) the southwest and central segments were dominated by right-lateral strike-slip movement with a maximum in-site measured displacement of up to 2.5 m, accompanied by a minor vertical component. In contrast, the northeast segment was dominated by normal faulting with a maximum vertical offset of up to 1.75 m with a minor horizontal component that formed graben structures inside Aso caldera; (iii) coseismic rupturing initiated at the jog area between the Hinagu and Futagawa faults, then propagated northeastward into Aso caldera, where it terminated. The 2016 M (w) 7.1 Kumamoto earthquake therefore offers a rare opportunity to study the relationships between coseismic rupture processes and pre-existing active faults, as well as the seismotectonics of Aso volcano. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s10950-017-9653-5) contains supplementary material, which is available to authorized users.
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spelling pubmed-55633492017-09-01 Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake Lin, Aiming J Seismol Original Article Field investigations and analyses of satellite images and aerial photographs reveal that the 2016 M (w) 7.1 (Mj 7.3) Kumamoto earthquake produced a ∼40-km surface rupture zone striking NE-SW on central Kyushu Island, Japan. Coseismic surface ruptures were characterized by shear faults, extensional cracks, and mole tracks, which mostly occurred along the pre-existing NE-SW-striking Hinagu–Futagawa fault zone in the southwest and central segments, and newly identified faults in the northeast segment. This study shows that (i) the Hinagu–Futagawa fault zone triggered the 2016 Kumamoto earthquake and controlled the spatial distribution of coseismic surface ruptures; (ii) the southwest and central segments were dominated by right-lateral strike-slip movement with a maximum in-site measured displacement of up to 2.5 m, accompanied by a minor vertical component. In contrast, the northeast segment was dominated by normal faulting with a maximum vertical offset of up to 1.75 m with a minor horizontal component that formed graben structures inside Aso caldera; (iii) coseismic rupturing initiated at the jog area between the Hinagu and Futagawa faults, then propagated northeastward into Aso caldera, where it terminated. The 2016 M (w) 7.1 Kumamoto earthquake therefore offers a rare opportunity to study the relationships between coseismic rupture processes and pre-existing active faults, as well as the seismotectonics of Aso volcano. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s10950-017-9653-5) contains supplementary material, which is available to authorized users. Springer Netherlands 2017-03-21 2017 /pmc/articles/PMC5563349/ /pubmed/28867959 http://dx.doi.org/10.1007/s10950-017-9653-5 Text en © The Author(s) 2017 Open Access 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.
spellingShingle Original Article
Lin, Aiming
Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake
title Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake
title_full Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake
title_fullStr Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake
title_full_unstemmed Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake
title_short Structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 M(w) 7.1 Kumamoto earthquake
title_sort structural features and seismotectonic implications of coseismic surface ruptures produced by the 2016 m(w) 7.1 kumamoto earthquake
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5563349/
https://www.ncbi.nlm.nih.gov/pubmed/28867959
http://dx.doi.org/10.1007/s10950-017-9653-5
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