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Complex Crustal Deformation of the 2016 Kaikoura, New Zealand, Earthquake Revealed by ALOS‐2

2017; Seismological Society of America; Volume: 107; Issue: 6 Linguagem: Inglês

10.1785/0120170143

1943-3573

Yu Morishita, Tomokazu Kobayashi, Satoshi Fujiwara, Hiroshi Yarai,

Geological and Geochemical Analysis

Research Article| November 07, 2017 Complex Crustal Deformation of the 2016 Kaikoura, New Zealand, Earthquake Revealed by ALOS‐2 Yu Morishita; Yu Morishita aCrustal Deformation Research Division, Geography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811 Japan, morishita-y96pt@mlit.go.jp Search for other works by this author on: GSW Google Scholar Tomokazu Kobayashi; Tomokazu Kobayashi aCrustal Deformation Research Division, Geography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811 Japan, morishita-y96pt@mlit.go.jp Search for other works by this author on: GSW Google Scholar Satoshi Fujiwara; Satoshi Fujiwara bGeography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811, Japan Search for other works by this author on: GSW Google Scholar Hiroshi Yarai Hiroshi Yarai aCrustal Deformation Research Division, Geography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811 Japan, morishita-y96pt@mlit.go.jp Search for other works by this author on: GSW Google Scholar Author and Article Information Yu Morishita aCrustal Deformation Research Division, Geography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811 Japan, morishita-y96pt@mlit.go.jp Tomokazu Kobayashi aCrustal Deformation Research Division, Geography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811 Japan, morishita-y96pt@mlit.go.jp Satoshi Fujiwara bGeography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811, Japan Hiroshi Yarai aCrustal Deformation Research Division, Geography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, 1 Kitasato, Tsukuba, Ibaraki 305‐0811 Japan, morishita-y96pt@mlit.go.jp Publisher: Seismological Society of America First Online: 07 Nov 2017 Online Issn: 1943-3573 Print Issn: 0037-1106 Bulletin of the Seismological Society of America (2017) 107 (6): 2676–2686. https://doi.org/10.1785/0120170143 Article history First Online: 07 Nov 2017 Connected Content Errata: Erratum to Complex Crustal Deformation of the 2016 Kaikoura, New Zealand, Earthquake Revealed by ALOS‐2 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Yu Morishita, Tomokazu Kobayashi, Satoshi Fujiwara, Hiroshi Yarai; Complex Crustal Deformation of the 2016 Kaikoura, New Zealand, Earthquake Revealed by ALOS‐2. Bulletin of the Seismological Society of America 2017;; 107 (6): 2676–2686. doi: https://doi.org/10.1785/0120170143 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract The 2016 Kaikoura earthquake is one of the most complex earthquakes recorded by modern observation techniques. A comprehensive understanding of this event has not yet been achieved, despite the analysis of observed data. To advance clarification of the mechanism of the earthquake, we revealed detailed surface displacement caused by the earthquake using Advanced Land Observing Satellite 2 Synthetic Aperture Radar data and constructed fault models comprising rectangular planes with a uniform slip. Remarkably large and intricate surface displacements were detected in two distinct areas: (1) a southwestern part around the Hundalee fault and The Humps fault zone, and (2) a northeastern part around the Kekerengu fault and the little recognized Papatea fault. A gap where the displacement is relatively small exists between the two major zones of faulting. In the southwestern part, extremely complicated displacements are disclosed in detail and have been modeled as an intricate set of six faults that include previously unknown structures. In the northeastern part, the largest displacement of ∼9 m was detected along the Kekerengu and Papatea faults. The modeled fault plane along the Kekerengu fault shows a large reverse and dextral slip and possibly released the largest seismic moment of all modeled fault segments. The constructed fault model also explains far‐field displacement, indicating that the dominant slip direction was right lateral, consistent with the strain field in this region. The calculated change of Coulomb failure stress (⁠ΔCFS⁠) suggests that the static stress changes by the southwestern fault segments may have contributed to triggering the northeastern fault segments. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.