3D Surface Displacement and Surface Ruptures Associated with the 2014 Mw 6.2 Nagano Earthquake Using Differential Lidar

Abstract

Research Article| January 22, 2019 3D Surface Displacement and Surface Ruptures Associated with the 2014 Mw 6.2 Nagano Earthquake Using Differential Lidar Daisuke Ishimura; Daisuke Ishimura aDepartment of Geography, Tokyo Metropolitan University, 1‐1 Minami‐Osawa, Hachioji City, Tokyo 192‐0397, Japan, ishimura@tmu.ac.jp Search for other works by this author on: GSW Google Scholar Shinji Toda; Shinji Toda bInternational Research Institute of Disaster Science (IRIDeS), Tohoku University, 468‐1 Aoba, Aoba‐ku, Sendai City 980‐0845, Japan, toda@irides.tohoku.ac.jp Search for other works by this author on: GSW Google Scholar Sakae Mukoyama; Sakae Mukoyama cDepartment of Research & Development of Kokusai Kogyo Co., Ltd., 2‐24‐1 Harumi‐cho, Fuchu City, Tokyo 183‐0057, Japan, sakae_mukoyama@kk-grp.jp, shinichi_homma@kk-grp.jp, kyoko_furuhashi@kk-grp.jp Search for other works by this author on: GSW Google Scholar Shin'ichi Homma; Shin'ichi Homma cDepartment of Research & Development of Kokusai Kogyo Co., Ltd., 2‐24‐1 Harumi‐cho, Fuchu City, Tokyo 183‐0057, Japan, sakae_mukoyama@kk-grp.jp, shinichi_homma@kk-grp.jp, kyoko_furuhashi@kk-grp.jp Search for other works by this author on: GSW Google Scholar Kyoko Yamaguchi; Kyoko Yamaguchi cDepartment of Research & Development of Kokusai Kogyo Co., Ltd., 2‐24‐1 Harumi‐cho, Fuchu City, Tokyo 183‐0057, Japan, sakae_mukoyama@kk-grp.jp, shinichi_homma@kk-grp.jp, kyoko_furuhashi@kk-grp.jp Search for other works by this author on: GSW Google Scholar Naoya Takahashi Naoya Takahashi dDepartment of Earth Science, Tohoku University, 6‐3 Aoba, Aoba‐ku, Sendai City 980‐8578, Japan, naoya.takahashi.t1@dc.tohoku.ac.jp Search for other works by this author on: GSW Google Scholar Author and Article Information Daisuke Ishimura aDepartment of Geography, Tokyo Metropolitan University, 1‐1 Minami‐Osawa, Hachioji City, Tokyo 192‐0397, Japan, ishimura@tmu.ac.jp Shinji Toda bInternational Research Institute of Disaster Science (IRIDeS), Tohoku University, 468‐1 Aoba, Aoba‐ku, Sendai City 980‐0845, Japan, toda@irides.tohoku.ac.jp Sakae Mukoyama cDepartment of Research & Development of Kokusai Kogyo Co., Ltd., 2‐24‐1 Harumi‐cho, Fuchu City, Tokyo 183‐0057, Japan, sakae_mukoyama@kk-grp.jp, shinichi_homma@kk-grp.jp, kyoko_furuhashi@kk-grp.jp Shin'ichi Homma cDepartment of Research & Development of Kokusai Kogyo Co., Ltd., 2‐24‐1 Harumi‐cho, Fuchu City, Tokyo 183‐0057, Japan, sakae_mukoyama@kk-grp.jp, shinichi_homma@kk-grp.jp, kyoko_furuhashi@kk-grp.jp Kyoko Yamaguchi cDepartment of Research & Development of Kokusai Kogyo Co., Ltd., 2‐24‐1 Harumi‐cho, Fuchu City, Tokyo 183‐0057, Japan, sakae_mukoyama@kk-grp.jp, shinichi_homma@kk-grp.jp, kyoko_furuhashi@kk-grp.jp Naoya Takahashi dDepartment of Earth Science, Tohoku University, 6‐3 Aoba, Aoba‐ku, Sendai City 980‐8578, Japan, naoya.takahashi.t1@dc.tohoku.ac.jp Publisher: Seismological Society of America First Online: 29 Jan 2019 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2019) 109 (2): 780–796. https://doi.org/10.1785/0120180020 Article history First Online: 29 Jan 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Daisuke Ishimura, Shinji Toda, Sakae Mukoyama, Shin'ichi Homma, Kyoko Yamaguchi, Naoya Takahashi; 3D Surface Displacement and Surface Ruptures Associated with the 2014 Mw 6.2 Nagano Earthquake Using Differential Lidar. Bulletin of the Seismological Society of America 2019;; 109 (2): 780–796. doi: https://doi.org/10.1785/0120180020 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 Detailed locations of surface ruptures and the distribution of deformation associated with large earthquakes offer insights to understand subsurface fault slip. We estimated the surface rupture traces and the distribution of near‐fault offset during the 2014 Nagano earthquake in Japan (⁠Mw 6.2) using pre‐ and postearthquake topographic data acquired by light detection and ranging (lidar) surveys. We conducted differential lidar (Dlidar) analysis based on the particle image velocimetry (PIV) method applied to the high‐resolution 2013–2015 lidar dataset. The results show the 3D displacement (vertical and horizontal) due to the 2014 event and surface ruptures on the displacement map as clear contrast. The 2014 surface rupture zone is divided into the northern and the southern subsegments based on the surface offset distribution and geometry of the surface rupture. Moreover, we calculated the dip angles using the amount of vertical offset and horizontal contraction and estimated subsurface fault geometry of both subsegments. Furthermore, we detected broad (⁠∼1–2 km⁠) horizontal contractions on the northern and southern extensions of surface ruptures, reflecting a deep part rupture. The surface rupture traces and vertical offset distribution from our analysis are consistent with the slip distribution from geodetic and seismological models; this fact ensures that the Dlidar analysis is useful for understanding the crustal movements in the future because of the increasing use of lidar data. 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