Ground‐Motion Characteristics and Nonlinear Soil Response Observed by DONET1 Seafloor Observation Network during the 2016 Southeast Off‐Mie, Japan, Earthquake

Research Article| April 16, 2019 Ground‐Motion Characteristics and Nonlinear Soil Response Observed by DONET1 Seafloor Observation Network during the 2016 Southeast Off‐Mie, Japan, Earthquake Hisahiko Kubo; Hisahiko Kubo Corresponding Author aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Takeshi Nakamura; Takeshi Nakamura aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Wataru Suzuki; Wataru Suzuki aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Yadab P. Dhakal; Yadab P. Dhakal aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Takeshi Kimura; Takeshi Kimura aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Takashi Kunugi; Takashi Kunugi aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Narumi Takahashi; Narumi Takahashi aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Shin Aoi Shin Aoi aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Search for other works by this author on: GSW Google Scholar Author and Article Information Hisahiko Kubo Corresponding Author aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Takeshi Nakamura aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Wataru Suzuki aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Yadab P. Dhakal aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Takeshi Kimura aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Takashi Kunugi aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Narumi Takahashi aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Shin Aoi aNational Research Institute for Earth Science and Disaster Resilience, 3‐1, Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, hkubo@bosai.go.jp Publisher: Seismological Society of America First Online: 16 Apr 2019 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2019) 109 (3): 976–986. https://doi.org/10.1785/0120170296 Article history First Online: 16 Apr 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Hisahiko Kubo, Takeshi Nakamura, Wataru Suzuki, Yadab P. Dhakal, Takeshi Kimura, Takashi Kunugi, Narumi Takahashi, Shin Aoi; Ground‐Motion Characteristics and Nonlinear Soil Response Observed by DONET1 Seafloor Observation Network during the 2016 Southeast Off‐Mie, Japan, Earthquake. Bulletin of the Seismological Society of America 2019;; 109 (3): 976–986. doi: https://doi.org/10.1785/0120170296 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 Strong ground motions of the 2016 southeast off‐Mie, Japan, earthquake (⁠MJMA 6.5) were recorded by the eastern Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET1) seafloor observation network in the Nankai subduction zone. The observed values in peak ground velocity and acceleration response spectra (SA) at periods of 0.5–8 s at seafloor stations were much larger than those predicted by the empirical attenuation relationship. The observed values were primarily caused by the strong site amplification effect due to the subsurface structure, such as an accretionary wedge and shallow soft sediments. On the other hand, the observed values in peak ground acceleration and SA at periods of 0.12 and 0.25 s follow the empirical relationship, which is inconsistent with the strong site amplification effect suggested by spectral inversion. To understand this inconsistency, we investigate the nonlinear soil response at DONET1 stations during this event using time–frequency analyses and S‐wave horizontal‐to‐vertical spectral ratios. The analyses indicate that a significant nonlinear soil response occurred at several stations. This nonlinear soil behavior partially contributed to the suppression of the amplification of short‐period ground motions at DONET1 stations during the 2016 southeast off‐Mie earthquake. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.