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Ground-motion characteristics and nonlinear soil response observed by DONET1 seafloor observation network during the 2016 southeast off-Mie, Japan, earthquake

Hisahiko Kubo, Takeshi Nakamura, Wataru Suzuki, Yadab P. Dhakal, Takeshi Kimura, Takashi Kunugi, Narumi Takahashi and 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 (April 2019) Pre-Issue Publication

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.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: Pre-Issue Publication
Title: Ground-motion characteristics and nonlinear soil response observed by DONET1 seafloor observation network during the 2016 southeast off-Mie, Japan, earthquake
Affiliation: National Research Institute for Earth Science and Disaster Resilience, Ibaraki, Japan
Published: 20190416
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 34
Accession Number: 2019-037996
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N33°00'00" - N34°00'00", E136°00'00" - E137°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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