Analysis of Liquefaction During 2011 East Japan Earthquake – Part 1: Seismic Ground Behavior in Tokyo Port at the 2011 Off Pacific Coast of Tohoku Earthquake – An Effective Stress Dynamic Analysis Focusing on the Impact of the Aftershock

2017 ◽  
pp. 201-217 ◽  
Author(s):  
Yukio Tamari ◽  
Junichi Hyodo ◽  
Koji Ichii ◽  
Takashi Nakama ◽  
Atsushi Hosoo
Keyword(s):  
Dynamic Analysis ◽  
Effective Stress ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
The Impact

scholarly journals Impact of the 2011 off the Pacific coast of Tohoku earthquake on a deep-sea benthic ecosystem: evidence from living and dead benthic foraminifera on the landward slope of the Japan Trench

2018 ◽  
Author(s):  
Akira Tsujimoto ◽  
Ritsuo Nomura ◽  
Hidetaka Nomaki ◽  
Kazuno Arai ◽  
Mutsuo Inoue ◽  
...  
Keyword(s):  
Benthic Foraminifera ◽  
Deep Sea ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Radioactive Material ◽  
Japan Trench ◽  
Sediment Surface ◽  
Foraminiferal Assemblage ◽  
The Pacific ◽  
The Impact

Abstract. We examined the impact of the earthquake and tsunami following the 2011 off the Pacific coast of Tohoku earthquake on the deep-sea benthic ecosystems based on radionuclide and benthic foraminiferal analysis of core sediments, collected from 3200 and 3600 m water depths 5 and 17 months after the earthquake. Radionuclide analysis of the excess 210Pb, 134Cs, and 137Cs indicated that some of the analyzed sediment core recorded deposits before the earthquake, event deposits just after the earthquake, and deposits after the Fukushima Daiichi Nuclear Power Plant accident, which caused the release of a large amount of radioactive material 4 days after the earthquake. Uvigerina senticosa, Chilostomella oolina, and Elphidium batialis were the dominant species in the study area prior to the earthquake. In core 4W-2012, the original or pre-earthquake assemblage layer was covered by 5-cm-thick event deposits following the earthquake that contained a high diversity allochthonous foraminiferal assemblage. Following the episodic deposition, foraminiferal density drastically decreased and many species disappeared, resulting in a decrease in species diversity. Above 10 cm depth in the sediment, living specimens of opportunistic and competitive species gradually increased toward the sediment surface and became dominant in the top 1 cm of the core. Thus, the episodic deposition resulting from the earthquake caused a drastic decrease in the original benthic foraminifera and colonization of opportunistic species with a low diversity within 17 months. Although there were differences in vertical change in the radionuclides and benthic foraminifera between sites, faunal change may have already occurred 5 months after the earthquake.

Special Issue on Challenges of Earthquake Forecast Research Illuminated by the 2011 Tohoku-Oki Earthquake

2014 ◽  
Vol 9 (3) ◽  
pp. 247-247
Author(s):  
Naoshi Hirata ◽  
Aitaro Kato
Keyword(s):  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Observation Data ◽  
Special Issue ◽  
Earthquake Forecast ◽  
Tsunami Forecasting ◽  
Starting Point ◽  
Short And Long Term ◽  
The Impact

The 2011 off the Pacific coast of Tohoku Earthquake, hereafter referred to as Tohoku-Oki earthquake, occurring off northeastern Japan’s Pacific coast on March 11, 2011 had a moment magnitude of 9.0 and generated a tsunami responsible for most of the deaths of the event’s 19,000 victims. Identifying scientifically what happened before, on, and after March 11 is one starting point for a discussion on how to reduce casualties and mitigate the impact of such natural disasters. The 14 papers in this special issue cover incidents related to pre-, co- and post-seismic phenomena, including volcanoes. Three papers discuss why and how such a large quake occurred. Three more papers go into the implications of short- and long-term crustal deformations seen in northeastern Japan. Four papers detail short- and long-term phenomena leading to the Tohoku-Oki quake. Two papers discuss real-time tsunami forecasting based on off-shore and on-shore geodetic, seismic and tsunami observation data. The last two papers explore the effects of the 2011 temblor on volcanic phenomena. The magnitude 9.0 produced in the 2011 event is the largest historically recorded in Japan and may not necessarily have been anticipated beforehand, and the generation mechanism behind such a gigantic occurrence is not yet completely understood. Even so, preparations should be made for such earthquakes in other parts of Japan and in other countries. The Nankai trough is an example of areas that require our attention. A national project for observation and study for earthquake prediction is now being integrated into a new program, Earthquake and Volcano Hazards Observation and Research Program (2014-2019). Studies presented in this special issue are also being supported in part by this program. We are certain that readers will find that this special issue will contribute much to our understanding of gigantic earthquakes and at least some of the measure to be taken in preparation for such natural phenomena. Finally, we extend our sincere thanks to all of the contributors and reviewers involved with these articles.

scholarly journals Dynamic analysis of earth dam damaged by the 2011 Off the Pacific Coast of Tohoku Earthquake

2014 ◽  
Vol 64 ◽  
pp. 50-62 ◽  
Author(s):  
Bhuddarak Charatpangoon ◽  
Junji Kiyono ◽  
Aiko Furukawa ◽  
Chayanon Hansapinyo
Keyword(s):  
Dynamic Analysis ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Earth Dam ◽  
The Pacific

Reproduction Analysis of Short-circuit between Transmission Lines during the 2011 Off the Pacific Coast of Tohoku Earthquake and a Consideration of the cause of the Event

2014 ◽  
Vol 134 (8) ◽  
pp. 732-742 ◽  
Author(s):  
Hiroshi Ohta ◽  
Akio Kawahara ◽  
Hideharu Nakamura ◽  
Motoyuki Yamazaki ◽  
Eijiro Hongo
Keyword(s):  
Transmission Lines ◽  
Pacific Coast ◽  
Short Circuit ◽  
Tohoku Earthquake ◽  
The Pacific

scholarly journals Seawater-leaching Testing for Arsenic and Heavy Metals in Tsunami Deposits Produced by the 2011 off the Pacific Coast of Tohoku Earthquake, Northeastern Japan

2014 ◽  
Vol 123 (6) ◽  
pp. 835-853 ◽  
Author(s):  
Takahiro WATANABE ◽  
Noriyoshi TSUCHIYA ◽  
Shin-ichi YAMASAKI ◽  
Ryoichi YAMADA ◽  
Nobuo HIRANO ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Tsunami Deposits ◽  
Northeastern Japan ◽  
The Pacific
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