Behavior of the 2011 Tohoku Earthquake Tsunami and Resultant Damage in Tokyo Bay

The behavior of the 2011 Tohoku earthquake tsunami in Tokyo Bay and its resultant damage to the coasts are studied using a field survey, an analysis of observed tsunami wave profiles and numerical hindcasting using FVCOM and Delft3D-Flow. The field survey reveals that the tsunami caused several fishery ports to overflow, and unexpectedly large inundation and run-up heights of 2.84 m and 2.91 m were recorded in Funabashi Fishery Port and Shin-Futtsu Fishery Port, respectively. Examining the observed tsunami wave profiles, the tsunami wave entered the bay with a maximum height of approximately 0.9 m for the second wave and a period of approximately 60 min, propagating along the major axis of the bay with almost uniform height. Numerical hindcasting results using both the models are fairly consistent with the measurements, revealing that the tsunami wave heights are locally amplified in ports because of wave reflection, water accumulation due to their narrow and enclosed shape, and, to some extent, the harbor resonance. Heavy damage to seaweed farming was also observed, especially around the Futtsu Cape and the northern part of the Banzu tidal flat, which numerical analysis attributes to the appearance of large hydraulic resistance on seaweed net.

[1]  C. Scholz,et al.  The behavior of a convergent plate boundary: Crustal deformation in the South Kanto District, Japan , 1978 .

[2]  I. Aida.  Historical Tsunamis and their Numerical Models which Occurred in the North-Western Part of Sagami Bay , 1993 .

[3]  M. Ando.  SEISMO-TECTONICS OF THE 1923 KANTO EARTHQUAKE , 1974 .

[4]  Vipin Kumar,et al.  A Fast and High Quality Multilevel Scheme for Partitioning Irregular Graphs , 1998, SIAM J. Sci. Comput..

[5]  Changsheng Chen,et al.  An Unstructured Grid, Finite-Volume Coastal Ocean Model (FVCOM) System , 2006 .

[6]  Subhamoy Bhattacharya,et al.  Liquefaction of soil in the Tokyo Bay area from the 2011 Tohoku (Japan) earthquake , 2011 .

[7]  M. Hino,et al.  Response Characteristics of Tokyo Bay to Incident Long Waves , 1965 .

[8]  D. E. Smylie,et al.  The displacement fields of inclined faults , 1971, Bulletin of the Seismological Society of America.

[9]  Kazuo Nadaoka,et al.  Influence of Laver Aquaculture Facilities on Tidal Currents and Suspended Particulate Matter Transport at the Head of Ariake Bay , 2009 .

[10]  Geoffrey W. Cowles,et al.  Parallelization of the Fvcom Coastal Ocean Model , 2008, Int. J. High Perform. Comput. Appl..

[11]  Changsheng Chen,et al.  An Unstructured Grid, Finite-Volume, Three-Dimensional, Primitive Equations Ocean Model: Application to Coastal Ocean and Estuaries , 2003 .

[12]  Kenji Satake,et al.  Tsunami source of the 2011 off the Pacific coast of Tohoku Earthquake , 2011 .

[13]  D. Vatvani,et al.  Tsunami inundation and sediment transport in vicinity of coastal mangrove forest , 2007 .

[14]  J. Terwindt.  Prediction of earthquake damage in the Tokyo Bay area — A literature survey — , 1983 .

[15]  Nobuhito Mori,et al.  Nationwide Post Event Survey and Analysis of the 2011 Tohoku Earthquake Tsunami , 2012 .

[16]  T. Yasuda,et al.  Experimental Study of Tsunami Inundation in Coastal Urban Area , 2004 .

[17]  A. Apotsos,et al.  34. MODELING TIME-VARYING TSUNAMI SEDIMENT DEPOSITION , 2009 .

[18]  Ian Parsons,et al.  Surface deformation due to shear and tensile faults in a half-space , 1986 .

[19]  J. Sasaki,et al.  Modeling of Mud Accumulation and Bed Characteristics in Tokyo Bay , 2008 .