The 2011 Japan tsunami current velocity measurements from survivor videos at Kesennuma Bay using LiDAR

[1] On March 11, 2011, a magnitude Mw 9.0 earthquake occurred off the coast of Japan's Tohoku region causing catastrophic damage and loss of life. The tsunami flow velocity analysis focused on two survivor videos recorded from building rooftops at Kesennuma Bay along Japan's Sanriku coast. A terrestrial laser scanner was deployed at the locations of the tsunami eyewitness video recordings. The tsunami current velocities through the Kesennuma Bay are determined in a four step process. The LiDAR point clouds are used to calibrate the camera fields of view in real world coordinates. The motion of the camera during recordings was determined. The video images were rectified with direct linear transformation. Finally a cross-correlation based particle image velocimetry analysis was applied to the rectified video images to determine instantaneous tsunami flow velocity fields. The measured maximum tsunami height of 9 m in the Kesennuma Bay narrows were followed by maximum tsunami outflow currents of 11 m/s less than 10 minutes later.

[1]  Nobuhito Mori,et al.  Survey of 2011 Tohoku earthquake tsunami inundation and run‐up , 2011 .

[2]  Willi H. Hager,et al.  Landslide generated impulse waves. , 2003 .

[3]  F. Rivera,et al.  The Integration of TLS and Continuous GPS to Study Landslide Deformation: A Case Study in Puerto Rico , 2010 .

[4]  Hermann M. Fritz,et al.  Field Survey of the 27 February 2010 Chile Tsunami , 2011 .

[5]  D. J. Strom,et al.  Elevated radioxenon detected remotely following the Fukushima nuclear accident. , 2011, Journal of environmental radioactivity.

[6]  Harry Yeh,et al.  Propagation and amplification of tsunamis at coastal boundaries , 1994, Nature.

[7]  Willi H. Hager,et al.  Hydraulics of Embankment Weirs , 1998 .

[8]  Hermann M. Fritz,et al.  Lituya Bay Landslide Impact Generated Mega-Tsunami 50th Anniversary , 2009 .

[9]  Markus Raffel,et al.  Particle Image Velocimetry: A Practical Guide , 2002 .

[10]  K. Holland,et al.  Quantification of swash flows using video-based particle image velocimetry , 2001 .

[11]  Yuichiro Tanioka,et al.  Fault parameters of the 1896 Sanriku Tsunami Earthquake estimated from Tsunami Numerical Modeling , 1996 .

[12]  Nathaniel G. Plant,et al.  Practical use of video imagery in nearshore oceanographic field studies , 1997 .

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

[14]  F. Imamura,et al.  The 869 Jogan tsunami deposit and recurrence interval of large-scale tsunami on the Pacific coast of northeast Japan , 2001 .

[15]  Costas E. Synolakis,et al.  1992–2002: Perspective on a Decade of Post-Tsunami Surveys , 2005 .

[16]  Sarah E. Minson,et al.  The 2011 Magnitude 9.0 Tohoku-Oki Earthquake: Mosaicking the Megathrust from Seconds to Centuries , 2011, Science.

[17]  Hermann M. Fritz,et al.  2004 Indian Ocean tsunami flow velocity measurements from survivor videos , 2006 .