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Report No.
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Displacement of buildings and standard points in MLF caused by the 2011 off the Pacific coast of Tohoku Earthquake

Harada, Masahide; Iwahashi, Takaaki; Harjo, S.; Strasser, P.*

The 2011 off the Pacific coast of Tohoku Earthquake occurred on March 11 in 2011 seriously damaged all J-PARC facilities. In order to restart the beam operation, the alignment work is one of the most important issues. In order to make a plan to re-alignment of devices in MLF, fluctuations of the MLF building and standard points in MLF have been measured with level measurements and traverse measurements. As the results of the level measurements, uneven sinkage of 9 mm in the maximum was found in the MLF building. Large sinkage of about 90 mm and 140 mm was found at two attached buildings. From the measurement after 1.5 month, a sinkage of 1.7 mm in the maximum was found. As the results of the traverse measurements, no large fluctuation in the MLF building was found. However, the attached building was moved away with about 30 mm.

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