The tsunami by the 2011 Tohoku Pacific Ocean Earthquake attacked northern-east coasts of Japan. The main purpose of this paper is to record distribution of inundation heights and run-up heights for improving disaster preventions along north part of Ibaraki prefecture coast, where no accurate records of big tsunami had kept. Water-trace marks and levels shown by witnesses were searched and those heights were measured. There are varieties of results of inundation heights and run up heights along coasts, which means that the tsunami traveled along coast complexly. Though those heights were comparatively good agreements with the information in hazard map provided by local government, the results of inundation area inform that a method to calculate run up of tsunami on land should be modified.
