According to the data of deepwater DONET observatories, the relationship between the bottom pressure variations and the acceleration of the bottom fluctuations during the Tohoku 2011 earthquake was investigated. The method of cross-spectral analysis confirmed the existence of a linear relationship between the pressure variations and the vertical acceleration component in the <<forced oscillation>> frequency range. The connection is manifested as a close to unity value of the square of the coherence at practically zero phase shift. It is shown that the slight deviations from this rule observed for some stations are related to the contribution to variation in the pressure of the horizontal oscillations of nearby underwater slopes.
$^1$Department of General Nuclear Physics, Faculty of physics, Lomonosov Moscow State University, chair of Physics of Sea and Inland Water.\
$^2$Japan Agency for Marine-Earth Science and Technology (JAMSTEC)\
$^3$Institute of Education, Research and Regional Cooperation for Crisis Management, Shikoku
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