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Once the earthquake that triggered the tsunami occurred, authorities knew that a tsunamis was likely. Prior to the earthquake there was no way of predicting it.
It is most likely to have just been caused randomly by the three plates that board Japan or the rather small Chinese earthquake a day prior to the Japanese Earthquake and Tsunami.
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Prior to the magnitude 9.0 earthquake in March 2011, the previous record for the largest magnitude was 8.5 on June 15, 1896 in Sanriku, Japan. The largest number of deaths attributed to an earthquake in Japan was the magnitude 7.9 quake on 1923/09/01 in Kanto (Kwanto), Japan with 142,800 deaths. Mass destruction due its closeness to Tokyo in addition to a resulting tsunami.
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Isolated from the world
The earthquake that hit prior
Apparently the bubbles or frothing are formed by a change of chemicals in the water. I've read that prior to a tsunami, the sea water might make our skin itch too. The example I read stated that it's much like the effect of carbonated water....the gas or gases having come from a possible at-sea earthquake or an at-sea volcano (underwater, obviously!).
Before the age of feudalism the leader of Japan was called the emperor. Prior to emperors, Japan had what were referred to as Shoguns.
Isolated from the world
Isolated from the world
Japan had fought a war with Russia and had invaded Manchuria prior to the start of World War II.