A 20cm tsunami was observed in Japan's northerly regions of Hokkaido and Aomori Prefecture. There are no reports of casualties or significant damage. Events like these are not uncommon in Japan, a country known for its seismic activity. Authorities have reminded residents about the importance of remaining vigilant and adhering to proper safety protocols.

In Japan, the threat of tsunamis is a constant reality due to the nation's seismic activity. Its citizens are well-prepared, with regular disaster drills and robust warning systems in place. There is a strong social value placed on being prepared for, and knowledgeable about, potential natural disasters.

In the US or EU, where seismic activity is less common, tsunamis of this size are rare. While there are protocols in place for extreme weather events and other natural disasters, there may not be the same level of public awareness or infrastructure to deal with tsunamis specifically.