So far so good
The earthquake was a relatively strong one and a limited number of people suffered injures in the Tohoku region, but no real damage has been reported.
The seismic activity has increased recently in eastern Japan, including Tokyo, so please make sure that you are prepared for a major quake striking anytime soon. Most buildings in Tokyo are safe. If you are in a building that was built within the last 30 years years you should be ok. Many older buildings have also been improved since then. Ask the owner, or if you are in a hotel, the reception.
Charge your mobile phones, stock on water and dry food. Follow instructions from local and central authorities and stay calm. The best way to cope with disasters is to be as prepared as you can be while keeping your cool. And if you are in Tokyo and something happens you are more than welcome to come to the Embassy compund. We are there to assist you.