The Japan Meteorological Agency (JMA) announced yesterday that it has created web pages on earthquake early warning system in English.
I think it’s very important for you to read “Earthquake Early Warning Starting 1 October 2007(pdf)“ if you haven’t heard about this new warning system. The new system may only give you only three seconds for example, but those three seconds may save your life!
From JMA website:
The Japan Meteorological Agency (JMA) is providing residents in Japan with Earthquake Early Warnings, new prompt earthquake alerts to be issued immediately after the occurrence of earthquakes, in order to secure time to protect yourself before strong tremors arrive.
Earthquake Early Warning will be provided through several means such as TV and radio from 1 October 2007.
Or please visit their “Earthquake Early Warning” page.