Earthquakes in Japan have always been very frequent, but they are a major concern since the accident at Fukushima. The pool above reactor 4 indeed contains more than 1000 tons of radioactive fuel, enough to polute half of the globe. This pool is supported by an instable structure damaged by the accident of March 2011 and that might collapse if hit by a relatively strong earthquake. If such accident happens, the radioactivity will prevent the workers to approach the nuclear plant and the whole facility will thus be abandoned, leaking radioactivity for thousands of years...
I've decided to develop this extension to get alerted of earthquakes quickly, directly in the browser. As a default configuration, I defined concentric areas around the plant at Fukushima Daishi with growing magnitudes for the largest areas. Thus, you get alerted of any significant earthquakes around the plant, within minutes. But this extension can also be used to be alerted from earthquakes anywhere in the world.
The extension collects data from http://earthquake.usgs.gov/
. The first website notifies from earthquakes anywhere in the world, the second is the most accurate and fastest way to get alerted of earthquakes in Japan.
Once installed, you can define the areas on which you want to be alerted of earthquakes. Just draw them on an integrated google map and define the minimum magnitude above which you want to be alerted! Then, a menu accessible from the "Add-on" bar, lists the recent earthquakes matching the conditions defined by the areas and associated magnitudes. You can click each quake to get further information.