Still high number of aftershocks in Japan earthquake

As of 17:00 GMT today there have been 230 aftershocks of magnitude 5+ after Friday's magnitude 9.0 earthquake.

While everybody seem to be focused on the effects of Friday's quake and tsunami, particularly the Fukushima powerplant, I'm more concerned about another event that happend this afternoon.

The yellow arrow points to a magnitude 6.2 quake. The reason that I'm focusing on this is that it is not part of the same fault as Friday's events. This quake is situated near the famous Mt. Fuji volcano just at the 3 plate intersection of the Okhotsk plate, the Philippino Sea plate and the Eurasian plate. 

This area has for a long time been considered the most dangerous area for a new 8+ magnitude earthquake with a possible eruption of Mt. Fuji. Such a scenario may have devastating effects on the world's most populous metropolitan area.

The image below shows the episenter position in Google Earth overlayed by a colored shakemap showing the intensity of the quake.The lines show the bounderies of the three plates.

Today's event may be a foreshock of the major event (Tokai earthquake) Japan has been fearing and preparing for ever since the 1923 Great Kantō earthquake which put Tokyo in ruins.