Last week a 5.7 magnitude earthquake struck off the shores of Japan, and produced a small tsunami wave. Today (May 10 2015), another 5.7 magnitude earthquake has struck off the shores of Japan, this time accompanied by a noteworthy (large) swarm of earthquakes to follow the event. 

It is troubling to see any noteworthy earthquake swarms along this particular trench / ridge, due to the location of the 9.0M mega-earthquake from 2011 being due North of this new swarm spot. This movement along the Izu trench is indicative of the pressure showing in the area. The greater pressure is causing the long silent (800 years dormant) Hakone volcano to show signs of eruption. MORE