Hi All. Where have we heard this before? It seem the most recent quake to strike Japan occurred on an unknown fault. Take Care…Don in creepy town

A surprisingly strong series of aftershocks, rivaling the main quake in magnitude, has continued to shake the area. And all this is happening in a region where scientists didn't even know there was an active fault.

Right now, scientists have only a rudimentary picture of the new fault zone - a rectangle roughly 15 kilometers deep and 30 kilometers across.

The strong aftershocks imply that the crust below may have snapped off and then redistributed stress among many different faults. "This could be a very complicated fault system," says Hirata.

• New Fault