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>> what happened in japan was a subduction zone earthquake which created a magnitude 8.9 event which propagated a lot of energy into the shore there. creating a tsunami that you've seen all sorts of information an videos on and provides a lot of damage onshore. >> is there any way, it's like asking what caused this weather. what causes an earthquake? what is the most basic -- give me a basic primer on that. >> basically what you see happening here is that there's a subduction zone. we've got two plates moving together. one under the pacific ocean, diving underneath japan, sliding down undernea...

Down underneath japan. it has to break every once in a while and that is a very large event which occurs on several hundred year recurrence intervals, but this is something that's not unexpected to happen in the long term. >> i've got relatives that live out -- my wife's from san francisco and i have another relative, she's always afraid she'll be there for one of these things. do we know about the potential of something like this happening in california? >> the san andreas fault is not large enough to sustain a magnitude 8.9 earthquake. it can go up to about 8.0. the place that has this kind ...

>> what happened in japan was a sub duction zone earthquake which created a magnitude 8.9 event which propagated a lot of energy into the shore there. creating a tsunami that you've seen all sorts of information an videos on and provides a lot of damage onshore. >> is there any way, it's like asking what caused this weather. what causes an earthquake? what is the most basic -- give me a basic primer on that. >> basically what you see happening here is that there's a subduction zone. we've got two plates moving together. one under the pacific ocean, it's sliding down underneath japan. it has to...

Seen all sorts of information an videos on and provides a lot of damage onshore. >> is there any way, it's like asking what caused this weather. what causes an earthquake? what is the most basic -- give me a basic primer on that. >> basically what you see happening here is that there's a sub duction zone. we've got two plates moving together. one under the pacific ocean, it's sliding down underneath japan. it has to break every once in a while and that is a very large event which occurs on several hundred year recurrence intervals, but not unexpected to happen in the long-term. >> i've got rel...