information out. and in fact one of the exciting things, these biggest earthquakes they aren t at a point. so when we re trying to predict where will be affected we need to know which direction the fault is going. we have a prototype system and that worked here, too, so we got an estimate of the fault growing as it was happening. so it s the first time we ve ever really had that work. can we talk a little bit about the motion? to me it sort of felt like i was aen on a boat and i felt a little nauseous. i ve heard other people say the same. so an earthquake produces energy at many different wavelength. there s high frequency energy that jerks you around and low frequency that rolls. the high frequency energy dies off with distance more quickly than the low frequency energy. think about a boom box. you hear the car going down the street, when it s a long ways away all you hear is the drum beat. that s the high frequency energy getting away from the low