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we are seismologist measuring the movement of the ground. damage reports go to the office of government services. rob, can i ask you to come join us? so rob graves is a seismologist with the us geological survey and regional coordinator for southern california. and let me just obviously we re here because we had an earthquake to celebrate fourth of july. we re going to have people out, our geologists are heading out into the field right now to see if they can document any fault displacement obviously if any damage reports will come in. this earthquake was large enough where the shaking could have caused damage. one thing i d like to note is that here in the l.a. basin area because as lucy was explaining the waves, the low frequency waves tend to travel further than the high frequency. many people out in the l.a. basin would have felt that rolling shaking whereas up here in the mountains people didn t feel it as strongly.
probably a right amount which means the earth produces energy for 5 seconds compared to the fore shock would have been producing energy for a quarter of a second. i did not have shake alert working on the computers at home. the computers here in the lab did give an early warning for this by about, it would be a pretty long time because it s a long ways away. rob, why don t you come join us? the head yeah, he s getting briefed and then we ll get the usgs representative here as well. we see right here is our shaking distributions. we have a system that recognizes that earthquakes are beginning and sends you the information that the earthquake has begun and an estimate of when shaking will get you depending on this travel time of the waves. so the system worked and said there s an earthquake of about