6.2 producing energy, and the warning came through. do we have a time of how much warning we got in pasadena? and the final magnitude, of course okay, so in los angeles there were a 48-second warning that was the shaking was arriving. obviously it was not damaging shaking. that s one of the down sides to this only approach we have. the farther away you are the more warning you get and the less likely there is to be damage. and there are censors in satellites? how do we ever know there s an earthquake? we have censors called seismometers distributed around california. we ve recorded about 500 censors seismic network and they are distributed widely so we can try and catch them. as soon as we get enough nearby we can see that an earthquake is under way and we send that
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
on the phone from ridge crest. in the meantime i have maurice wadd on the phone with me. you are in los angeles and i appreciate you calling in. you re from ohio. have you ever felt anything like this and what did it feel like? quite the wakeup call is what it felt like. yeah, coming from ohio this was an experience to say the least. hang on one second. let s listen to this. this is seismologist speaking about the quake. the duration is how long the earth is producing energy, and earthquakes begin at an epicenter and happen along a fault, and they start at the epicenter and rupture down the fault. that rupture feed is 2 miles a second. if the fault is 10 miles long the earthquake is producing energy for 5 seconds. this earthquake at this magnitude likely that the fault is at least 10 miles long
unless there s injuries and an emergency please do not call us. there s ways to get information online. but when those phone lines get jammed and there is an naerjs, there are fires, for example, people injured, there are damages people are concerned about, they cannot get the help they need as soon as they need it. so that s one warning to folks who are obviously concerned with what has happened. and the fact this went on so long, brooke, is significant because the longer the earthquake goes on, the more potential for more damage. and you heard there, there are people now two people have confirmed they have seen fires in the ridge crest area. brooke? thank you so much for all of that. i can tell you ve been through this before. great note on not calling 911 unless you have a serious injury. live pictures here as they ve certainly got eyes on the skies, and note worthy now the reports of these fires in the ridge crest area which is closer to where this thing was centered. so hopefull
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