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There. moved the fault further. we have the seven. look at the cluster to the northwest. we think right now we aren't getting many of the after shocks recording yet. the system is strung out. and so, pretty sure that is a continuous after shock zone. that is the extent of the fault. just the length of the fault a magnitude 7.1. we would expect it's probably at least about 25 miles long. that would imply probably the whole length from where the 6.4 happened to the after shocks are. >> china lake up there? >> yeah, so -- >> naval. >> the naval air station is that whole area. so this is all withi...

>> lucy, all on the same fault line as the 6.4. >> the same fault system. it appears to have multiple strands to it. we've already seen the two perpendicular ones. i think they got the magnitude wrong because yeah. unless it hasn't come through yet. boom. >> can you explain the shake alert again? because some people just got the initial report that it, quote unquote, wasn't working. >> okay. >> can you explain again that -- >> let's let the usgs handle that one. >> so yeah, so the system worked. >> that was a 5.1. >> yeah. >> so the system, the shake alert system worked both on usgs side and o...

In there, moved to fault farther, then we have the 7, then look at that cluster to the northwest. right now, we aren't getting many of our aftershocks recorded yet. this is pretty strong out. so, pretty sure that is a continuous aftershock zone and that would mean that is the extent of the fault. the length of the fault, magnitude 7.1, we would expect that it is probably at least about 25 miles long and that would imply probably that whole length from where the 6.4 happened up to where the aftershocks are on the corner. >> reporter: is that the leg up there where the red is? >> the naval air b...

Line at the 6.4? >> the same fault system. it has multiple strands to it. we have already seen the two. i think it got the magnitude wrong. yeah, unless it hasn't come through yet. >> can you explain the shake alert again? people just got the initial report. it quote on quote wasn't working. can you explain again that -- >> let's let the u.s. gs handle that. >> the system worked. >> that was a 5.1. >> the system the shake alert system worked on the u.s. gs side and the shake alert l.a. side. the reason why alerts didn't go out to l.a. county is that the threshold for shaking was set above what...

Between a 6.4 and the 7.1 is about a factor of eight. 7.1 to 7.8 is the same difference and it will be that much bigger. is 7.8 on the san andreas is going to be eight times bigger than this earthquake and of course a lot of it will be closer to us, but this is only 10 percent the size of the san andreas earthquake is a pretty big earthquake. i don't think we should underestimate just because we didn't get hit that badly, just how bad it is right now. >> easter sunday of 2010, there was april 4th, that earthquake at magnitude of seven-point to, i haven't been including that because it wasn't i...