Page 157 - Faults News Today

Hard rock. these are faults that are breaking through hard rock, that is why they create these waves. there we go. we are now getting some of our graphics. >> the blue means it happened more than an hour ago but less than 24 hours ago. you can see some yellow underneath because we are more than 24 hours since the main shock but all those blue dots are the aftershocks of the last 24 hours, and the red ones are within the last hour, so the main shock has already turned blue and that is right there...

In there, moved to fault farther, then we have the 7, then look at that cluster to the northwest. right now, we arent 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 afters...

Happened on the san andreas. is that because it is eventually going to take over from the san andreas? millions of years. now on our timescale. but still, we sometimes call this a complex plate boundary. two-thirds of the motion happened on the san andreas. the rest of it gets smeared out through other faults. this is the 10% to 20% that is smeared out. >> reporter: this is los angeles, do you see these kinds of events in the utah? >> yeah, the farther east you go the less frequent they are but ...

Horizontal direction than going down. >> the depth of this is similar to what youve seen before historically in this region. >> yes, in this region, weve had somewhat deeper faults. the area is that idea of redirecting the san andreas, we are seeing this area opening up. it is what the geologists call the basin and range system. you have the big fault thats on the side of the sierra nevada and then we have the faults forming all of the different ranges that go out through nevada all the way out ...

>> theres actually a number of questions in terms of the ground motion that are radiated from faults. as they break to the surface. theres indications that the ground motions are lower. than they might be expected from ruptures that are buried. talking about the north ridge earthquake. there was a buried fault. it was very energetic. the magnitude was 6.7. it was incredibly strong shaking. this earthquake its going to be interesting to see. its a 7.1. the ground shaking in the preliminary indica...

300 years. and so we have a lot to learn about where earthquakes happen. we know there are a lot of faults that we havent experienced earthquakes on. they havent happened during our historical era. but that doesnt mean that they cant happen soon. for example, in cascadia, we know the last earthquake was in 1700, and there will be another soon of a similar size, a magnitude nine. and weve experienced the earthquake in 1857 and the 1906 earthquake, so we know the san andreas fault can produce big ...

Of after shocks and have a hunch where it is coming from. until we get eyes on it thats when we can confirm. today we were out looking on a previously mapped fault. we did find fault surface rupture out at the base on highway 178 where you had seen images from last night and also that rupture continues from that point on highway 178 it also continues to the northeast and southwe southwest. this is a somewhat a typical type of earthquake in southern california. weve seen this before though these ...

The fault here. we also heard from seismologists that there are two faults that potentially ruptured, causing the -- potentially causing more damage. there are a lot of smaller aftershocks that have already been happening. people need to be prepared, take stuff off the wall, have water, have food in your home. we dont know how big these are going to get. victor? >> sara sidner, excellent advice. thank you so much. last nights quake was so powerful people felt it as far away as las vegas. our n...

Faults. so whats typical is to have your bigger earthquakes on the faults that are oriented like the san andreas fault moving right laterally. whats left typical a cross fault structure thats lateral. so 6.4 occurred that rupture was on cross fault as well as portion of the main fault and now the 7.1 is on the main fault. we seen that main shock as just northwest of that intersection so know represent your went towards the northwest and also to the southeast. we have confirmed fault surface rupt...

It is still very its hard rock. these are faults that are breaking through hard rock. they create the waves that we feel strongly. we have been down here in los angeles. >> so the blue heens it happened more than an hour ago. less than 24 hours ago. you can see the yellow underneath. were more than 24 hours since the main shock. all the blue dots are the after shocks over 24 hours. and thats the red are within the last hour. the main shock is already turned blue. thats right there. the epicenter...