Been a lot of concern up in california on this swarms, these dreamtors that have been taking place, and in many cases around the world, we re on the ring of fire, that can t happened. so let s back up and review. a 6.4 at 10:33. at that s the foreshock. if we see a quake develop stronger, that will being the original quake. but we re seeing which means the wave activity was able to travel farce, because it wasn t so deep into the earth. this is a shake map. very strong shaking, 42,000, that s ridgecrest.
Since 5 after 10:00 there have been three smaller after shocks. now, that s typical. if we have something that shakes a little bit shocker that s a 6.4 that ll be considered tquak. in the last few weeks there s been a lot of interest in kind of swarm of smaller tremors that have been happening in california, and it s kind of sparked the interest on many seismologis seismologists wondering, hey, is something going to happen? are we going to see a larger release of energy? is this it, the 6.4? the usgs will provide us with a couple of graphs and show us a shake map, how many moderate, strong, very strong or violent.
The 4.1 or 7. that s the fore shock, but it s only 5 miles in-depth. that s considered extremely shallow. that means more energy can be dispersed. she talked about high frequency. that s more violent shaking and then low frequency those are the wave actions you feel and its outwards further. she talked about how it traveled about 10 miles on the fault line. that s because this was called a strike slip. that means the two parcels of land kept horizontal not like a thrust where one is pushed on below the other. the shake map came out, and i know this is difficult to see so i m going to read these colors off. ridgecrest in the middle and yellow, green, blue and you come out to fresno, long beach and
85 aftershocks, and now we ve got over 150. what s the threshold? typically it s 2.5 or higher. they may be counting 2.0s. it tells us there is still a lot of energy trying to be released. let s talk about this, 6.4 and only five miles in depth. that s extremely shallow. covering these around the world almost every month, most of these this size are hundreds of miles deep into the surface. it happened at 10:33, but at 10:05 there was a 4.0. that s the 4 shock. this is the earthquake. now, this is the strongest quake in southern california since 1999 in the town of ludlow, california. that was a 7.1. but if you get in and around the ridgecrest area, the last time you had one within 30 miles was in 1995, and that was a 5.8. so this is stronger. here s the shake map. it s hard to see these colors, so i ll break it down for you. ridgecrest is right here. very strong shaking, 42,000. that s the town. ridgecrest saw just over 30,000,
Shake map or the population that felt either light, moderate or stronger damage. but, first, you usually have one earthquake that s 8.1 or higher. almost 15.5 million people felt shaking, 1.6 million very strong. the usgs has the computer models. there s a 40% chance, and unfortunately we re starting to see that, don. we are looking at after shocks. not many have occurred. not many have been recorded right now, but they will. this is going to take days, weeks or even months. any structures that have been compromised are going to fall, so unfortunately a lot of people are sleeping in the streets tonight. hurricanes and earthquakes, you re right. i want to bring in mike ties.