Intro >> BREAKING NEWS NOW AT 4 SOUTHERN CALIFORNIA SHAKES IN A MAGNITUDE 4.9 EARTHQUAKE. GOOD AFTERNOON. THIS IS THE KTLA 5 NEWS AT 4 I'M HI SAM AND Earthquake LAUREN AS YOU BOTH SAID PRELIMINARY REPORTS WERE COMING OUT RIGHT WHEN IT HAPPENED, I KNOW X WAS ABUZZ WITH A LOT OF PEOPLE. >> SAYING WHERE THEY FELT IT AND A PROFESSOR WHO WE'RE GOING TO BE SPEAKING TO IN JUST A SECOND SAYS THAT HE FELT IT HERE IN RIVERSIDE SO WAS PRETTY WIDESPREAD BUT TAKE A LOOK AT THIS MAP THAT WE'VE CREATED FOR YOU TO KIND OF GIVE YOU AN IDEA OF THE EPICENTER OF THIS QUAKE THAT HAPPENED EARLIER TODAY THE U.S. GEOLOGICAL SURVEY. SAYS THAT IT HAPPENED AT AROUND 01:00PM ROUGHLY 13 MILES NORTH EAST OF BARSTOW IN SAN BERNARDINO COUNTY IT WAS FIRST REPORTED AS A 5.1 MAGNITUDE BUT QUICKLY DOWNGRADED FROM THAT. SCIENTISTS SAY THAT THEY LOOKED AT EARTHQUAKES WITH A MAGNITUDE 4 OR GREATER WITHIN Historic Earthquakes ABOUT A SIX-MILE DIFFERENCE FROM WHERE THIS HAPPENED, HERE'S WHAT THEY FOUND. >> HISTORICALLY WE'VE HAD 22 SUCH EVENTS SO SINCE 1932. THE LARGEST HISTORIC EVENT WE HAVE IN OUR CATALOG WAS A MAGNITUDE 5.3 IN 1997. >> ALL RIGHT AGAIN A 4.9 MAGNITUDE EARTHQUAKE AND WE'RE HEARING FROM EXPERTS THAT THIS I HAPPENED POSSIBLY ON THE CALICO FAULT