The probability of a magnitude 6.7 or greater earthquake in the Greater Bay Area during the next 30 years is 63 percent, or about two out of three. Lawrence Livermore National Lab scientist Sean Ford and teacher Ken Wedel discuss what an earthquake of that size in the Bay Area would look like and explain its effects. Just like an earthquake, a nuclear test can cause seismic disturbances that are recorded at monitoring stations around the world. Learn how seismologists tell the difference between these two sources by sleuthing seismic signals. Series: "Lawrence Livermore National Lab Science on Saturday" [Science] [Show ID: 24772]