Next story, earthquakes.We told you yesterday about the strong one that shook part of Japan last weekend.In the northwest corner of Nevada there've been more than 50 tremors over the past week.Thousands in recent months. Now, they are relatively small and they are in a relatively remote part of the state. But seismologists are concerned over these earthquake swarms.I'm in Hayward, California, just east of San Francisco, and danger lurks right beneath my feet.There's a major fault right beneath this parking lot, and it's due to go.It could happen in the next ten years, it could happen next year. It could happen right now. You never know when earthquakes are going to occur.And that's part of the reason why many are alarmed over earthquake swarms.An earthquake swarm is a concentration of earthquakes in a short period of time.One area that has experienced this phenomenon, is in a remote desert that links Oregon, Nevada and California.There've also been swarms in other parts of the country that you wouldn't normally associate with earthquakes.Places like Kansas and Oklahoma, some have suggested that fracking is to blame, that's the method to extract oil and natural gas from the ground,but there's no universal agreement on that.They've certainly rattled some nerves and they question whether or not a bigger quake might be coming.Any time you are in area and you begin to have earthquakes, the thought is am I going to have something? And the reality is, we don't know.