How do I make him less afraid?

hi; i really feel for you and your son,hun the only thing that i can think of after praying about this is move to another location.that kind of exstreem fear is unhealthy,or if he doesn't know the Lord Jesus Christ as his personal Saviour them introduce him to your son and pray with him til God fills his precious heart with his unfailing love and peace.you see God peace will keep your hearts and minds through his son Jesus if you will keep your minds stayed upon him.also you might think about where he might have heard the more dramadic things about earthquakes,that making him so afraid and put a stop to it....take care and my God's peace go with you.