Today, at 10:15, everyone in Missouri is asked to take about 60 seconds to Drop, Cover and Hold On. . It’s the 200th anniversary of the largest earthquake in state history, so to stress the importance of earthquake preparedness, it’s Great Central U-S Shake Out Day. Schools, hospitals, businesses, everyone is encouraged to take part in the earthquake drill. Drop to the ground, take cover under a sturdy table or desk and hold on until the shaking stops.