to spread over an area in a sentence

1. The shots seemed to spread over an area of several blocks, and people would run one way, then another, skittering like birds.
2. The shots seemed to spread over an area of several blocks, and people would run one way, then another, skittering like flights of birds.
3. One other important difference is that the shaking of earthquakes tends to spread over an area 4 to 10 times greater in eastern earthquakes than on the West Coast.
4. It's difficult to find to spread over an area in a sentence.