The ground motion of an earthquake wave generated by a 5.0 magnitude earthquake is times greater than the ground motion of a 4.0 magnitude earthquake wave.

10

Explanation:

From Columbia University "For example, a magnitude 5 earthquake produces ten times greater ground motion than a magnitude 4 earthquake."

Each increase in magnitude on the richter scale should represent a 10x greater ground motion, meaning that an increase from 4 to 6 would be 100x more

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the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.