What is the definition of physical trade barrier?

any regulation or policy that restricts international trade, especially tariffs, quotas, etc.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.

answer; they are called (pebbling);