Global Distribution of Earthquakes 1. The earthquakes along the western margin of South America get deeper inland from the Pacific. What tectonic process is causing focal depths to occur in this patte

Global Distribution of Earthquakes

1. The earthquakes along the western margin of South America get deeper inland from the Pacific. What tectonic process is causing focal depths to occur in this pattern?

2. Earthquakes in the middle of the Atlantic Ocean occur at shallow depths. With what geologic feature are these earthquakes associated?

3. Are most of the earthquakes that occur along the western margin of North America shallow or deep focus? 

4. How is the western margin of North America tectonically different from the western margin of South America?