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Earthquake foci (Focus, singular) are....
1) More than 200 miles
2) 0-50 miles deep
3) Deep 50-200 miles deeo
4) All the above

Verified Answer :

maddzzzz

the answer is the 3rd choice

Answer:

3. depth of 50 - 200 miles.

Explanation:

  • The foci is the focus spot down below the epicenter where the earthquake occurs in the crust and upper mantle. The presence of a subduction zone where the plate collides with one another.
  • The earthquake range from 0-800 mile of depth the deep foci earthquakes are of range 50 to 300 miles as the stress regimes are deeper downwards like a dip down.
  • This zone is also called as the dipping seismic or the wadis Benioff zone. As the san Andreas fault has a shallow depth of about 20 m depth which is considered the deepest.

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