alleryAn earthquake with focal depth under 70 km is classed as what?
AShallow-focus quake
BIntermediate-focus quake
CDeep-focus quake
DSurface-focus quake
Answer & Solution
Correct answer: A. Shallow-focus quake
1. Earthquakes shallower than 70 km are shallow-focus.
2. Those between 70 and 300 km are intermediate-focus.
3. Deep-focus ones reach 300 to 700 km.
_Source: Wikipedia, Earthquake, Focus_
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