Which of the following sites experienced the deepest earthquake?

Site C3: Magnitude 6; focus = 50 km; epicenter = 30 miles from seismometer; fault dip = 30 degrees

Site P0: Magnitude 4; focus = 20 km; epicenter = 10 miles from seismometer; fault dip = 70 degrees

Site R2: Magnitude 2; focus = 100 km; epicenter = 20 miles from seismometer; fault dip = 50 degrees

Site D2: Magnitude 1; focus = 70 km; epicenter = 50 miles from seismometer; fault dip = 20 degrees

Question

Which of the following sites experienced the deepest earthquake?

Site C3: Magnitude 6; focus = 50 km; epicenter = 30 miles from seismometer; fault dip = 30 degrees

Site P0: Magnitude 4; focus = 20 km; epicenter = 10 miles from seismometer; fault dip = 70 degrees

Site R2: Magnitude 2; focus = 100 km; epicenter = 20 miles from seismometer; fault dip = 50 degrees

Site D2: Magnitude 1; focus = 70 km; epicenter = 50 miles from seismometer; fault dip = 20 degrees

BlackTom AI · Accepted Answer

To evaluate which site experienced the deepest earthquake, we should focus on the focus depth values provided for each site, since depth is measured by how far below the surface the earthquake originated.
Option D2: Focus = 70 km. This is relatively shallow compared to some others and not the deepest.
Option C3: Focus = 50 km. While deeper than some levels, it is shallower than several options listed, so it does not represent the maximum depth here.
Option P0: Focus = 20 km. This is quite shallow, far from the deepest option among the choices.
Option R2: Focus = 100 km. This is the greatest depth among all the sites, indicating the earthquake originated deepest at this location.
Additionally, although other factors like magnitude or fault dip are provided, the question specifically asks about depth, so focus depth is the decisive metric. The depths decrease in order from R2 (100 km) to D2 (70 km) to C3 (50 km) to P0 (20 km), so the deepest event corresponds to the highest focus value.
In summary, the key criterion here is focus depth, and Site R2 has the largest depth value, 100 km, making it the deepest occurrence among the options.

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