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What does a pattern of increasing earthquake depth in a subduction zone indicate?

Answer and explanation

Correct answer: Possible inclined sinking of one plate

Direct answer: Option A, the possible inclined sinking of one plate. In a subduction zone, one tectonic plate moves downward beneath another. Earthquakes occur at different depths along the descending slab. If earthquake foci become progressively deeper in one direction, the pattern can trace the sloping geometry of that sinking plate, commonly called a Wadati–Benioff zone. Step by step: the plate begins near the surface; it travels downward at an angle; earthquakes occur along or near the brittle part of the slab; their increasing depths reveal the inclined path. Option A is correct. Option B is wrong because earthquake depth patterns do not show seawater drying. Option C is wrong because subduction can occur together with crust creation at a mid-ocean ridge elsewhere; the pattern does not prove that ridge crust is absent. Option D is wrong because it has no logical connection with subduction and atmospheric pressure. Exam cue: progressively deeper earthquakes away from a trench suggest a dipping subducting plate.

Related tags

SubductionEarthquake-DepthPlate-Boundary

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