Explain why some regions with high tectonic hazard do not experience frequent large earthquakes and how this affects hazard perception.

• A. All high hazard regions have frequent earthquakes.
• B. Tectonic hazard guarantees frequent quakes.
• C. Hazard perception is not influenced by recurrence.
• D. Intra-plate or infrequent megaquakes occur; hazard may be latent; long recurrence intervals can lead to complacency or under-preparedness.

Answer: (D)

High tectonic hazard does not automatically mean earthquakes happen often. The frequency of large earthquakes depends on how quickly stress builds up and is released on faults, which can vary a lot. In some regions, especially intraplate areas or places capable of megaquakes, stress accumulates for long periods and is released only rarely in a very large event. So the hazard is still high—there is potential for a big quake—but the actual large earthquakes may occur at long recurrence intervals, with long quiet spells in between.

This gap between hazard and observed frequency shapes how people perceive risk. If there hasn’t been a big quake for many generations, the danger can feel latent or forgotten, leading to complacency or under-preparedness even though the region remains capable of a damaging event. Hazard assessments must account for these long recurrence intervals and the possibility of a sudden, large event, not just the pattern seen in recent history.