California Supplemental (CSE) Practice Exam

What setback is generally required for structures built over an active fault zone?

1. 25 feet

2. 50 feet

3. 75 feet

4. 100 feet

The correct answer is: 50 feet

The correct answer is the specified setback of 50 feet for structures built over an active fault zone. This requirement is established to minimize the risk to life and property from potential ground rupture and seismic activity associated with fault movement. The 50-foot distance helps ensure that buildings are positioned far enough away from the fault line to reduce the chance of structural damage that could occur from seismic events. This setback measurement is based on studies and guidelines established by various geological and civil engineering authorities that monitor fault zones. The objective is to enhance safety and mitigate hazards related to earthquakes, which are a significant concern in areas of California known for their geological activity. While larger setbacks, such as 75 or 100 feet, may provide additional safety, the standard requirement for many jurisdictions is 50 feet, balancing safety with practical considerations regarding land use. The other options do not reflect the commonly accepted regulatory framework for such construction near active fault lines.