Question

Which of the following factors does not affect strong ground motion?

• A. Wave types
• B. Site conditions
• C. Distance from epicenter
• D. Type of structure

Hint:

Ground motion is purely a geophysical phenomenon; building type affects damage, not the motion itself.

Answer 1

The Correct Option is D

Step 1: Analyzing Ground Motion Causes.
Ground motion is determined by seismic wave characteristics, the underlying geology at the site, and the distance from the seismic source (epicenter).

Step 2: Evaluating Influencing Factors.
- Seismic Wave Types: Various seismic waves (P, S, surface waves) generate distinct levels of ground shaking.
- Site Geology: Local soil and rock formations significantly amplify or attenuate shaking intensity.
- Epicentral Distance: Proximity to the epicenter correlates with increased ground motion intensity.
- Structural Type: This factor influences a structure's *reaction* to ground motion, not the motion itself.

Step 3: Determination.
The type of structure does not alter the characteristics of the ground motion.