Discussion
Arrange the following in the order in which they modify an earthquake motion on its way to a building.
1. Local soil column 2. Fault rupture at the source 3. Travel path through the crust
Answer: B
Correct answer: 2, 3, 1
The motion is created at the fault by the rupture, modified as it travels through the crust by geometric spreading and attenuation, and modified again by the soil column immediately beneath the site, which may amplify it strongly and shift its predominant period. Each stage is modelled separately in hazard analysis, and the site term is usually the largest single source of variability.
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