TABLE 5.2 Steps for Hazard and Risk Assessment for a Single Project
|Step (see corresponding box in Figure 5.1)||A. Probability needed||B. Method||C. Technology Dependent?||D. Region Dependent?||E. Depth Dependent?|
|1||1A. P[generate M ≥ 2 earthquakes]||1B. Statistical||1C. Yes, depends on factors such as volume, pressure, rate, and depth||1D. Yes, tectonically active versus stable region||1E. Yes, large earthquakes usually not induced near surface|
|2||2A. P[shaking felt at surface]||2B. Analytical/ Statistical||2C. Yes, depends on magnitude distribution and maximum magnitude||2D. Yes, depends on earthquake properties||2E. Yes, deeper induced earthquakes may not be felt|
|3||3A. P[strength of shaking]||3B. Analytical||3C. Yes, depends on maximum magnitude||3D. Yes, depends on earthquake properties||3E. Yes, shallow earthquakes will generate stronger shaking|
|4||4A. P[structures and people affected]||4B. Analytical||4C. No||4D. Yes, depends on structural strength and tolerance for shaking||4E. Yes, deeper earthquakes, if felt at the surface, may affect a larger area|
NOTE: Gray shaded cells indicate methods that have to be developed to estimate probabilities (“P”) for various aspects of an induced seismic event shown in the green-shaded cells. These four aspects include the probability of generating an earthquake of M > 2.0, the probability of shaking being felt at the surface, the probability of different strengths of shaking from an earthquake, and the probability that the earthquake shaking will affect structures and people.