Fault hazard analysis
The fault hazard analysis works just like the main Hazard Assessment app except the grid sources are limited to just the fault locations.
Grid Sources and Parameters
A grid point is assigned to a fault if its cubic cell volume intersects with any of the fault polygons. For the purpose of viewing the source details on the fault, the nearest grid point is assigned to each fault vertex. You can plot the following source details as a grid or on the fault surfaces:
- b-value. Magnitude distribution parameter.
- N-value. Event rate parameter.
- Source hazard. The probability of exceeding the design magnitude (annualised, within the grid cell volume).
Minode Hazard Assessment
Once the grid sources are calculated, the ground motions are then assessed for each minode based on each fault source. You can plot the ground motion hazard on minodes based on:
- all sources,
- all fault sources,
- a chosen fault source.
There are also options to plot on minodes the:
- relative contribution of fault sources compared with all sources,
- relative contribution of a chosen fault compared with all sources,
- the fault with the highest hazard at each location.
Hazard Results and Visualisation
The probabilities for each fault grid point and each minode are accumulated to show the combined source hazard and excavation hazard associated to each fault. These can be viewed in the 3D window or in the fault summary table. There are also relative hazard values for each fault compared with the total hazard from all sources.
