21 documents tagués avec "Grid-based Analysis"

The excavation hazard is calculated on minodes that represent underground tunnels as a series of connected nodes. For more information on minodes and to find out how to create or update them, go to this page: Minode Generator

You can pick any grid cell to view the frequency magnitude chart of events found in the local area. This is the b-value used for this grid point. The b-value is a very sensitive parameter in hazard calculations, and there are cases where the automatic FM modelling algorithm may not work well. There are several markers to help identify potential areas where the FM model may not represent the data accurately:

The Grid and Plane Setup window is used to control which grid and planes are active for analysis across the application. Multiple planes can be selected depending upon the analysis objective. Use the 3D view to verify the spatial coverage of selected grid and planes prior to commencing the analysis.

A grid defines the three-dimensional analysis volume surrounding the area of interest. The grid is discretized into regularly spaced cells, onto which seismic parameters are interpolated based on the active analysis controls.

The Grid Point Investigation workflow in the Grid-Based Analysis follows a similar methodology to that used in the Hazard Assessment application. This consistency allows users to apply familiar investigative techniques when transitioning between applications, while maintaining comparable interpretation frameworks.

Grid-based seismic hazard assessment using seismic data for spatial hazard mapping and analysis.

Grid Based Analysis Parameters

If you pick a minode in the 3D View, the grid point sources that contribute to the hazard at that minode will be plotted, scaled by how much they contribute. Theoretically, every grid point contributes to the hazard at a minode, but there is an accuracy threshold applied with a minimum probability to speed up the calculations. Increasing the accuracy will result in more contributing grid point sources.

You can plot the GMPE in a couple of different ways:

Overview

Probabilistic seismic hazard evaluation based on grid and spatial methods.

Event rate calculations and splattering in grid-based hazard assessment.

The hazard assessment app is designed to be simple to use but beneath the interface is a lot of complexity. It is important to be familiar with the underlying calculations and ensure that you are aware of the assumptions and limitations of the analysis. The calculations have been described in the linked pages below.

There are three types of isosurfaces that can be plotted in the Hazard Isosurfaces window. The details behind the calculation of each parameter is linked in the pages below:

Grid Definition

A plane represents a two-dimensional surface within the three-dimensional analysis volume.

This window is designed to contrast short-term grid-based parameters with long-term cumulative parameters, enabling more informed interpretation of seismic response and rock mass behaviour.

This window is for the assessment of short-term responses. Triggers are selected from the list and response events for the selected triggers can be assessed with several tools:

The Standard Analysis window is the primary workspace of the Grid-Based Analysis application. It provides interactive visualization and analysis of seismic source parameters interpolated onto the selected grid and planes.

Hazard can be tracked over time by specifying a number of time steps and a step interval. The back analysis tool will step the backdate backward through time and summarise the hazard within each mining volume. Mining volumes can be defined in the Configuration area (link to filter volume editing page). The hazard within each mining volume is calculated by accumulating the hazard within each grid cell or for each minode within the volume.

The Void Ratio window allows users to calculate and visualize Void Ratio using the Mine Geometry Model (MGM). This analysis provides spatial context for excavation intensity and rock mass removal around grid points or minodes.