Mining Induced Seismicity

📄️ Mining Induced Seismicity

This suite of apps provides tools for the analysis and interpretation of mining induced seismicity and the management of seismic hazard.

📄️ Event Magnitudes

Why are the event magnitudes different in mXrap?

The Grid Based Analysis application can be used to evaluate the spatial distribution of various seismic parameters. There are a range of source parameter options available, and they can give indications to the rock mass behaviour. Some parameters can be considered as a proxy (stand-in) for rock mass stress, while other parameters can be a proxy for the amount of deformation. There are also parameters available that are associated with the rock mass mechanism or event type.

📄️ Hazard Assessment - Event Rate

The Hazard Assessment application uses a grid-based approach to describe the seismic hazard throughout your mine. Each grid point essentially represents a seismic source with a specific frequency-magnitude relationship. A frequency-magnitude relationship is defined from the $M$, $Mmin$, $b$-value, and event rate. We've previously delved into $M{UL}$ in this post. We also discussed how $Mmin$ and $b$-value are calculated along with other gridding parameters in this post. The event rate is something we haven't taken a dive into yet, so we'll get into it in this post.

📄️ Hazard Assessment

Background filters

📄️ Mine Geometry Models

Stope, cave and development geometry is a fundamental aspect of most geotechnical analysis. Mine geometry also varies over time and capturing these changes is critical in any back analysis or numerical modelling that investigates stability or monitoring parameters over time. This is a utility app to create models of mine geometry that can be exported to facilitate a wide range of applications such as:

📄️ Minode Generator

Mine Geometry Model Minode Generator is a new utility app which enables you to generate your own new minodes from a mine geometry model. If you're not sure what minodes are or why you would want to generate them, see What are minodes? If you're not sure what mine geometry models are, see Mine Geometry Models Application.

📄️ Modifying The Blast Record

When trying to add, delete or change blasts in mXrap, best practice is to use the 'Blasts Editor' found under the 'General Set-Up Windows' tab

📄️ Omori Analysis Tools

Where is the cumulative energy line on the Omori chart?

📄️ Seismic energy and moment

You know that energy and moment are parameters to describe seismic events. But what exactly is their physical meaning for a seismic event source and how are they calculated?

📄️ Seismic Event Quality

Data Anomaly Detection

📄️ Seismic Monitoring

Seismic activity rate monitor

📄️ Seismic source parameters - quick guide

As mentioned in the last blog post, energy and moment are independently calculated based on the displacement and velocity spectra of the recorded waveforms. Another spectral parameter is the corner frequency.

📄️ Stochastic declustering explained

As mentioned in the last blog post, a stochastic declustering algorithm has been implemented in mXrap to separate events into 'clustered' and 'background' components. It can be useful when designing seismic exclusions and re-entry procedures to separate seismicity that occurs in short bursts from seismicity that has low variability in space and time. Short-term exclusions cannot be used to manage the risk associated with background seismicity, since the hazard inside a potential exclusion would be the same as outside the exclusion. Efficient exclusion and re-entry procedures target areas where seismicity is most clustered and where the seismic hazard to which people are exposed can be reduced with a short disruption to production.

Mining Induced Seismicity

🗃️ General Analysis