Display modes, wireframe views, and distance measuring tools for 3D visualisations

Charts

Energy and moment are two independent measures of the strength of a seismic event. Their physical meaning and how they are calculated was described in a previous post. Analysis of the relationship between the energy and moment of events can provide insight into seismic sources. For example, blasts or ore pass noise, falsely processed as real events, tend to have distinct zones on an energy-moment chart. In general, events with higher-than-average energy are associated with high relative stress.

Discover how to create complex filter setups for specific analysis tasks

For a few months now, a new tool has appeared in the General Analysis app; the hanging wall (HW) and footwall (FW) filter. The HW-FW filter allows you to filter your events based on where they are in relation to ticked survey/s. If more than one survey or plane is used for the HW-FW filter, they need to be somewhat parallel in order to make sense.

Analysing seismicity around large events

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:

IMS and ESG sites should have moment tensors loaded in with the events table automatically.

A geotech's guide to understanding moment tensors.

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.

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.

Time charts plot various hazard parameters over time, or, by time of day:

That is the question. An explainer on seismic hazard measurement.