Seismic network design

NW designIn the case of a standard mine network, the process of network design starts with the delineation of seismic hazard districts, i.e. zones of roughly equal seismic hazard level. Each zone may have different monitoring requirements, thus different needs for network coverage. A network is then designed and installed in order to satisfy these varying requirements.

It is advisable to subject seismic hazard districts and the network design to regular reviews to ensure that the performance is aligned with monitoring requirements.

stations per square km
sensitivity (mine magnitude)
0.5
0.7
1
0.3
2
0.0
3
-02

Network sensitvity: Sensor density is a key factor in determining the sensitvity of network. At average trigger level settings, the table below provides a rough guideline as to what can be expected from a given sensor density:

LocAccuracyLocation accuracy: The network's ability to locate seismic sources to within a certain error margin is a basic network design criterium. Location accuracy depends on magnitude and is modelled using suitable software packages. A common assumption is that at least five sensor sets are triggered by the event.

Different colors represent zones of varying location error.