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One assumption we have made in this study is that all seismic stations in the network can record the primary phase arrivals from all events. In reality, only close enough stations can detect useful signals for the seismic events below a certain magnitude. The detection capabilities of stations also depend on the focal mechanism of the events, attenuation structure, and noise level. The synthetic demonstration examples shown in this study can be viewed for only the seismic events that are large enough to be recorded by all seismic stations. Based on the detectability of the smallest seismic events needed to monitor, similar approaches as we describe in this chapter can be applied to different scales.

Different data‐processing procedures, such as single‐component versus multicomponent data processing, single‐station versus array‐signal processing, first arrivals only versus multiple phases, and different location techniques (e.g., Lin & Shearer, 2005; Pesicek et al., 2014), may generate slightly different location results for the same network distribution, but the trade‐off curve between the event location accuracy and the number of seismic stations can still be obtained using the approach described in this chapter.

Figure 4.12 Event location accuracy versus the total number of geophones for optimal design of a borehole geophone array in Figure 4.10.