Dan Sandiford edited Results.md  over 9 years ago

Commit id: b64f074171189b960fc48ba66e3d4aab074880ce

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This event near Korumburra was recorded on both borehole and surface instrauments, however the waveform is much clearer on borehole equipment. Whilst P-wave arrivals can be easily detected on borehole stations, they are difficult to detect on surface stations. S-waves arrivalls from borehole stations will substantially improve event location.   Figure 1 shows this event at the nearest borehole station, and figure Figure  2 shows the corresponding STA/LTA filter response, which is commonly used for automatic event detection. Figure 3 shows the P and S-wave picks from the borehole station most distanct to furthest from  the event. Figure 4 shows the event at the nearest (telemetered) telemetered  surface staion. Whilst the event is clearly present on the surface record, the signal to noise level is much smaller. Also, no clear S-wave arrival can be determined. The corresponding STA/LTA filter shows multiple spikes of similar amplitude, meaning that automatic detection would be difficult for this event.