An earthquake has happened somewhere in British Columbia. You have seismic data from 3 different seismometers; one is in Dawson Creek, one is in Fraser Lake, and one is in Stewart. The 'gap time' - time between measuring P-waves (moving at 6 km/s) and S-waves (moving at 4 km/s) is available for each seismometer. For example, in Steward, the S- waves were detected 40 seconds after detecting P-waves. The rest of the data is in the table. Where is the epicentre of the earthquake? Queen Charlotte City Queen Charlotte Islands Atlin Atlin Lake Masset Stikine R Stewart Prince Rupert Port Alicer Vancouver Island Williston Lake Fraser Lake Bella Coola Ucluelet Mackenzie Fort St. James Fort Nelson Port McNeill Hudson's Hope Dawson Creek Fraser R Williams-Lake Lillooet FI Fraser R Victoria Valemount Kinbasket Lake Ashcroft Vancouver Penticton Town Gap Time (time between detecting P- Waves and S-Waves) British Columbia, Canada Colombie-Britannique Scale/Echelle 0 100 200 300 400 km Golden FI Columbia R Cranbrook Dawson Creek 51 s Fraser Lake 23 s Stewart 40 s

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