1. POLARIS Underground Project at SNO (P.U.P.S) Gail M. Atkinson Eleanor Sonley San Linn I. Kaka Carleton University

2. 2 Seismic waves composed of Source effects –Resulting from nucleation of earthquake Path effects –Geometric spreading and anelastic attenuation with distance from hypocentre Site effects –Amplification due to near surface rock/soil

3. 3 Purpose Measure attenuation due to uppermost 2 km of a hard rock site Frequency dependence of transmission to surface Free surface effects Measuring source effects of small earthquakes Teleseismic effects

4. 4 Earthquakes happen all the time http://www.iris.edu/seismon/Today at 2:20 pm

5. 5 Run Seismic Waves Seismic Sources… http://www.iris.washington.edu/edu/software.htm

6. 6 Seismic Sources…

7. 7 Instrument Locations 3 currently operational

8. 8

9. 9 Clean Lab at 6800 Level – Junction Area

10. 10 Surface Station 1 – Rock outcrop beside warehouse

11. 11 4600 Level – former germanium detector lab

12. 12 Instrument Locations 3 currently operational Planned (remainder of this week)

13. 13

14. 14 Data Collection Extract events of interest

15. 15 Data already collected Blast recorded at clean lab site

16. 16 Data already collected Same blast recorded on rock outcrop

17. 17 Data Collection Extract events of interest Exchange hard disk -Future analysis

18. 18 The SNOlab advantage Distant from surface effects Very Low noise Very hard rock 3D distribution of stations Existing infrastructure