The recently installed IMS Infrasound Station IS51, Bermuda

1. The recently installed IMS Infrasound Station IS51, Bermuda Paola Campus Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) IMS, Engineering and Development Section, Acoustic Monitoring Project e-mail: Paola.Campus@ctbto.org Roger Oldfield, Eng. TelecomConsultant e-mail: roger@telecom.bm ITW2008: P. Campus, R. Oldfield Bermuda, 3-7 November 2008

2. The installation of IS51 is the result of a very efficient teamwork involving the Bermuda Government, Local and Overseas Companies and Consultants, who provided the Provisional Technical Secretariat of CTBTO with a crucial contribution to the realization of the project

3. Cabinet Conclusion number 23(07)7 dated 19 June 2007 indicating the Cabinet’s approval for the establishment of an Infrasound Monitoring Station IS51 at five sites in Bermuda

4. Installation: July 2008

5. Location of IS51 in Bermuda

6. Installation works, July 2008

7. Installation works, July 2008

8. Installation works, July 2008

9. Installation works, July 2008

10. Installation works, July 2008

11. Examples of infrasound signals recorded at IS51

12. Natural events

13. Storm

14. IS51:

15. IS51:

16. IS51:

17. Can IS51 help track hurricanes in the future?

18. Man-made events

19. Flight activity

20. IS51: Flight activity

21. IS51: Flight activity

22. IS51: Flight activity

23. IS51: Flight activity

24. IS51: Flight activity

25. IS51: Flight activity

26. IS51: Flight activity

27. Quarry blasting

28. IS51: Wilkinson Quarry ~400m from H4

29. IS51: Wilkinson Quarry ~400m from H4

30. IS51: Wilkinson Quarry ~400m from H4

31. IS51: Wilkinson Quarry ~400m from H4

32. Old Club Med Implosion

33. Club Med Demolition St. George, Bermuda 25th August, 2008

35. Interior Demolition All asbestos containing materials has been removed from the building The internal demolition included the following: Removal of all Non-Load Bearing Walls Removal of any remaining debris Removal of all material, leaving only the structural members

36. Before After

37. The Implosion Process The building will not be blown up. Explosives will be used as a tool to displace selected load-bearing members in a controlled sequence to cause a progressive collapse of the structure within the building footprint. Total weight of Explosives was 730 lbs 2,030 sticks of Dynamite or Explosive Charges

38. Columns • Pre-determined columns will be drilled and prepared for the placement of explosives. • Explosives will displace the selected load bearing columns. • Typical Charge Placement with plug and detonator.

39. Over 1,700 horizontal bore holes will be drilled at column and wall positions. • Holes will provide acceptance for predetermined quantities of high explosives. • Holes will be drilled roughly 2/3’s the depth of the column. Explosives will be place in the holes and then plugged with a sealing material.

40. Walls • Secondary masonry wall units on the lower two levels and selected upper floor level will be modified. Modification is to include making columns in shear walls, elevator shafts, and stairwells. • Selected sections of the end walls will be modified in order to create planes of failure for the east and west wings of the structure.

41. Protection • Covering Protection will be installed on/around the structure to create a blast curtain. • Approximately 35,000 square feet of 11 ½ - gauge fencing and 80,000 square feet of geo-textile fabric will be used for protection.

42. Vibrations The performance phase of the explosive demolition work will create a 7-second duration per an “Impact Event.” During this relatively concise demolition period three physical force types will actively emerge and produce their respective levels of vibration and air over-pressure values. The following are the stated forces as they relate to blast data criteria: Air Transmitted Over-Pressure (Concussion) Vibration per Explosive Detonation Dynamic Compaction per Structural Collapse

43. Seismic Monitoring A geological firm will be employed to perform pre-blast survey inspections on selected adjacent properties prior to the scheduled demolition date. The survey will address the stated area and document their findings per existing conditions. The same firm will then conduct a post-blast survey to inspect the post-blast conditions of the selected areas around the site. Seismographs will be placed in strategic locations, which will surround this structure and monitor the seismic impact of the event which will provide us with the magnitude of both vibrations and air over-pressure. Seismic Locations and Readings: #1 was placed 381ft North West of Blast Site - 0.35in/s at 64 Hz, >148 dB #2 was placed 390 ft North of Blast Site - 0.17in/s at 64 Hz, >148 dB #3 was placed 690 ft South East of Blast Site - <0.10in/s at 64Hz, <125 dB #4 was placed 175 ft South West of Blast Site – 0.16in/s at 23 Hz, 141.8 dB

44. Implosion video link:F:\ITW 2008\presentations\Session 3 - The International Monitoring System\3-05 Campus Oldfield\VIDEO_TS\VTS_01_0.IFO

45. Results of analysis of data recording the Club Med Hotel implosion on the 25th August, 2008 using the Progressive Multi-Channel Correlation technique Data filtered between 0.4 and 8 Hz

46. IS51: Old Club Med implosion 2008/08/25: location of Old Club Med and of IS51

47. IS51: Old Club Med implosion 2008/08/25

48. IS51: Old Club Med implosion 2008/08/25

49. IS51: Old Club Med implosion 2008/08/25 Detail of waveforms

50. IS51: Old Club Med implosion 2008/08/25