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Long range shock waves from a large explosion underwater: experiment and data primary position fix. Decca main chain 2A LOPs were also recorded and computed for comparison. All positions were computed in Airy spheroid, OSGB 36 datum and expressed as latitude and longitude. Data for all fixes were recorded in hard copy on a graphics printer. Vessel guidance was given through a range of steering and target displays on a colour monitor adjacent to the steering position. 24
Long range shock waves from a large explosion underwater: experiment and data 4. OPERATIONS AT SEA Major operations at sea were photographed and filmed throughout the experiment by ARE and BGS photographic personnel. A video of the experiment has been made, and can be made available. 4.1 SHOT SITE The Salmaster proceeded to the shot position to deploy the mooring buoys for the explosives (Fig.2.4 and Plate 1). Following the deployment of the mooring buoys, the vessel moved very gently forward to the marker buoy using the bow thrusters. Vith an observer on the walkway between the horns, the marker buoy (Plate 2) was hauled up over the bow until the shackle ring was sighted directly below the observer. The shot position, taken as the shackle ring, was then fixed by Sy1edis as detailed in Appendix B. 4.2 PUSS DEPLOYMENT Deployment was carefully co-ordinated by constant communication arrangements between the bridge and operators on deck. All six PUSSes were deployed on schedule in accordance with the logs shown in Appendix A However, as unfavourable weather conditions delayed the shot firing during the first deployment of the PUSSes, they were retrieved, reset to cover the final set of recording windows (Table 4.1 and Fig. 4.1), and redeployed according to the schedule given in Appendix C. 4.3 BGS STATION Following the first deployment of the PUSSes the Sa1master sailed to the BGS position and deployed the SBP according to the procedure and log given in Appendix C. The SBP cable was disconnected from the ship and buoyed-off until after the second deployment of the PUSSes. On returning to the BGS station the cable was retrieved using the Gemini. Deployment of the VHS was then carried out as shown in Fig. 3.5. The recording systems had already been installed in a portacabin below the forward deck. 25
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Page 11 and 12: Appendix G: Picking list for travel
Page 13 and 14: Figures Fig. 2.1 Fig. 2.2 Fig. 2.3
Page 15: Fig. 7.3 Plot of travel time agains
Page 19 and 20: I,on.!: rC/ngc s/roc/.. II'(/\'CS /
Page 21 and 22: ,(//lg rallge s/roc/.. 11'111'(',\
Page 23: I,ollg rtlllge siwek waves fro//1 (
Page 26: .Ollg rallge shock waves from a {ar
Page 29 and 30: ,(/lIg rangc sImek II'(H'CS /1'0111
Page 31: LOllg rallge shock II'(/ves /1'0111
Page 35 and 36: Long range shock waves from a large
Page 39: Long range shock waves from a large
Page 61: Acknovledgeaents For producing the
Page 64 and 65: Hamilton, E.L., 1980. Geoacoustic m
Page 66 and 67: Newmark, R., 1984. Tables of ground
Page 68: Table 2.1 Proposed spacing for inst
Page 72 and 73: Overall length standoff at surface
Page 74 and 75: Table 3.3 VHS - SPECIFICATIONS Hydr
Page 76 and 77: Table 3.5 Calibration of Pull Up Sh
Page 79 and 80: series Solid Geology. 3: Dunbar she
Page 82 and 83: 01 01 Table 5.1 Explosion shot time
Page 85 and 86: (a) fname Table 7.1 Header block co
Page 87: Table 8.1 Comparison of measured ex
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Step 1 GEMINI takes 55Kg weight att
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90 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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Appendix A: Proposed schedule for L
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16:47:00 16:47:20 16:47:30 16:47:34
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08:12:45 08:12:50 08:13:00 08: 13:2
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PUSS 3 (INSTRUMENT 11) REDEPLOYED 2
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PUSS 6 (INSTRUMENT 14) REDEPLOYED 2
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Appendix C: Locations of sites at s
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(2) PUSS LOCATIONS SITE 1 (PUSS 2)
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Fix: 56°42.810N aN = .001N +1 m 01
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Appendix D: MODELS FOR COMPUTER SIM
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.... N Table D2 Paraaeters of preli
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(c) Permanent land stations with a
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4 13 5 14 Hydr. z x y Hydr. z x y R
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5 14 Hydr. Z X y Hydr. z X y First
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F.3.9 PUSS 10 at 9.982 km, 9001b sh
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I-' W en Fig. F.1.2 PUSS 11. RANGE=
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.... w
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.... t Fig. F .1.10 PUSS 11, RANGE=
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.... (JI .... Fig. F.2.2 PUSS 11. R
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I-' U1 CD Fig. F.2.1O PUSS 10, RANG
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.... m I\) Fig. F.2.13 PUSS 13, RAN
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Fig. F.2.16 BGS Sea Vertical Hydrop
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I-' -oJ w Fig. F.3.6 BGS Sea Bottom
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I-' ()) 0 Fig. F.3.13 BGS Sea Botto
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.... (J) 0 Fig. F.3.13 BGS Sea Bott
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Start of record = 11:52:05.0 Filena
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Start of record = 15:22:05.0 Filena
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BGS VHS Start of record = 11:53:13.
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Plate 16 Plate 17 Plate 18 Plate 19
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Plate 4 Plate 5 Plate 6
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Plata 10 Plate 1 1 Plate 12
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Plate 16 Plate 17 Plate 18
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Plate 22 Plate 23
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Plate 28 Plate 26
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