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5.2.3. Scenario 3

Figure 16. Sinlge pulse SEL contour map for Scenario 3. Bathymetry contours are labelled in metres.

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Table 15. Flat-weighted SEL radii for Scenario 3. SEL Threshold (dB re 1 µPa2s)

Flat-weighted (km) Rmax R95%

120 >230 >180 130 >140 >110 140 >110 61 150 14 9.9 160 3.3 2.7 170 1.2 1.0 180 0.21 0.16 186 0.10 0.10 190 0.051 0.051 198 0 0

Table 16. M-weighted SEL radii for Scenario 3. SEL Threshold (dB re 1 µPa2s)

LFC (km) MFC (km) HFC (km) PINN (km) Rmax R95% Rmax R95% Rmax R95% Rmax R95%

120 >230 >180 >220 >120 >180 >110 >230 >170 130 >140 >110 >120 >100 >120 >100 >130 >100 140 >110 65 39 26 28 18 >100 52 150 14 9.7 7.8 7.1 4.8 4.2 9.3 8.2 160 3.2 2.7 1.7 1.5 1.5 1.3 2.0 1.7 170 1.2 0.98 0.38 0.34 0.27 0.27 0.54 0.47 180 0.21 0.16 0.050 0.050 0 0 0.16 0.16 186 0.071 0.071 0 0 0 0 0 0 190 0.050 0.050 0 0 0 0 0 0 198 0 0 0 0 0 0 0 0

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Figure 17.Single pulse rms SPL contour map for Scenario 3. Bathymetry contours are labelled in metres.

Table 17. rms SPL radii for Scenario 3.

rms SPL threshold (dB re 1 µPa) Distance to threshold level (km) Rmax R95%

120 >230 >180 130 >140 >110 140 >110 60 150 20 14 160 6.7 4.8 170 1.9 1.5 180 0.65 0.56 190 0.14 0.14

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Figure 18. Single pulse peak-to-peak SPL contour map for Scenario 3. Bathymetry contours are labelled in metres.

Table 18. Peak SPL radii for Scenario 3. Peak SPL threshold (dB re 1 µPa)

Distance to threshold level (km) 0-Pk Pk-Pk

180 3.7 7.4 190 1.7 2.3 200 0.36 1.0 206 0.15 0.35 210 0.10 0.17 218 0.050 0.070 220 0.040 0.060 230 <0.010 <0.010 240 <0.010 <0.010

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5.2.4. Scenario 4

Figure 19. Cumulative flat-weighted SEL over 24 hours for the 3940 in3 airgun array operating in August. *186 dB re 1 µPa2s denotes the cSEL injury threshold for pinnipeds. Bathymetry contours are labelled in metres.

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Figure 20. Cumulative LFC-weighted SEL over 24 hours for the 3940 in3 airgun array operating in August. *186 dB re 1 µPa2s denotes the cSEL injury threshold for pinnipeds. Bathymetry contours are labelled in metres.

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Figure 21. Cumulative MFC-weighted SEL over 24 hours for the 3940 in3 airgun array operating in August. *186 dB re 1 µPa2s denotes the cSEL injury threshold for pinnipeds. Bathymetry contours are labelled in metres.

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Figure 22. Cumulative HFC-weighted SEL over 24 hours for the 3940 in3 airgun array operating in August. *186 dB re 1 µPa2s denotes the cSEL injury threshold for pinnipeds. Bathymetry contours are labelled in metres.

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Figure 23. Cumulative PINN-weighted SEL over over 24 hours for the 3940 in3 airgun array operating in August. *186 dB re 1 µPa2s denotes the cSEL injury threshold for pinnipeds. Bathymetry contours are labelled in metres.

Table 19. Flat- and M-weighted cumulative SEL areas of ensonification above threshold levels for Scenario 4. Areas and ranges offset from the survey line were calculated from the cSEL contours in Figures 19-23.

SEL Threshold (dB re 1 µPa2s)

Total Area (km2)

Range from the survey line to the contour (km)

186 (Flat-weighted) 387.9 1.750 198 (Flat-weighted) 20.0 0.100 198 (LFC) 17.5 0.085 198 (MFC) 1.8 <0.01 198 (HFC) 0.6 <0.01 186 (PINN) 105.2 0.600