Table 3. Sound levels of the pressure excitation exposures applied in the final experiments.

Stage	Measured sound levels			Strikes	Distance (m)
	Lz−p	SELss	SELcum
	(dB re 1 µPa2)	(dB re 1 µPa2s)	(dB re 1 µPa2s)
1	205	181	201	100	200
	210	186	206	100	100
2	205	180	200	100	200
	209	185	205	100	100
3–4a	205	181	201	100	200
	209	185	205	100	100

L_z−p  =  zero to peak sound pressure level, SEL_ss  =  single strike sound exposure level and SEL_cum  =  cumulative sound exposure level, see the text for further explanation. The last 2 columns present the corresponding distance from a ‘typical’ North Sea pile-driving installation and number of strikes.