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. 2018 Jan 10;5(1):170110. doi: 10.1098/rsos.170110

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© 2018 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Estimated noise levels based on field recordings of a 10 inch³ airgun at high output pressure (120 bar) by Hermannsen et al. [38] shown as (a) received level peak–peak (L_pp), (b) received level RMS over 125 ms (L_eq-fast) and (c) sound exposure level (SEL). (c) Audiogram-weighted SELs using a harbour porpoise audiogram from Kastelein et al. [40,41]. The linear transmission loss model is given in each panel. Vertical grey bars show the estimated exposure range of the harbour porpoises included in this study incorporating a 50% error range in distance from the exposure site. The blue lines indicate the estimated range of noise exposure levels (L_pp, L_eq-fast and SEL) experienced by the harbour porpoises in this study.