WEBVTT

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<v ->Represented by color in this spectrogram,</v>

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is sound intensity in the ocean recorded

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off Monterey, California

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through different periods of the cruise ship visit.

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The Star Princess arrived early

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in the morning of September 26th.

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While the ship was offshore,

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the ocean near Monterey was relatively quiet.

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(quiet ocean noise)

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As cruise ship approached Monterey,

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sound levels gradually increased,

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reaching a maximum when the ship was directly

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over the recording site.

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(loud ocean noise)

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Subsequently, low-frequency noise from the ship was detected

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throughout its approach to the anchor location.

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The Star Princess remained at anchor

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off Monterey for nine and a half hours.

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Although the ship was stationary,

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tender boats were busy transporting people

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between the cruise ship and Monterey.

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(loud whirring noise)

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Throughout the anchor period,

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noise from the ship was also detected at high frequencies.

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While this noise was above the limit of human hearing,

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it was within the range of hearing,

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of some marine mammal species.

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The loudest noise of the entire cruise ship visit,

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was detected upon departure.

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Compared to arrival, departure was far louder,

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particularly when the cruise ship was closely approaching

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the recording site, and when its propulsion system,

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at the stern of the ship was facing the recording site.

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Comparison of ship speeds during these periods,

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shows that the Star Princess,

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was traveling more than twice as fast upon departure,

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illustrating how noise levels increase

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with increasing speed.

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Immediately prior to departure,

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the ocean off Monterey was relatively quiet.

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(quiet ocean noise)

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Noise levels at the recording site again reached a maximum

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when the cruise ship was directly above.

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(loud cruise ship noise)

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And with departure, noise from the Star Princess faded

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from the Monterey ocean soundscape.