Pioneer Seamount data archive RTC Pier data archive
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WHALES These sounds were recorded by Jackie Dragon from the Kittikat in a pod of humpback whales. Listen for a first sequence of hoots, followed by a louder, lower one. [wave file | FLASH
Spectrogram of sound recorded during a relatively quiet period in the ocean. Recorded during Seaflow's ocean trip of July 12, 2008, outside the Golden Gate, SE of Point Bonita. The ocean is quiet enough that the main sound recorded is the lapping of waves against the hull of the excursion boat (the Kitty Kat).

Spectrogram of sound recorded during the passage of a tanker, about half a mile away. Recorded during Seaflow's ocean trip of July 12, 2008, outside the Golden Gate, about two miles west of Point Bonita. The tanker's prop noise drowns out the lapping of waves, and would mask many sounds used by marine mamals for communication or navigation.

Comparison of sound during the quiet period and during the passage of the tanker.

This spectrogram shows spikes of high frequency filling the screen. Listen to the sound - you can still hear the waves lapping against the boat's hull, but there is a constant background of clicks. We think that these come from snapping shrimp. We heard the sounds only near the South Farallones, in Captain's Cove (?) and over Hurst Shoal.
You can also hear the sea lions barking.


(More about the snapping shrimp.)