Signals from the four hydrophones of a (small) VLA (vertical linear array) are archived and made available, in real time, over the web, by NOAA's Pacific Marine Environmental Lab. These data can be seen at the SFSU on-line archive, downloaded from the PMEL site. The data are displayed as spectrograms, showing frequency on the horizontal axis (0 to 512 Hz) and time increasing upwards. The broad-band source was tested during the interval 17:00-20:00 UT on November 9, 2001.

Real-time web access to Pioneer Seamount data, from PMEL-NOAA

Spectrograms, November 9, 2001, 16:00-18:00 UT; broad-band source and humpback whales

Spectrograms, November 9, 2001, 18:00-20:00 UT. Clearer signals from source