San Francisco State University Physics and Astronomy Department SFSU Pacific Oceanography Project SFSU Private Area. WARNING: Material on this page is work in progress; results and conclusions may change without notice. Least-Squares Fit to a Blue-Whale "B" Call

Figure 1. A 40-second-long blue-whale call. The signal is from only hydrophone 4 (100 m above the sea floor), band-pass- filtered with a band of 12 to 18 Hz. The red line shows the envelope, calculated by averaging the rectified signal.