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| Discovery of the SOFAR channel. Shot 43 recorded aboard the R/V Saluda on April 3, 1944. Charges were exploded at a depth of 4000 feet and a range of 320 nautical miles. Times are labeled for 370, 371, ... , 374 seconds following the explosion. Channel 1 shows time markers. The remaining channels show the received signal after different types of signal processing. (Adapted from Ewing and Worzel, 1948. Ewing and Worzel recording from Fig. A.1 of Munk et al., 1995) |