Memphis was at anchor off a rocky beach in of water in the harbor of Santo Domingo on the afternoon of 29 August 1916 with two of her 16
boilers operating in case she needed to get underway; the
gunboat also was anchored in the harbor. Shortly after 12:00,
Memphis began to roll heavily and Captain Beach observed an unexpected heavy swell developing.
Memphis and
Castine both made preparations to leave the harbor and began to raise steam;
Memphis expected to be able to get underway at about 16:35. Conditions in the harbor had deteriorated badly by 15:45, when
Memphis sighted an approaching wave of yellow water stretching along the entire horizon. By 16:00, the wave was closer, had turned
ochre in color, and had reached about in height; at the same time,
Memphis was rolling 45°, so heavily that large amounts of water cascaded into the ship via her
gun ports and water even was entering the ship via ventilators above the
waterline. By 16:25, water began to enter the ship via her funnels, above the waterline, putting out the fires in her boilers and preventing her from raising enough steam to get underway. She began to strike the rocky harbor bottom at 16:40, damaging her propellers just as she was raising enough steam to begin moving, and her engines lost steam pressure. At about this time, the giant wave
Memphis had seen approaching over the past hour arrived; she rolled into a deep trough and was struck immediately by what proved to be three very large waves in rapid succession, the highest of them estimated by the crew to have been in height, completely swamping her except for her highest points, and washing crewmen overboard. The waves rolled her heavily, caused her to strike the harbor bottom, then pushed her to the beach away. By 17:00, she had been driven under cliffs along the coast of the harbor and was resting on the harbor bottom. She was battered into a complete wreck in 90 minutes.
Castine, meanwhile, managed to reach safer waters by getting underway and putting to sea through the large waves, although damaged by them and at times in danger of capsizing.
Memphiss casualties numbered 43 men dead or missing – 10 of them washed overboard by the waves or killed by steam as the ship's powerplant broke up, another 25 lost as they returned from
shore leave in the ship's motor
launch and were caught in the harbor by the huge breakers, and eight more lost in three boats wrecked after dark as they attempted to reach shore – and 204 badly injured. Due to their heroic actions during this incident,
Chief Machinist's Mate George William Rud,
Lieutenant Claud Ashton Jones, and
Machinist Charles H. Willey were awarded the
Medal of Honor. File:Rud1adj.jpg|George Rud File:Jones CA NHC 48727.jpg|Claud Jones File:Charles H Willey.jpg|Charles H. Willey
Alternative explanations for the wreck In his 1966 account of the incident,
The Wreck of the Memphis, Captain Beachs son,
Edward L. Beach Jr., ascribed her loss to an unexpected
tsunami exceeding in height, and this explanation has been carried forward by most sources discussing her loss. More recent research, however, has called this explanation into question. No record of any seismic event in the Caribbean on 29 August 1916 that could have triggered a tsunami has been found, and the rate of advance of the large wave
Memphis reported – about an hour to cross the distance from the horizon to the ship – matches that of a wind-generated ocean wave (possibly a
rogue wave); a tsunami, in contrast, would have covered the distance in only a few minutes. The periods of the three large waves that struck
Memphis also are characteristic of large wind-generated waves rather than tsunamis. A likely source for such large, wind-generated waves in Santo Domingo Harbor on 29 August 1916 does exist, in that three
hurricanes active in the Caribbean between 12 August and 2 September 1916 passed westward just to the south. Waves generated from these storms could well have combined to create a large wave like those that struck and wrecked
Memphis. Such a circumstance appears to explain the loss of the ship better than the tsunami theory. Oceanographer Dr. George Pararas-Carayannis in particular published an extensively detailed rebuttal demonstrating that a tsunami could not have caused the foundering of
Memphis, but that the last of the three hurricanes,
category 1 Hurricane Eight, likely did, creating a wave that reached a breaker height of as it approached
Memphis. This swamped the cruiser, anchored in only of water, and would have done so even had the ship been at full maneuvering power. Pararas-Carayannis concluded that had
Memphis been anchored in of water, she would have ridden out the swells, including the killer wave. ==Salvage efforts==