Some of these are interesting - the 1938 waves had to be caused by the Great Hurricane that hit Long Island:
November 14, 1840 - Delaware River: referred to as “The Great Swell on the Delaware River”
• January 9, 1926 – Maine: No one was injured, but “monster waves” hurled 50 fishing boats ashore and washed thousands of flounder from their winter beds in the Harbor bottom mud”.
• Aug 19, 1931 Atlantic City, NJ 3 Dead
• Sep 21, 1938 New Jersey coast Scores injured, some seriously
• Jul 3-4, 1992 Daytona Beach, FL 75 injured - this one I remember. Calm moon lit night, people on the beach saw a huge wave coming in and started running away. Incredibly, no one killed.....cars tossed around. Likely caused by off shore ocean floor upheaval.
The biggest risk to the east coast is associated with giant landslide somewhere close to Africa. Estimated to throw a 300' wave......that would be hard to handle. Do a quick check - you'll find the reference.