April 4, 1640 Tsunami: Roer Valley, Germany

Reference #43 says: "Three shocks were felt. The inside waters of Holland were much disturbed." This is from Mallet and Mallet (Reference #1879) that says, "The ships in the ports of Holland were very much agitated, although it was quite calm." Vogt (Reference #3942), in his study of the original sources, says that these are accounts from the outer regions of the macroseismic area. He ascribes the agitation of the water detail to the Gazette de France of 1640: "...Le Rhin s'enfla acec un si grand bruit que les mariniers ne purent demeurer dans leurs bateaux comme ils avaient accountume..." [The Rhine had a great noise and swelled so that the mariners could not stay on their boats as they were accustomed.] The exact location is not known but perhaps is near Rotterdam, which is considered the main port at the mouth of the Rhine.