October 11, 1918, dhulgariir xoog leh ayaa ku dhuftay xeebta galbeed ee Puerto Rico
waxayna keentay Tsunami. Dhulgariirkii 1918 waxaa sababay qalad hore oo garab bidix ah oo u dhow Mona Passage. Sanadkii 1953, Santo Domingo, Dominican Republic, waxaa saameeyay dhulgariirkii Santo Domingo. Aagga dhabta ah ee hoos u dhaca (Puerto Rico Trench) ma uusan dillaacin in ka badan 200 oo sano, taas oo ah walaac weyn oo ku saabsan geophysicists, maadaama ay aaminsan yihiin inay sababi karto dhacdo weyn.