The Porto Rico earthquake of 1918 with descriptions of earlier earthquakes: Report of the Earthquake Investigation Commission
Govt. Print. Off., 1919 - Nature - 74 pages
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a. m. _ a. m. St aftershocks Aguadilla alluvial alluvium Anasco arches Arecibo badl badly cracked buildin cable Canovanas centimeters chieﬂy concrete blocks cracks were formed Croix damage deﬁnite displacement distance earth earthquake east fathoms fault ﬁg ﬁrst shock ﬂat Guanica harbor horizontal houses Humacao III—IV injured intensity Isabela Isolina isoseismal kilometers light shocks main walls mamposteria buildings Manati Maunabo Mayaguez minutes Mona Passage mortar movement November 12 October 11 October 24 places Point Borinquen Ponce poor mortar Porto Rico PORTO RICO EARTHQUAKE records reported residual soil Rincon rock roof San German San Juan San Salvador Santo Domingo sea level sea wave Sept shock was felt slopes small cracks strong shocks surface Thomas Tortola tower town uake Utuado vertical vibrations Viequez Virgin Islands west wall