On 22 September 2003 a Mw 6.4 earthquake occurred beneath the northern coast of Hispaniola near the resort city of Puerto Plata, Dominican Republic. The earthquake caused extensive damage in Puerto Plata, as well as in the regional capitol of Santiago, located 30 km south of the coast (Figures 1 and 2). A large (Mw 5.6) aftershock occurred about one hour after the mainshock, and felt aftershocks continued for more than a month. The large north-south extent of the aftershock zone, the mainshock focal mechanism, and geologic evidence for an active fold-thrust belt offshore of Hispaniola...

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