Here is the most recent activity as posted by the USGS for the DR region:
Earthquake Details
This event has been reviewed by a seismologist.
Magnitude 3.4
Date-Time Tuesday, May 24, 2011 at 14:55:14 UTC
Tuesday, May 24, 2011 at 10:55:14 AM at epicenter
Time of Earthquake in other Time Zones
Location 18.871?N, 67.693?W
Depth 8 km (5.0 miles) (poorly constrained)
Region PUERTO RICO REGION
Distances 75 km (46 miles) NW (311?) from Aguadilla, PR
75 km (47 miles) NW (309?) from Cab�n, PR
75 km (47 miles) NW (322?) from Rinc�n, PR
143 km (89 miles) ENE (70?) from La Romana, La Romana, Dominican Republic
170 km (106 miles) WNW (285?) from SAN JUAN, Puerto Rico
Location Uncertainty horizontal +/- 3.6 km (2.2 miles); depth +/- 31.6 km (19.6 miles)
Parameters NST= 11, Nph= 11, Dmin=58.5 km, Rmss=0.08 sec, Gp=198?,
M-type=duration magnitude (Md), Version=0
Source Puerto Rico Seismic Network, University of Puerto Rico
Event ID pr11144000
With the largest being:
Earthquake Details
This event has been reviewed by a seismologist.
Magnitude 3.9
Date-Time Friday, May 20, 2011 at 03:54:54 UTC
Thursday, May 19, 2011 at 11:54:54 PM at epicenter
Time of Earthquake in other Time Zones
Location 17.878?N, 65.596?W
Depth 6.5 km (4.0 miles)
Region PUERTO RICO REGION
Distances 28 km (17 miles) SSW (207?) from Esperanza, PR
32 km (20 miles) SE (124?) from El Negro, PR
33 km (21 miles) ESE (115?) from Emajagua, PR
64 km (40 miles) ESE (121?) from Bayamon, PR
71 km (44 miles) SE (145?) from Carolina, PR
77 km (48 miles) SE (140?) from San Juan, PR
Location Uncertainty horizontal +/- 0.6 km (0.4 miles); depth +/- 1.1 km (0.7 miles)
Parameters NST= 30, Nph= 30, Dmin=24.7 km, Rmss=0.3 sec, Gp=173?,
M-type=duration magnitude (Md), Version=2
Source Puerto Rico Seismic Network, University of Puerto Rico
Event ID pr11140003
***There has been alot of clustered activity in the region, however not in epic proportions**** Its seem historial IMO