The New Jersey Geological Survey Digital Geodata Series DGS04-1 dataset shows earthquakes that had epicenters in New Jersey. This data has 204 earthquakes with epicenters in New Jersey. Most are minor with magnitudes ranging from 0.4 to 5.3 and depths up to 25 km below sea level. Earthquakes with magnitude of 0 (zero) implies that the magnitude is unknown.
Following earthquake added since November 8, 2017 version:
1) 23.0 km NE of Hammonton, NJ on 06-21-2018, 00:28:38 (EST), Magnitude 1.65, Depth 12.00 km.
Various Data Sources and References:
Coffman, J. L. and von Hake, C. A., ed., 1973, Earthquake history of the United States: U. S. Department of Commerce, National Oceanic and Atmospheric Administration Publication 41-1, Revised edition (through 1970).
Dombroski, D. R., 1992, Catalog of NJ Earthquakes Through 1990: N.J. Geological Survey, Geological Survey Report 31, 16p.
Eppley, R. A., ed., 1965, Earthquake history of the United States: U.S. Department of Commerce, Coast and Geodetic Survey Publication 41-1 Revised (through 1963).
Richter, C.F., 1935, An instrumental earthquake magnitude scale: Seismological Society of America Bulletin, v. 25 p.1-32.
Smith, W.E.T., 1962, Earthquakes of eastern Canada and adjacent areas, 1534-1927: Publication of the Dominion Observatory, Ottawa, v.24, no. 5.
Smith, W.E.T., 1966, Earthquakes of eastern Canada and adjacent areas, 1928-1959: Publication of the Dominion Observatory, Ottawa, v.32, no. 3.
Sykes, Lynn R., John Ambruster, Won-Young Kim , Leonardo Seeber and Klaus Jacob, Appendices to paper Earthquakes in the Greater NY City-Philadelphia Area: 1677-2004. (http://www.ldeo.columbia.edu/~sykes/pages/EqCatNYC-Phil.html
Stover, C.W., and Coffman, J.L., 1993, Seismicity of the United States, 1568-1989 (Revised) U.S. Geological Survey Professional Paper 1527.
Stover, C.W., Reagor, G., and Algermissen, S.T., 1984, United States earthquake data file: U.S. Geological Survey, Open-file Report 84-225, 123p.
Wood, H. O, and Neumann, Frank, 1931, Modified Mercalli scale of 1931: Seismological Society of America Bulletin, v.21 no. 4, p. 277-283.
LCSN - Lamont Doherty Cooperative Seismographic Network. (http://www.ldeo.columbia.edu/LCSN/
NEIC- National Earthquake Information Center.(http://earthquake.usgs.gov/regional/neic/index.php
NESN - New England Seismic Network. Weston Observatory. (http://www.bc.edu/research/westonobservatory/
PDE (Preliminary Determination of Epicenters) -USGS/NEIC PDE Monthly list. (ftp://hazards.cr.usgs.gov/pde/manuscript/