Following earthquakes added since Feb. 18, 2009 version:
1) 2.25km ESE of Pennsville, NJ on 7-1-2009, 9:44 am (EST), Magnitude 2.8, Depth 5 km
Purpose:
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.
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/>)
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Most of the earthquakes in this database were recorded with seismic equipment. The older earthquakes, included were not recorded by seismic equipment but were documented by NEIC, and the USGS. Instrumental epicenter accuracy is estimated to be within 0.0 degrees to 0.5 degrees and non-instrumental accuracy ranges from 0 degrees to 2.0 degrees (Stover, 1984 and NEIC). Earthquakes with magnitude of 0 (zero) implies that the magnitude is unknown.
Following earthquakes added since Feb. 18, 2009 version:
1) 2.25km ESE of Pennsville, NJ on 7-1-2009, 9:44 am (EST), Magnitude 2.8, Depth 5 km