http://info.er.usgs.gov/fact-sheets/neic/9.html (World Wide Web Directory, 06/1995)

National Earthquake Information Center

Preliminary Determination of Epicenters (PDE) Monthly Listing

The PDE Monthly listing is a monthly publication that lists parameters (date, time, location, magnitude, number of stations used, geographic region, and comments) for all earthquakes located by the NEIC for a given month. An average month includes about 1500 events. The publication also includes additional source parameters, waveform plots for selected events with MB>=5.8, maps showing the locations of the earthquakes that occurred that month, and a map of focal mechanisms, computed for selected events. The January issue for each year also contains a listing of significant earthquakes of the previos year.

The PDE Monthly Listing is available on a subscription basis.

Subscriptions and single issues may be obtained from:

	Superintendent of Documents
	U.S. Government Printing Office
	Washington, D.C. 20402
	(202)783-3238

Back issues, beginning with 1985, are available in quarterly form (papercopy or microfiche format) from the USGS Open-File Reports Sales. Back issues for the period 1975 - 1984 are available only as single monthly copies in paper copy format. Prices and ordering informaiton may be obtained from:

	U.S. Geological Survey
	Books and Open-File Reports Section
	P.O. Box 25286
	Denver Federal Center
	Denver, CO 80225

	(303)236-7476

Please note there is a time lag of approximately five months in collecting and publishing data for the PDE Monthly Listing, so there is a similar time lag when subscribing to this publication. Several additional months may be required before Monthly Listings are available as a quarterly report form the Open-File Reports Sales.

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