Front Matter (PDF) - Seismological Research Letters

EASTERN SECTIONof theSeismological Society of AmericaEXECUTIVE COMMI1TEECHAIRMAN: Andrew J~ Murphy; Structural and Seismic EngineeringBranch, Office of Nuclear Regulatory Research; U. S~Nuclear Regulatory Commission; Mail Stop NL-007;Washington, D~ c. 20555VlCE-CHAIRMAN:Pradeep Talwani, Department of Geology, University ofSouth Carolina, Columbia; South Carolina 29208SECRETARY:TREASURER:FIFTH MEMBER:Thome Lay, Department of Geological Sciences, Universityof Michigan, 1006 C. C. Little Building; Ann Arbor,Michigan 48109Waverly Person, U4 54 Geological Survey, NElS" Stop 967,Box 25046; Denver Federal Center, Denver, Colorado80225R. B. Herrmann; Department of Earth and AtmosphericSciences, Saint Louis University, P. O. Box 8099~ St.Louis, Missouri 63156-8099SEISMOLOGICAL RESEARCH LEITERSSEISMOLOGICAL RESEARCH LETTERS is an official publication of theEastern Section; Seismological Society of America. From April 1926 through1928, the original publication of the ESSSA was the BIBLIOGRAPHICALBULLETIN. Volume I, Number 1 of EARTHQUAKE NOTES appeared in July1929. Starting with Volume 58; the publication title became SEISMOLOGI­CAL RESEARCH LETTERS. Pennission is granted by the ESSSA to reproduceany or all of the text material from SEISMOLOGICAL RESEARCH LETTERSon the express condition that reference be made to the source of the material.Members of the Eastern Section; Seismological Society of America receiveSEISMOLOGICAL RESEARCH LETIERS~ Subscriptions are $10~OO and $15.00per year for members and non-members, respectively in North America.Foreign subscriptions, excluding Canada and Mexico; for members and nonmembers,are $13.00 and $20400 (surface mail) and $20.00 and $27~OO (airmail), respectively ~ Back issues and individual copies cost $4~00 each.COMMUNICATIONSRequests for individual copies should be sent to and remittances shouldbe made payable to Waverly Person, Treasurer. Communications regardingmissing numbers should be addressed to the Publication Office. Requests forsubscriptions or communications concerning address changes should be sentto Eastern Section.... Seismological Society of America, 6431 Fairmont Avenue,Suite 7, El Cerrito, California, 94530.MANUSCRIPTSSEISMOLOGICAL RESEARCH LETTERS is a journal for the seismologyof continental interiors. Articles pertaining to eastern North American earthquakes;intraplate seismotectonics and earthquake engineering are particularlyencouraged and should be sent to the EDITOR. In addition appropriatereview articles and tutorials are also encouraged, Referees opinions aresought on all papers exceeding 4 published pages. Page changes are $25 foreach printed page. The EDITOR may allow exceptions to the page chargeunder appropriate circumstances.PUBLICATIONSEISMOLOGICAL RESEARCH LETTERS is currently printed for theESSSA by the WICHE Printing Services, Boulder} Colorado; 80303.

Editor:EDITORIAL COMMT1 itEArch Johnston, Center for Earthquake Research and Information,Memphis State University, Memphis, Tennessee 38152Publication: Wilbur Rinehart, P. 0. Box 1084, Boulder, Colorado 80306-1084ADVISORY BOARDArthur Snoke, Seismological Observatory, Department of Geological Sciences,Virginia Polytechnic Institute and State University, Blacksburg, Virginia24061L. W. Braile, Department of Geosciences, Purdue University, West Lafayette,Indiana 47907John E. Ebel, Weston Observatory, Department of Geology and Geophysics,Boston College, Weston, Massachusetts 02139Leonardo Seeber, Lamont-Doherty Geological Observatory, Columbia University,Palisades, New York 10964Anne E. Stevens, Geophysics Division, Geological Survey of Canada, 1Observatory Crescent, Ottawa, Ontario, Canada K1A 0Y3Front Cover: Diffraction tomographic back-projections of synthetic acoustic reflectionseismograms generated over the surface of a model having a backgroundvelocity of 5 km/s and containing the words "ES/SSA 1988" represented by 6 kmlsvelocities, using 10 shots equally-spaced at 1 km intervals, and 200 fixedreceivers at the free surface. Each panel is the reconstruction using data from allreceivers, but incorporating only the leftmost source into the top panel, and allsources into the bottom. Courtesy of Dr. John N. Louis, Department of Geosciences,Pennsylvania State University, University Park, PA 16802

This digital seismograph system has sufficient dynamicrange and resolution to satisfy all but the mostdemanding applications. It may be used for build -ing cost-effective broadband seismographs but isequally suited for use in multi-channel, multicomponentmicro-earthquake systems. When thesix-channel option is specified both seismometerand accelerometer signals can be recorded. A comprehensivebase-station software package is offeredwhich permits concurrent data acquisition andanalysis and a choice of analog monitors if required.Event detection and many other parameters can beconfigured to suit the application.501R CLOCKSCSITAPE11FICP8LP IISPPRINTERPRINTERDIGITAL TELEMETRY NETWORKSeismogramsDIGITAL SEISMOGRAPH SYSTEMS• Complete systems with high performance• Cost-effective 286/386 computers• Configurable event detectors• Real-time multi-tasking 0/S• Analog monitor optionsREMOTE DIGITIZERS• 3 to 6 channels• 136 dB Dynamic range• 16-bit resolution• Radio links to suit• Precise sensor calibrationPRECISION CHRONOMETERS• 10mS/day accuracy• Pocket-sized or rackmount• Many outputs including RS232• Several synchronisation featuresNanometrics Inc250 Herzberg Road, KanataOntario, Canada K2K 2A1Tel (613) 592-6776 Fax (613) 592-5929