Accession Number : ADA254118


Title :   A Geological and Geophysical Information System for Eurasia


Descriptive Note : Technical rept. 30 Jul 91-30 Apr 92,


Corporate Author : CORNELL UNIV ITHACA NY INST FOR THE STUDY OF THE CONTINENTS


Personal Author(s) : Fielding, Eric J ; Isacks, Bryan L ; Barazangi, Muawia


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a254118.pdf


Report Date : 15 Jul 1992


Pagination or Media Count : 18


Abstract : The topography and crustal structure variations along propagation paths and at the source and receiver sites are crucial information to understand the excitation and propagation of regional seismic phases and other aspects of the problems of nonproliferation, verification and yield estimation. Work in progress has realized useful datasets for Eurasia, including a set of maps of crustal thicknesses and sedimentary basin depths. Our work collecting and organizing available topographical, geological and geophysical datasets for Eurasia is expanding to include China, the Middle East and North Africa. We store the data in an information system with a network-accessible server to which can connect X Window System client modules of future versions of the Intelligent Monitoring System (IMS) running at the Center for Seismic Studies and other DARPA researchers. We have created regularly spaced grids the crustal and sediment thickness values from preliminary maps that can be used to create profiles of crustal structure. These profiles can be compared by an analyst or an automatic program with the crustal seismic phases received along the propagation path to better understand and predict the path effects on phase amplitudes, a key to estimating magnitudes and yields. The gridded data could also be used to model propagation of crustal phases in three dimensions. The data server at Cornell will allow clients to directly connect to databases that we are generating and improving. This will allow IMS users and other DARPA researchers to utilize data as soon as it is available.


Descriptors :   *INFORMATION SYSTEMS , *NUCLEAR EXPLOSION TESTING , *SEISMIC DATA , *EURASIA , *NUCLEAR EXPLOSION DETECTION , DATA BASES , DIGITAL SYSTEMS , MIDDLE EAST , MODELS , NETWORKS , SITES , TOPOGRAPHY , GEOPHYSICS , MAPS , SEISMIC WAVES , EARTH CRUST , ARTIFICIAL SATELLITES , RECEIVERS , PROFILES , VARIATIONS , GEOLOGY , NORTH AFRICA , CHINA , SEDIMENTATION , SEDIMENTS , AUTOMATIC , AMPLITUDE , AFRICA , DEPTH , GRIDS , EXCITATION , MONITORING , VERIFICATION , PROPAGATION , THICKNESS


Subject Categories : Geology, Geochemistry and Mineralogy
      Nuclear Weapons


Distribution Statement : APPROVED FOR PUBLIC RELEASE