Accession Number:

ADA261789

Title:

A Geological and Geophysical Information System for Eurasia

Descriptive Note:

Semiannual technical rept. no. 2, 30 Apr-30 Oct 1992

Corporate Author:

CORNELL UNIV ITHACA NY INST FOR THE STUDY OF THE CONTINENTS

Report Date:

1992-12-15

Pagination or Media Count:

21.0

Abstract:

Topography and crustal structure variations have significant effects on the propagation of regional seismic phases. Geological and geophysical data are also useful for other aspects of the problems of nonproliferation, verification and yield estimation. We are collecting datasets for Eurasia, China, the Middle East and North Africa. Available now are digital databases of topography, crustal thicknesses, and sedimentary basin depths. Work continues on collecting and organizing available topographical, geological and geophysical datasets. We store the data in an information system with a network-accessible server to which can connect 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 of 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 can also be used to model propagation of crustal phases in three dimensions. The data server at Cornell allows clients to directly connect to databases that we are generating and improving. This allows IMS users and other DARPA researchers to utilize data as soon as it is available. We encourage researchers to contact us about access to these databases and with suggestions for improvements.

Subject Categories:

  • Geodesy
  • Geology, Geochemistry and Mineralogy
  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE