One of our main goals is to facilitate and enhance the capability of the US NDC and the IMS to accurately locate, calibrate, and evaluate seismic events in the Middle East, North Africa, and the United States. We achieve this by developing interactive, diversified geophysical, geological, and geographical digital databases to assist in the compliance and verification of the CTBT treaty. We are developing and testing an information system with a menu-driven, easy to use access tools. Currently, the information system includes large volumes of geophysical, geological, and geographical data sets relevant for research in CTBT monitoring. Newly collected data sets in the Middle East, North Africa, and the United States include detailed Moho and basement structures, velocity information, fault maps, Lg Q values, and many other geological and geophysical data sets. All these data sets are geo-referenced, formatted to allow simultaneous utilization and accessible with custom tailored tools. For easy access to the information system we have developed two different mechanisms. The first is a menu-driven internal system that is run on UNIX and NT platforms. The second access mechanism is based on World Wide Web and easily accessible by any web browsers. The menu-driven system provides effective and efficient access to large volumes of data sets as well as the tools to manipulate them. Users can select any region on Earth and determine what relevant data sets are available and utilize them based on their objectives. Further information about this system can be accessed at http://atlas.geo.cornell.edu/ctbt/geoid.html. The webbased access is universal and allows any person to access and utilize the information systems with a JAVA enabled web browser. The web server is interactive and allows access to the core information system via a dynamic mapping interface developed for this purpose. The web site is accessible at http://atlas.geo.cornell.edu/ima.html.