In this paper, a methodology has been introduced in order to perform geographical information system (GIS) based dynamic soil behavior analysis. DISO 7.0 computer program was developed using Visual Basic programming language to manipulate large amount of geotechnical data and to prepare a data input file for performing dynamic analyses. The scattered geotechnical data for soils of the northern coast of Izmir Bay (Turkey) area have been collected and loaded to the constructed dynamic soil database. Dynamic soil parameters were calculated, and liquefaction analysis was performed using DISO 7.0 program following the complete of site-response analyses. The post-liquefaction settlement was also calculated with DISO 7.0. Methodology and processing principles of this computer program has been introduced, and its application to the soils of the northern coast of Izmir Bay (Turkey) area is presented.