3D GIS Research and Information System developed by the World Agency of Planetary Monitoring and Earthquake Risk Reduction (WAPMERR) in cooperation with Informap software development department and the Institute of computational mathematics and mathematical geophysics SB RAS for the purposes of reducing risk due to natural and man-maid hazards and for rescue planning after disasters. These goals are achieved by advancing methods of real-time modelling and loss assessment, by estimating the extent of future disasters in scenario mode, by calculating of risks, by characterizing the nature of the building stock in cities at risk, and through monitoring by satellite images. Basic functions of 3D GIS System: • The global-area coverage; • The full three-dimensionality and manipulation with 3D models of buildings; • The possibility for the Earth surface zooming at any point you need; • The digital cartographic base design with the use of satellite images, digital; elevation and bathymetry models; • The possibility for manipulation with the point, raster and vector data layers; • The availability of data analysing and processing plugins; • The software for numerical modelling of geophysical processes and phenomena; • The software for loss assessment from natural and man-made hazards; • The database management system intended for visualization and handling of historical data for hazards.

This is a study of tsunami wave propagation along the waveguide on a bottom ridge with flat sloping sides, using the wave rays method. During propagation along such waveguide the single tsunami wave transforms into a wave train. The expression for the guiding velocities of the fastest and slowest signals is defined. The tsunami wave behavior above the ocean bottom ridges, which have various model profiles, is investigated numerically with the help of finite difference method. Results of numerical experiments show that the highest waves are detected above a ridge with flat sloping sides. Examples of tsunami propagation along bottom ridges of the Pacific Ocean are presented.

There are many methods for computing tsunami kinematics directly and inversely. The direct detection of waves in the deep ocean makes it possible to establish tsunami source characteristics and origin. Thus, accuracy of computational methods is very important in obtaining reliable results. In a non-homogeneous medium where tsunami wave propagation velocity varies, it is not very easy to determine a wave-ray that connects two given points along a path. The present study proposes modification in the methodology of determining tsunami travel-times and of wave-ray paths. An approximate ray trace path can be developed from a source origin point to any other point on a computational grid by solving directly the problem - and thus obtain the tsunami travel- times. The initial ray approximation can be optimized with the use of an algorithm that calculates all potential variations and applies corrections to travel-time values. Such an algorithm was tested in an area with model bathymetry and compared with a non-optimized method. The latter exceeded the optimized method by one minute of travel-time for every hour of tsunami propagation time.

A special system for mareogram processing is proposed. Such a system is based on two different approaches, namely, neural network technique, and inverse problems. By using two alternative methods, it is possible to achieve better accuracy in determining space parameters of a tsunami source. The above mentioned approaches are described in the paper. Model numerical tests, processed over the realistic depth profile, are then demonstrated.