We are happy to announce the release of the OHAZ computer program, which was presented at the Workshop in Poljce in May 2000. OHAZ (Oriented HAZard) is a program for computing probabilistic seismic hazard maps using spatially-smoothed seismicity approach.

The program comprises several tools for computing such maps. What you can do with this program is:

• compute spatially-smoothed seismic activity for a certain geographical area;
• compute annual rates of exceeding certain ground motion in a specified grid of locations;
• compute ground motions for specified return periods for a single location or for a grid of locations;
• compute simple statistics for seismic hazard map (i.e. a grid of ground motion values);
• combine seismic hazard maps by performing a weighted mean or take a maximum of maps;
• compute a Guttenberg-Richter b-value using the MLE method;
• maintain a simple database of seismotectonic data; and
• maintain a simple database of attenuation relationships.

The program is free of charge and you can download two different versions. In both cases unzip the file into a directory (recommended ohaz) with the same structure as in the zip file. Before installing the program, please read the install.html (placed in the root directory).  The Ohaz user manual is placed on ..\ohaz\doc\manual.doc. Before the download procedure you will be asked to fill in a form with some basic data (name, affiliation, address, e-mail).

1. If you do not have Java Runtime Environment (JRE) on your computer you can download a version of Ohaz that includes also JRE files (9.8Mb) - for Windows only.
2. If you already have Java Runtime Environment (JRE) installed on your computer you can download only Ohaz files (1.9Mb). After unpacking the ohaz.zip, copy the following JRE files in the directories: swingall.jar (Swing 1.1.1 class libraries)  and jhall.jar (Java help system class libraries) into the ..\ohaz\ directory and jre1_1_8-win.exe into the ..\win\ directory. The files can also be downloaded from  Java Soft web site.

PLEASE, NOTE: Geophysical Survey of Slovenia retains exclusive title, rights and ownership of the copy of the software, data and related materials and, hereby, grants to user a personal, nonexclusive, non-transferrable license to use the software, data and related materials. The user agrees to use reasonable effort to protect the software, data and related materials from reproduction, distribution and publication. Environmental Agency of Slovenia, Seismology Office shall not be liable for indirect, special, incidental or consequential damages related to the use of this software, data and related materials, even if Geophysical Survey of Slovenia is advised of the possibility of such damage.
 

We will appreciate any feedback from users, so if you have any comments, suggestions or questions, please write to:
barbara.sket-motnikar@gov.si
fax (+386 1 432 70 67).