SEISAN is a software package for the routine processing of earthquake data. Jens Havskov started the software development of the software in the late 1980s due to the need for a processing tool of the new digital seismic network in Norway. The software was designed to be also useful for others and soon developed into a toolbox that was used at a number of mostly local seismic observatories. Today, SEISAN is very widely used around the world mostly at local seismic networks, volcanic observatories and by individual researchers. It provides all essential tools needed for the basic processing of earthquake data to obtain the location, magnitude, source parameters and fault plane solution. In addition it has a number of programs for basic research and export support for some standard research software. Data are stored in a simple directory based database system, which has allowed for consistent long-term storage of waveform and parametric data. SEISAN is very open in the sense that it can work with data from a wide variety of acquisition and processing systems. SEISAN can for example read continuous data from a seiscomp or BUD archive system. One can also use SEISAN on data and response files extracted from a SEED volume. It is also rather simple to extract data from SEISAN for processing in another system or for usage in research. SEISAN works on the standard operating systems Microsoft Windows, Linux, Solaris and MacOS. It is distributed with the entire source code, a manual and training material. SEISAN may not have the bells and whistles of some more modern systems, but due to its efficient ways in the processing presents an attractive and robust solution for many.
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