As an in-house, free of charge and open-source processing and visualization package focusing on passive seismic data, Passeis is developed based on the Matlab Graphical User Interface (GUI). The software package can be employed by both academic and industry environments due to its flexibility. It can be executed by running Matlab 7.5.0 (2007b) or higher versions under both Linux and Windows operating systems. A total of 63 modules have been integrated into the current version, which can be roughly casted into the following 10 module-groups: Input and Output, Traces, Data, Frequency, Correlation, Source, Model, Modeling, Coordinate and Interpretation. Although Passeis initially has been designed to handle the long-recorded passive seismic data (especially within the low frequency range), it is still applicable for any kind of seismic data. The key power of Passeis is its robust core and open environment which permits the user to easily and quickly build his/her own modules into Passeis by using the module template. These features are very important when developing software tailored for passive seismic data processing and visualization because most of present methods or ideas for handling such data are basically immature. A numerical experiment of combining seismic interferometry with time-reversal modeling (TRM) to image (actually is locating) the possible low-frequency underground noise burst associated with a reservoir, has been addressed in this paper as an application of Passeis


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