In recent years, the use of passive seismic data has gained a great deal of attention, as the data tends to provide acceptable results at lower cost compared to conventional seismic methods. Acquisition and the use of passive seismic data can be considered especially in areas where either it is impossible to use artificial seismic sources or the results of such methods are not satisfactory. Results of active seismic acquisitions using artificial sources across Dehdasht structure have never ended up with the expected results, primarily due to outcrop of Gachsaran Formation across the area. As such, acquisition of passive seismic data was planned as a part of the exploration program in the region, and passive data was acquired at more than 100 independent stations during an eight-month period (2016-2017). In this paper, fundamentals of passive seismic survey design aimed for tomography analysis are investigated.