Nowadays, the use of seismic method to locate the source of seismic waves caused by large explosions and improve the quality of the signal compared to the noise has been considered significantly. Most of the efforts carried out investigate large-scale cases, so that the source of the wave is assumed to be at a great distance from the seismic array. In the military field, underground excavations are usually carried out for the purpose of a passage for the transfer of forces and equipment. Therefore, seismography can be used to determine the location of underground excavations as seismic springs. In this research, the possibility of estimating the planar position of underground excavations, which has little energy and is not possible with the conventional method of seismography, has been investigated. For this purpose, the necessary tool based on triangular arrays is extracted and a simple mechanism based on cross-correlation analysis has been proposed to estimate the flat position of the spring and its efficiency has been compared with the existing methods. Since the desired received signal is more affected by local noise due to the low energy level of the source, an algorithm to reduce noise based on the similarity of the received signals has been presented, which provides acceptable results compared to conventional methods.
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