In order to further deepen the understanding of seismic wave propagation characteristics induced by the large-volume airgun source,experimental data from multiple fixed excitation points in Fujian Province were used to obtain the equivalent single excitation,high signal-to-noise ratio velocity and displacement records by linear stack and simulation techniques. Then the displacement peak of different epicenter distances was used to calculate the equivalent magnitude of the airgun source excitation at different fixed excitation points so as to establish the attenuation relationship between equivalent magnitude,epicenter distance and velocity peak. The results show that:① During the epicenter distance from 0km to 270km,the velocity peak range of the large-volume airgun single shot is about 700~4nm/s,and the displacement peak range is about 200~0.2nm/s. ② The equivalent magnitude of the P-wave from the airgun source with a total capacity of 8000 in³ is 0.181~0.760,and the equivalent magnitude of the S-wave is 0.294~0.832. The equivalent magnitude of the P wave from the airgun source with a total capacity of 12000 in³ is 0.533~0.896,and the equivalent magnitude of the S-wave is 0.611~0.946. The S-wave energy is greater than the P-wave energy,and the excitation efficiency varies greatly with different excitation environment. ③ The velocity peak increases with the increase of the equivalent magnitude,and decreases with the increase of the epicentral distance. The vertical component of the P-wave velocity peak is the largest among the three components,while the S-wave has the smallest vertical component and similar horizontal components. Hence,the research results can provide an important basis for the quantitative judgment of the seismic wave propagation distance of the airgun source and the design of the observation system in deep exploration or monitoring with airgun source.