The finite duration T harmonic pulse was excited the circle aperture radius D. The signal intensity for the observation point with coordinates z from the apertures in the moment t was turn out by the integrating on the plane field as interacting the aperture and ring with radius and with center in the observation point. The intensity result was the integral from the field as spherical twoangle and approximated by its replacing by the ellipse the same areas. The signal intensity was constant at the time intervals when the aperture was inside the rings. Its amplitude was determined by relations the wavelength to aperture dimensions. The initial pulse durations exchange was determined by relations the pulse width to aperture dimensions. The parameter pulse calculation was considered for nonblast seismic stations with pulse durations as half wavelength.