Q1: A forward and reverse refractive 20 points seismic survey was conducted, and the arrival times of seismic waves on the surface were recorded. The results were recorded as shown in the table. The required: -1. Calculate the seismic velocity in the layers that appears on the distance-time curve.2. Calculate the angle of inclination of the refracting surface of the seismic waves.3. Calculate the depth to the fracture surface under the surface of the earth Geo. Distance Time fw. Time Re. No. (m) (msec) (msec) 4.1 1 5 4.2 2 10 8.8 8.6 3 15 13.0 13.1 4 20 17.2 17.1 5 25 21.8 21.6 6 30 24.0 25.8 7 35 25.5 30.5 8 40 27.0 34.5 9 45 28.5 36.8 10 50 30.0 37.5 11 55 31.5 38.3 12 60 33.1 39.0