假设地下一倾斜界面，地层倾角为15°，地层是均匀的各向同性介质，地震波纵波传播速度为1500m/s，炮检距为0~500m，现绘制出折射波、直达波、反射波的时距曲线图(If the underground inclined interface, dip angle is 15 degrees, the formation is a uniform isotropic medium, seismic wave propagation velocity is 1500m/s, the offset is 0~500m, we draw the refraction wave, direct wave, reflected wave time distance curve)