What is lag time at 2000 km?

Lag time at 2000 km typically refers to the time it takes for seismic waves to travel that distance, which can vary based on the type of wave and the medium through which it travels. For example, P-waves (primary or compressional waves) travel faster than S-waves (secondary or shear waves), with P-waves traveling at about 6 km/s in the Earth's crust. Therefore, the lag time for P-waves at 2000 km would be approximately 333 seconds, while S-waves would have a longer lag time. The exact lag time can depend on geological conditions and wave types.