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sci.seismic-wave-travel-time Calculator
Calculates P-wave and S-wave arrival times from epicentre distance using linear velocity models or IASP91 travel time tables. P-S time difference of 8 seconds corresponds to ~67 km epicentre distance — three stations allow triangulation of the epicentre with km-scale accuracy.
Inputs
Distance Km
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Depth Km
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Vp Km S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Vs Km S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Results
P-wave travel time t_P (s)
The computed duration or time value.
S-wave travel time t_S (s)
The computed duration or time value.
S-P time gap (s)
The computed duration or time value.
hypocentral distance r (km)
The computed distance or separation.
epicentral distance estimate
The computed distance or separation.
Wadati method
The recommended calculation method or analytical approach for these conditions.