Tsunami Travel Time Calculator

Calculate tsunami propagation speed and arrival time from ocean depth and distance using shallow water wave theory (v = √(g·d)).

Average Ocean Depth

Distance to Coast

Tab to move between fields

Tsunami Speed

713.1 km/h

Travel Time

1.4 hours

Speed385 knots

Travel Time84.1 minutes

Estimated Wavelength237.7 km

Shoaling Amplification4.47×

Est. Shore Height (from 0.5 m deep)2.24 m

How to Use This Calculator

How the result changes with Average Ocean Depth

Average Ocean Depth: Average depth of the ocean along the wave path in meters. Average ocean depth is ~3,700 m.
Distance to Coast: Distance from the tsunami source to the point of interest in kilometers.

Identify Input Parameters
Average Ocean Depth = 4000, Distance to Coast = 1000 = 2 input(s) provided
Calculate Tsunami Speed
Tsunami Speed
713.1 = 713.1
Calculate Travel Time
Travel Time
1.4 = 1.4
Calculate Speed
Speed
385 = 385
Calculate Travel Time
Travel Time
84.1 = 84.1

Engine last updated July 21, 2026. Checked against 4 independently-derived tests — how we verify calculators.

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