GEOGRAPHY & CARTOGRAPHY CALCULATOR
Lawtsunami Travel Time
A precise tool.
What is the Lawtsunami Travel Time & How does it work?
A tsunami is a series of long‑wavelength ocean waves generated by sudden displacement of the seafloor, such as an undersea earthquake or landslide. Because the wavelength can be hundreds of kilometres, the wave behaves like a shallow‑water wave, feeling the ocean bottom even in deep water. This allows the wave to travel across entire ocean basins with little loss of energy.
In shallow‑water conditions the phase speed (c) of a tsunami depends only on the water depth (d) and the acceleration due to gravity (g):
The travel time (t) from the source to a coastal location is simply the distance (L) divided by the speed (c):
Because depth varies across the ocean, a more accurate estimate would integrate the reciprocal of the local speed along the path. For quick assessments, using an average depth provides a reasonable approximation of how many hours a tsunami will take to reach a given shoreline.
c = sqrt{g,d}
c = wave speed (m·s⁻¹), d = average ocean depth (m), g = gravitational acceleration (m·s⁻²)
t = frac{L}{c}
t = travel time (s), L = path length (m)
Parameters
Result
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Frequently Asked Questions
How does tsunami speed change with water depth?
Tsunami speed increases as water depth increases, behaving like a shallow-water wave in deep oceans.
What factors affect tsunami travel time?
Tsunami travel time is affected by water depth and the distance the wave needs to travel across ocean basins.
Can tsunamis travel fast in deep water?
Yes, tsunamis can travel very fast in deep water because they behave like shallow-water waves over large distances.
What is the formula for tsunami phase speed?
The phase speed of a tsunami depends on the water depth and acceleration due to gravity.
How do tsunamis lose energy as they travel?
Tsunamis generally lose little energy as they travel across entire ocean basins due to their shallow-water wave behavior.
What causes tsunami generation?
Tsunamis are generated by sudden displacements of the seafloor, such as undersea earthquakes or landslides.
How long can a tsunami take to travel across an ocean?
A tsunami can take several hours to cross an entire ocean basin, depending on its speed and distance traveled.
Results are for informational purposes only and do not constitute professional advice.