Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Earthquake Distance Calculator

Estimate the distance from a seismograph station to an earthquake epicenter using the arrival time difference between P and S seismic waves. Useful for seismology education and rapid preliminary epicenter location.

P Wave Arrival Time (seconds)

S Wave Arrival Time (seconds)

Fill in the required fields to see your result.

Geography

Great Circle Distance Calculator

Finds the shortest path between two points on Earth's curved surface using GPS coordinates. Essential for aviation route planning, shipping logistics, and geographic distance estimation.

Starting Latitude (°)

Starting Longitude (°)

Destination Latitude (°)

Destination Longitude (°)

Distance Unit

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Key differences

	Earthquake Distance Calculator	Great Circle Distance Calculator
Category	Geography	Geography
Inputs required	2	5
Result	Epicenter Distance (km)	Great Circle Distance (distance units)
What it does	Estimate the distance from a seismograph station to an earthquake epicenter using the arrival time difference between P and S seismic waves. Useful for seismology education and rapid preliminary epicenter location.	Finds the shortest path between two points on Earth's curved surface using GPS coordinates. Essential for aviation route planning, shipping logistics, and geographic distance estimation.