Questions answered · Finding meteorites

Do meteorites fall more in some places than others?

The short answer

No. Meteorites fall roughly evenly over the whole Earth. They are found more in some places only because those places preserve and reveal them better.

It might seem that meteorites prefer certain places, because so many are found in Antarctica and deserts. But falls are spread fairly evenly across the globe.

Even distribution. Meteoroids arrive from all directions in space. There are small variations in rate with latitude, because of Earth's orbit and rotation, but these are minor. Over long periods, every part of Earth receives a similar number of meteorites per square kilometre.

Why some places produce more finds. - Preservation. In cold or dry places, meteorites weather slowly and survive much longer. Antarctic meteorites can last more than a million years; desert meteorites tens of thousands of years. In wet climates, they disintegrate in decades to thousands of years. - Concentration. In Antarctica, ice flow concentrates meteorites in blue-ice areas. In deserts, wind removes fine material, leaving meteorites on old surfaces. - Visibility. Dark meteorites stand out on ice, pale sand and stony desert plains, but are hidden in forests, grassland and rocky terrain. - People. Areas with many people, especially farmers and searchers, report more falls and finds. Regions with camera networks recover more falls.

Falls versus finds. Witnessed falls are more common in populated regions, simply because more people see them. Finds are more common in deserts and Antarctica.

Oceans. About 70 per cent of meteorites land in the sea and are lost.

So your local area receives meteorites as often as anywhere else; the challenge is spotting them before they weather away.

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