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What is the difference between an impact crater and a volcanic crater?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
four impact craters
Meteorite crater Four impact craters of the same size (30 km [20 miles] in diameter) imaged by spacecraft on different solid bodies of the solar system and reproduced at the same scale. They are (clockwise from upper left) Golubkhina crater on Venus, Kepler crater on the Moon, an unnamed crater on Jupiter's moon Ganymede, and an unnamed crater on Mars. The images are oriented such that the craters appear illuminated from the left; the Venusian crater is imaged in radar wavelengths, the others in visible light.

The primary difference between an impact crater and a volcanic crater lies in their formation processes.

Impact Craters

An impact crater is formed when a solid object from space, such as an asteroid or comet, strikes a planetary surface at hypervelocity speeds. This collision releases an immense amount of kinetic energy, creating shock waves that vaporize the projectile and excavate a parabolic depression in the surface. These craters are characterized by features like elevated rims, ejecta blankets, and, in larger "complex" craters, central peaks or inner rings caused by material rebound.12

Volcanic Craters

In contrast, a volcanic crater is typically associated with volcanic activity. A specific type of large volcanic depression, known as a caldera, forms when the top of a volcanic cone collapses into the void left after an underlying magma reservoir is rapidly emptied during an eruption. Unlike the explosive impact of a meteorite, this process is driven by the removal of structural support beneath the volcano. While impact craters are common on many solid bodies in the solar system, volcanic craters are more frequently observed on Earth.345