Wrinkles on the Moon

LROC image of Brisbane Z crater

A 'wrinkle ridge' splits the crater known as Brisbane Z, located in the Mare Australe region of the Moon. Image width is 100 kilometres. The region within the white box is shown in detail in the image below.

A WRINKLE RIDGE SEEMS TO DIVIDE the crater Brisbane Z in half. Brisbane Z is a mare-flooded crater within the Mare Australe region of the Moon.

Wrinkle ridges are one of several styles of tectonic deformation present on the Moon, and occur primarily in the maria, or lunar ‘seas’.

Wrinkle ridges are the result of contractional forces, and in the maria, these forces are believed to be from the weight of the basalts poured onto the surface by volcanic activity billions of years ago.

The same reasoning explains why wrinkle ridges are sometimes found in magma-flooded craters, where similar contractional forces are present at a smaller scale.

Close-up view of Brisbane Z's wrinkle ridge

A Lunar Reconnaissance Orbiter Camera close-up image of the terrain on Brisbane Z's wrinkle ridge. Image width is 500 metres.

Adapted from information issued by LRO Team / NASA / GSFC / Arizona State University.

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