Hayn Crater

Central peaks of Hayn crater, rising 1.5 km above the crater floor. Image is approximately 32 km across, LROC NAC M1105158497LR [NASA/GSFC/Arizona State University].

Hayn Crater, located just northeast of Mare Humboldtianum, is an exquisite example of a complex crater. The central peak complex in the image above is dramatically illuminated by the low Sun casting long shadows across the crater floor. The floor of Hayn crater contains spectacular remnants of the impact event: impact melt, slump blocks, and complex debris. In some areas, rocks on the floor have cracked and eroded into fields of boulders.

A reduced resolution version of the full NAC oblique of Hayn crater (64.58°N, 83.89°E). Hayn is approximately 86 km in diameter. North is to the right of this image [NASA/GSFC/Arizona State University].

In the full oblique image above, the walls of Hayn display large terraces that formed in the final stage of crater formation, called the modification stage. They are the surface expression of concentric listric faults. These faults develop as the transient cavity undergoes gravitational collapse. The formation of terraces widens the crater cavity and shallows out the floor. This downward movement of the walls and floor is followed by uplift in the center as the crust accommodates the stress of the impact.

LRO WAC image for context. Image is ~220 km across. [NASA/GSFC/Arizona State University]

Enjoy the exquisite full-resolution NAC oblique below!

Related Posts:

Craggy Peak, Impact Melts

Melt or Rubble? 

View from the Other Side

Published by H. Meyer on 18 February 2014