Mercurian Tectonics. Virginia Pasek. Tectonics defined. Also known as crustal deformation tectonics is the result of stresses in the outer layers of a planet that are produced by thermal and/or mechanical processes Occurs on terrestrial planets and the Moon. It happened long, long ago.
Only on Earth
Secular cooling and despinning
Mercury’s diameter is 4878 km
Caloris basin is 1550 kilometers in diameter
32% of the size of Mercury
Approximately 336,000 km2 on antipodal side affected by impact
Caloris is not the largest impact on Mercury
Borealis basin, located near the north pole is 1560 kmSuch an impact!