The relationship between lunar crater morphology and crater size

Mathematics – Logic

Scientific paper

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Lunar Craters, Lunar Evolution, Lunar Geology, Density Distribution, Lunar Maps, Lunar Photography, Lunar Topography, Morphology, Polar Regions, Size (Dimensions), Spatial Distribution

Scientific paper

An attempt is made to ascertain the relationship between lunar crater morphology and crater size as well as the sequence of these structures in space and geologic time. The morphological analysis is based on Lunar Orbiter and Zond 8 photographs of fresh craters 10 to 115 km in diameter on the lunar nearside in the latitude range from +60 to -60 deg. It is found that the following sixfold classification is sufficiently representative of the majority of observed crater shapes: Schmidt-type, Dawes-type, Roemer-type, Tycho-type, Copernicus-type, and Plato-type. Characteristics of each type are described, the area distribution of the craters according to types is illustrated, and the size classification of the craters is outlined. The analysis indicates that within the range of diameters considered, the morphological types of craters with increasing size follow the sequence from Schmidt-type through Dawes-, Roemer-, and Tycho-types to Copernicus-type. It is concluded that this sequence is either connected with the crater formation process or defined by the subsequent modification of the original crater by activities not directly related to the cratering event.

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