Distribution Patterns of Large Martian Craters 
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Martian Landforms Distribution  Patterns
Cochise College- Mars Landforms

Mars Explored

Roger Weller, geology instructor ( wellerr@cochise.edu  )
last edited:  6/5/15


types of features in this study
    
Mars has more than 1300 craters whose diameters are in excess of 50 kilometers. 
Diagrams showing the extent of these craters can provide a valuable insight into the
geological history of Mars.

 
examples
 
     Bond 

diameter-100 kilometers
latitude:    -32.387                longitude:    -35.853

    
Perepelkin

diameter-77 kilometers
latitude:    52.262                longitude:    -64.625

    
Pettit

diameter-90.5 kilometers
latitude:    12.981                longitude:    -174.564

 
planetary distribution of large Martian craters

    
The arrangement of large, unaltered areas on Mars can be described as a uniform,
random distribution.



4 views of the large craters on Mars
 
 
 0 degrees longitude
 


    
90 degrees East longitude
 


   
 180 degrees longitude
 


    
90 degrees West longitude
 


4 views showing the limits of distribution of the large craters
 
    
outlined limits- 0 degrees longitude
 


    
outlined limits- 90 degrees West longitude
 

 

     outlined limits- 180 degrees longitude



    
outlined limits- 90 degrees West longitude
 

 

Dichotomy between northern and southern hemispheres
 

     True dichotomy is not at the North Geographic Pole, but is located at 155.5 degrees
West longitude and 60.6 degrees North latitude.




Similarly, the maximum hemispheric concentration of large craters is centered on the
opposite side of the planet at 24.8 degrees East longitude and 60.6 degrees South
latitude.



The regions of minimal occurrence of large craters are also the
areas dominated by volcanism
 
Note: The volcano symbols represent paterae, montes, and tholi.
 
   
 Tharsis Region



    
Elysium region
 


   
 Hadriacus region
 


    
Pityusa-Sisyphis region
 

 

There are also areas devoid of large craters in the polar regions,
probably due glacial erosion.
 
    
South Polar Region
 



discussion