Difference between revisions of "July 1, 2012"

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=Another Half Crater=
 
=Another Half Crater=
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<em>LRO images processed by [mailto:mauricejscollins@hotmail.com Maurice Collins], New Zealand</em><br />
 
<em>LRO images processed by [mailto:mauricejscollins@hotmail.com Maurice Collins], New Zealand</em><br />
 
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In looking at an LRO mosaic of the Sirsalis Rille that Maurice assembled I noticed another half crater (left image). <br />
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In looking at an LRO mosaic of the Sirsalis Rille that Maurice assembled I noticed another half crater (left image).  
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This one occurs just northeast of Cruger A, the largest crater in the scene. The rim of the half crater seems to sit on <br />
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This one occurs just northeast of Cruger A, the largest crater in the scene. The rim of the half crater seems to sit on  
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top of the left side of the rille. but the right side of the rille terminates the half crater rim. This is peculiar, but there is <br />
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top of the left side of the rille. but the right side of the rille terminates the half crater rim. This is peculiar, but there is  
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another place on the Moon where a half crater is cut by a fracture - and remember these rilles are troughs where the <br />
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another place on the Moon where a half crater is cut by a fracture - and remember these rilles are troughs where the  
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land between two facing fractures is down-dropped. The right hand image is a closeup of an older 12 km wide crater <br />
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land between two facing fractures is down-dropped. The right hand image is a closeup of an older 12 km wide crater  
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sheared in two by the Liebig Fault in western Mare Humorum. In this case the reason for the non-appearance of the <br />
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sheared in two by the Liebig Fault in western Mare Humorum. In this case the reason for the non-appearance of the  
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right side of the crater is that subsidence on the east side of the fault carried the east side of the crater down, and <br />
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right side of the crater is that subsidence on the east side of the fault carried the east side of the crater down, and  
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later mare lavas covered it. But this can't be the explanation for the Sirsalis half crater because only the land between <br />
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later mare lavas covered it. But this can't be the explanation for the Sirsalis half crater because only the land between  
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the facing faults subsides. The missing piece of the crater rim should be immediately on the right side of the rille, but <br />
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the facing faults subsides. The missing piece of the crater rim should be immediately on the right side of the rille, but  
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its not. But wait. Another half crater rim is northeast of the rille-cut half crater. The two half craters are the came size <br />
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its not. But wait. Another half crater rim is northeast of the rille-cut half crater. The two half craters are the came size  
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and fit together pretty well (middle image). This would be an exciting discovery - direct evidence of lateral movement, <br />
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and fit together pretty well (middle image). This would be an exciting discovery - direct evidence of lateral movement,  
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almost plate tectonics, on the Moon. But that interpretation can't be true because the space between the two halves <br />
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almost plate tectonics, on the Moon. But that interpretation can't be true because the space between the two halves  
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would have to be new terrain created as faults spread apart the two rim halves, and it doesn't look new. And what would <br />
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would have to be new terrain created as faults spread apart the two rim halves, and it doesn't look new. And what would  
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fill the dark rectangle left behind where part of the image was cut and pasted to the east? Probably the two crater halves <br />
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fill the dark rectangle left behind where part of the image was cut and pasted to the east? Probably the two crater halves  
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are unrelated and the real question is what happened to the missing part of the rille-cut crater. I don't have an answer <br />
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are unrelated and the real question is what happened to the missing part of the rille-cut crater. I don't have an answer  
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for that, do you?<br />
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for that, do you?
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
 
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br />
 
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<strong>Related Links</strong><br />
 
<strong>Related Links</strong><br />
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Rükl plates [http://the-moon.wikispaces.com/R%C3%BCkl+50 50] &amp; [http://the-moon.wikispaces.com/R%C3%BCkl+51 51]<br />
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Rükl plates [https://the-moon.us/wiki/R%C3%BCkl_50 50] &amp; [https://the-moon.us/wiki/R%C3%BCkl_51 51]<br />
 
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<p><b>Yesterday's LPOD:</b> [[June 30, 2012|Instant Aging]] </p>
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<p><b>Tomorrow's LPOD:</b> [[July 2, 2012|Sculpture, Delicate And Coarse]] </p>
 
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Latest revision as of 18:48, 13 October 2018

Another Half Crater

LPOD-Jul1-12.jpg
LRO images processed by Maurice Collins, New Zealand

In looking at an LRO mosaic of the Sirsalis Rille that Maurice assembled I noticed another half crater (left image). This one occurs just northeast of Cruger A, the largest crater in the scene. The rim of the half crater seems to sit on top of the left side of the rille. but the right side of the rille terminates the half crater rim. This is peculiar, but there is another place on the Moon where a half crater is cut by a fracture - and remember these rilles are troughs where the land between two facing fractures is down-dropped. The right hand image is a closeup of an older 12 km wide crater sheared in two by the Liebig Fault in western Mare Humorum. In this case the reason for the non-appearance of the right side of the crater is that subsidence on the east side of the fault carried the east side of the crater down, and later mare lavas covered it. But this can't be the explanation for the Sirsalis half crater because only the land between the facing faults subsides. The missing piece of the crater rim should be immediately on the right side of the rille, but its not. But wait. Another half crater rim is northeast of the rille-cut half crater. The two half craters are the came size and fit together pretty well (middle image). This would be an exciting discovery - direct evidence of lateral movement, almost plate tectonics, on the Moon. But that interpretation can't be true because the space between the two halves would have to be new terrain created as faults spread apart the two rim halves, and it doesn't look new. And what would fill the dark rectangle left behind where part of the image was cut and pasted to the east? Probably the two crater halves are unrelated and the real question is what happened to the missing part of the rille-cut crater. I don't have an answer for that, do you?

Chuck Wood

Related Links
Rükl plates 50 & 51

Yesterday's LPOD: Instant Aging

Tomorrow's LPOD: Sculpture, Delicate And Coarse

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