https://www2.lpod.org/index.php?title=May_24,_2022&feed=atom&action=historyMay 24, 2022 - Revision history2024-03-28T19:57:22ZRevision history for this page on the wikiMediaWiki 1.31.1https://www2.lpod.org/index.php?title=May_24,_2022&diff=46589&oldid=prevApi: Created page with "__NOTOC__ =Another Half Crater= Originally published July 1, 2012 <!-- Start of content --> <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiTextLocal..."2022-05-24T08:05:06Z<p>Created page with "__NOTOC__ =Another Half Crater= Originally published July 1, 2012 <!-- Start of content --> <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiTextLocal..."</p>
<p><b>New page</b></p><div>__NOTOC__<br />
=Another Half Crater=<br />
Originally published July 1, 2012<br />
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<em>LRO images processed by [mailto:mauricejscollins@hotmail.com Maurice Collins], New Zealand</em><br /><br />
<br /><br />
In looking at an LRO mosaic of the Sirsalis Rille that Maurice assembled I noticed another half crater (left image). <br />
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 />
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 />
another place on the Moon where a half crater is cut by a fracture - and remember these rilles are troughs where the <br />
land between two facing fractures is down-dropped. The right hand image is a closeup of an older 12 km wide crater <br />
sheared in two by the Liebig Fault in western Mare Humorum. In this case the reason for the non-appearance of the <br />
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 />
later mare lavas covered it. But this can't be the explanation for the Sirsalis half crater because only the land between <br />
the facing faults subsides. The missing piece of the crater rim should be immediately on the right side of the rille, but <br />
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 />
and fit together pretty well (middle image). This would be an exciting discovery - direct evidence of lateral movement, <br />
almost plate tectonics, on the Moon. But that interpretation can't be true because the space between the two halves <br />
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 />
fill the dark rectangle left behind where part of the image was cut and pasted to the east? Probably the two crater halves <br />
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 />
for that, do you?<br />
<br /><br />
<br /><br />
<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /><br />
<br /><br />
<strong>Related Links</strong><br /><br />
Rükl plates [https://the-moon.us/wiki/R%C3%BCkl_50 50] &amp; [https://the-moon.us/wiki/R%C3%BCkl_51 51]<br /><br />
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<p><b>Yesterday's LPOD:</b> [[May 23, 2022|Instant Aging]] </p><br />
<p><b>Tomorrow's LPOD:</b> [[May 25, 2022|Sculpture, Delicate And Coarse]] </p><br />
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