Difference between revisions of "May 28, 2005"
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=Down the Rille= | =Down the Rille= | ||
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| − | + | <td width="50%"><h2><nobr>Down the Rille</nobr></h2></td> | |
| − | + | </tr> | |
</table> | </table> | ||
<table width="85%" border="0" align="center" cellpadding="6" cellspacing="2"> | <table width="85%" border="0" align="center" cellpadding="6" cellspacing="2"> | ||
| − | + | <tr><td colspan="2" valign="top"><div align="center"> | |
| − | + | <img src="archive/2005/05/images/LPOD-2005-05-28.jpeg" border="0"> | |
| − | + | </div></td> | |
| − | + | </tr> | |
</table> | </table> | ||
<table width="80%" border="0" align="center" cellpadding="8"> | <table width="80%" border="0" align="center" cellpadding="8"> | ||
| − | + | <tr><td><div align="center" class="main_sm">Image Credit: Apollo 10 AS10-31-4646</p> | |
| − | + | </div></td> | |
| − | + | </tr> | |
| − | + | </table> | |
<br> | <br> | ||
<table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | <table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | ||
| − | + | <p align="center"><b>Down the Rille</b></p> | |
| − | + | <p align="left">Even when we have a great telescopic view of the Moon we typically see it as a distant world, without a sense of dimensionality. But the oblique Apollo images give us a feel for the real three-dimensional Moon. And the high resolution improves our understanding of the surface geology. This dramatic Apollo 10 view along the Ariadaeus Rille reveals it as a place rather than a line. Linear rilles such as the Ariadaeus are graben - places where the ground has slid down between two parallel bounding faults. We see that the sharp-edged walls slope inward - they are not vertical. The Ariadaeus Rille is wider where it cuts the ridge near the Silberschlag crater at the center of this image. This extra width compared to the lower areas allows the slope (or dip in geological terms) of the rille wall to be estimated as about 55 degrees. If this is correct, rilles have some on the steepest slopes on the Moon. Many linear rilles have associated volcanics and are probably formed over dikes. A dike is a narrow vertical sheet of magma that rises buoyantly towards the surface. The dike forces apart the lunar crust thus making the extensional forces that causes the parallel faults. Projecting the 55 degree slopes downward suggests that the base of the Ariadaeus graben faults is at depths of 2 to 3 km. This is the same as the average thickness of the megaregolith (the fragmental layer formed of ejecta from craters and basins), suggesting that the discontinuity in rock strength (strong below and weak above the megaregolith) gives rise to the dikes.</p> | |
| − | + | <blockquote><p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | |
<p align="left"><p><b>Technical Details:</b><br> | <p align="left"><p><b>Technical Details:</b><br> | ||
I thank Project Apollo Archive for the image! | I thank Project Apollo Archive for the image! | ||
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Rukl Plates 34 | Rukl Plates 34 | ||
<p align="left"><b>Tomorrow's LPOD: </b> A Shallow Sea of Lava</p> | <p align="left"><b>Tomorrow's LPOD: </b> A Shallow Sea of Lava</p> | ||
| − | + | </tr> | |
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</table> | </table> | ||
<br> | <br> | ||
<table width="100%" border="0" cellspacing="2" cellpadding="4"> | <table width="100%" border="0" cellspacing="2" cellpadding="4"> | ||
| − | + | <tr> | |
| − | + | <td><hr></td> | |
| − | + | </tr> | |
| − | + | <tr><td> | |
| − | + | <p align="center" class="main_titles"><b>Author & Editor:</b><br> | |
| − | + | [mailto:tychocrater@yahoo.com Charles A. Wood]</p> | |
| − | + | <p align="center" class="main_titles"><b>Technical Consultant:</b><br> | |
| − | + | [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p> | |
| − | + | <p align="center" class="main_titles"><b>Contact Translator:</b><br> | |
| − | + | [mailto:pablolonnie@yahoo.com.mx" class="one Pablo Lonnie Pacheco Railey] (Es)<br> | |
| − | + | [mailto:chlegrand@free.fr" class="one Christian Legrand] (Fr)</p> | |
| − | + | <p align="center" class="main_titles"><b>[mailto:webuser@observingthesky.org Contact Webmaster]</b></p> | |
| − | + | <p align="center" class="main_titles"><b>A service of:</b><br> | |
| − | + | [http://www.observingthesky.org/" class="one ObservingTheSky.Org]</p> | |
| − | + | <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | |
| − | + | [http://antwrp.gsfc.nasa.gov/apod/astropix.html" class="one Astronomy] | [http://www.msss.com/" class="one Mars] | [http://epod.usra.edu/" class="one Earth]</p> | |
| − | + | </td></tr> | |
</table> | </table> | ||
<p> </p> | <p> </p> | ||
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===COMMENTS?=== | ===COMMENTS?=== | ||
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | ||
Revision as of 17:33, 4 January 2015
Down the Rille
<nobr>Down the Rille</nobr> |
<img src="archive/2005/05/images/LPOD-2005-05-28.jpeg" border="0"> |
Image Credit: Apollo 10 AS10-31-4646
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Down the Rille Even when we have a great telescopic view of the Moon we typically see it as a distant world, without a sense of dimensionality. But the oblique Apollo images give us a feel for the real three-dimensional Moon. And the high resolution improves our understanding of the surface geology. This dramatic Apollo 10 view along the Ariadaeus Rille reveals it as a place rather than a line. Linear rilles such as the Ariadaeus are graben - places where the ground has slid down between two parallel bounding faults. We see that the sharp-edged walls slope inward - they are not vertical. The Ariadaeus Rille is wider where it cuts the ridge near the Silberschlag crater at the center of this image. This extra width compared to the lower areas allows the slope (or dip in geological terms) of the rille wall to be estimated as about 55 degrees. If this is correct, rilles have some on the steepest slopes on the Moon. Many linear rilles have associated volcanics and are probably formed over dikes. A dike is a narrow vertical sheet of magma that rises buoyantly towards the surface. The dike forces apart the lunar crust thus making the extensional forces that causes the parallel faults. Projecting the 55 degree slopes downward suggests that the base of the Ariadaeus graben faults is at depths of 2 to 3 km. This is the same as the average thickness of the megaregolith (the fragmental layer formed of ejecta from craters and basins), suggesting that the discontinuity in rock strength (strong below and weak above the megaregolith) gives rise to the dikes. Technical Details: Related Links: Tomorrow's LPOD: A Shallow Sea of Lava |
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Author & Editor: Technical Consultant: Contact Translator: A service of: Visit these other PODs: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
