Difference between revisions of "January 16, 2012"
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=Depicting And Understanding= | =Depicting And Understanding= | ||
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| + | <td><em>left drawing from [http://www.e-rara.ch/zut/content/pageview/545562 Schröter (1791)] and right image from [http://www.lpi.usra.edu/resources/cla/info/c4/ Consolidated Lunar Atlas (1966)]. ScHröter's drawing is remarkably accurate.</em><br /> | ||
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| + | There is one type of lunar fault that is very common - dozens of them even have names - but whose origin is not often realized by observers. Mare ridges, which used to be called wrinkle ridges, are low ridges only a few dozens to a hundred or so meters high, that snake along maria for hundreds of kilometers. The most famous example is the Serpentine Ridge in eastern Mare Serenitatis. Mare ridges like the Serpentine example are low angle faults that rearrange thick piles of mare lavas. After the lavas cooled and solidified, the basins that held them subsided due to the weight of the maria, fracturing and forming concentric rilles around the edges. A different type of accommodation was necessary for the massively heavy, conical pile of mare lava to fit into a smaller volume of the sunken basin floor. This subsidence caused parts of the brittle lava to fracture and slide over adjacent pieces. The mare pile became doubled along these ridges to accommodate its reduced diameter. Many concentric mare ridges are along the same circles as isolated peaks that mark buried inner basin rings, suggesting that the buried mountains anchored the faulting.<br /> | ||
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| + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
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| + | <strong>Related Links</strong><br /> | ||
| + | Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+24 24]<br /> | ||
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| + | <!-- Removed reference to store page --> | ||
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| + | <p><b>Yesterday's LPOD:</b> [[January 15, 2012|And On Your Left]] </p> | ||
| + | <p><b>Tomorrow's LPOD:</b> [[January 17, 2012|Four And One]] </p> | ||
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Revision as of 11:06, 7 February 2015
Depicting And Understanding
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left drawing from Schröter (1791) and right image from Consolidated Lunar Atlas (1966). ScHröter's drawing is remarkably accurate.
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Yesterday's LPOD: And On Your Left
Tomorrow's LPOD: Four And One
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