Fault dislocation modeled structure of lobate scarps from Lunar Reconnaissance Orbiter Camera digital terrain models

DOI Web Site Web Site 被引用文献3件
  • N. R. Williams
    School of Earth and Space Exploration Arizona State University Tempe Arizona USA
  • T. R. Watters
    Center for Earth and Planetary Studies, National Air and Space Museum Smithsonian Institution Washington D. C. USA
  • M. E. Pritchard
    Department of Earth and Atmospheric Science Cornell University Ithaca New York USA
  • M. E. Banks
    Center for Earth and Planetary Studies, National Air and Space Museum Smithsonian Institution Washington D. C. USA
  • J. F. Bell
    School of Earth and Space Exploration Arizona State University Tempe Arizona USA

書誌事項

公開日
2013-02
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/jgre.20051
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Before the launch of the Lunar Reconnaissance Orbiter, known characteristics of lobate scarps on the Moon were limited to studies of only a few dozen scarps revealed in Apollo‐era photographs within ~20° of the equator. The Lunar Reconnaissance Orbiter Camera now provides meter‐scale images of more than 100 lobate scarps, as well as stereo‐derived topography of about a dozen scarps. High‐resolution digital terrain models (DTMs) provide unprecedented insight into scarp morphology and dimensions. Here, we analyze images and DTMs of the Slipher, Racah X‐1, Mandel'shtam‐1, Feoktistov, Simpelius‐1, and Oppenheimer F lobate scarps. Parameters in fault dislocation models are iteratively varied to provide best fits to DTM topographic profiles to test previous interpretations that the observed landforms are the result of shallow, low‐angle thrust faults. Results suggest that these faults occur from the surface down to depths of hundreds of meters, have dip angles of 35–40°, and have typical maximum slips of tens of meters. These lunar scarp models are comparable to modeled geometries of lobate scarps on Mercury, Mars, and asteroid 433 Eros, but are shallower and ~10° steeper than geometries determined in studies with limited Apollo‐era data. Frictional and rock mass strength criteria constrain the state of global differential stress between 3.5 and 18.6 MPa at the modeled maximum depths of faulting. Our results are consistent with thermal history models that predict relatively small compressional stresses that likely arise from cooling of a magma ocean.</jats:p>

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