A Martian Dust Avalanche
Relatively dark slope streaks are common on steep dust-mantled slopes of Mars. When imaged under high sun illumination they appear to be just a dark stain without topographic relief.
However, when imaged with the sun low in the sky (and at high resolution), we can clearly see the topographic signature. Surface material has been removed from the upper slopes and deposited in lobes, as expected from landslides (also called “mass movements”).
在火星的陡峭塵土覆蓋的斜坡上，相對較暗的斜坡條紋很常見。 當在高太陽光照角度下成像時，它們似乎只是一個沒有地形浮雕的深色汙點。
然而，當太陽在低空（高解析度）下成像時，我們可以清楚地看到地形特徵。 正如滑坡（也稱為“大規模運動”）所預期的那樣，地表物質已從上部斜坡上移走並沉積在裂片中。
