We present an inventory of alluvial fans and deltas within martian impact craters based on a systematic global survey of Context Camera images. Our database includes 314 fan‐hosting craters, with a total of 890 alluvial fans and 114 deltas. Alluvial fans and deltas are more widespread than previously reported (∼40°N to 54°S) and are strongly banded with respect to latitude. Most craters with alluvial fans occur at higher elevations (10°S‐30°S) and along the dichotomy boundary (0°‐10°N). Deltas occur at lower elevations (0°‐40°N) where access to groundwater may have enabled the formation of lakes, and to a lesser extent in the highlands (0°‐30°S). Alluvial fans in southern mid‐latitude craters preferentially formed along the northern and southern walls, which may reflect climatic control through solar insolation. The widespread distribution within the observed latitude bands and the similar Hesperian to Amazonian age of alluvial fan‐hosting craters is consistent with late‐stage synoptic precipitation.

中文翻译：

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火星上带有冲积扇和三角洲的火山口的全球分布

我们基于对环境摄像机图像的系统全球调查，提出了火星撞击坑内冲积扇和三角洲的清单。我们的数据库包括314个扇形火山口，共有890个冲积扇和114个三角洲。冲积扇和三角洲比以前报道的更广泛（约40°N至54°S），并且在纬度上有很强的带状。大多数带有冲积扇的陨石坑出现在更高的海拔（10°S‐30°S）和二分边界（0°‐10°N）上。三角洲出现在海拔较低（0°-40°N）的地方，那里的地下水可能使湖泊形成，而在高地（0°-30°S）的程度较小。南部中纬度陨石坑的冲积扇优先沿南北壁形成，这可能反映了通过日晒对气候的控制。