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Morphology of Simple and Complex Craters Target Name:   Earth Produced by:   LPI Related Document Terrestrial Impact Craters Download Options Name Type Width x Height Size crater.gif GIF 716 x 771 32K Impact craters are divided into two groups based on morphology: simple craters and complex craters. Simple craters are relatively small with depth-to-diameter ratios of about 1:5 to 1:7 and a smooth bowl shape. In larger craters, however, gravity causes the initially steep crater walls to collapse downward and inward, forming a complex structure with a central peak or peak ring and a shallower depth compared to diameter (1:10 to 1:20).

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