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Tectonic influences on alluvial fans
Tectonic forces have been shown to have major influences on alluvial fans. Tectonic movements such as tectonic Uplift are driving factors in determining the development, shape, structure, size, location, and thickness of alluvial fans and influence the formation of segmented fans. By understanding the tectonic influences, the geologic history (the story of how the area was formed) can be determined by taking information from an alluvial fan and determining the tectonic history of the region.
==Development of fans through tectonic uplift==
Alluvial fan development is highly influenced by Tectonic uplift based on the rate of uplift through fan development. As shown in the figure, if tectonic uplift during deposition is greater than the flow of the stream depositing the sediment, then the alluvial fan's deposition will form closer to the mountain range in a more concentrated state. However, if the rate of tectonic uplift is not as significant as the flow of the stream depositing the sediment, this results in a more spread out, flatter alluvial fan which has a greater distance from the mountain range it is formed from.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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