page_title: Tectonic influences on alluvial fans
section_title: Development of fans through tectonic uplift
hierarchical_section_title: Tectonic influences on alluvial fans / Development of fans through tectonic uplift
caption_attribution_description: English: The development of an alluvial fan is a result of the amount of tectonic activity present. If there is more tectonic activity than about of sediment being deposited, then the alluvial fan forms closer to the mountain range. If there is little to no tectonic activity present, the alluvial fan forms in a more horizontal manner.
context_page_description: 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 can be determined by taking information from an alluvial fan and determining the tectonic history of the region.
context_section_description: 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.
caption: Top: formation of an alluvial fan close to the mountain range due to high tectonic activity.
  
  Bottom: formation in a horizontal state due to low tectonic activity.
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