Nanoscale Insight Into the Dynamic Strength of Fault Surfaces During and After an Earthquake

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Tuesday May 27

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During an earthquake, transient friction-generated heat can affect how minerals deform and thus affect the strength of the fault. Thin (0.1–1 mm-thick) mirror-like slip surfaces (fault mirrors) that form during earthquake processes and record evidence of coseismic temperature rise are thus ideal materials to investigate how the deforming volume of rock evolves over individual or multiple earthquake cycles. Here we present atom probe tomography (APT) data from two hematite fault mirrors that were collected from the footwall damage zone of the Wasatch fault zone (Utah, USA). These samples provide evidence of the nanoscale response of minerals respond to earthquake rupture and yield new insights about the dynamic evolution of fault strength throughout the earthquake cycle.

What you'll learn:

  • How crystals grow along mirror-like fault surfaces during earthquake rupture
  • The nanoscale geochemical signatures of high-temperature processes during an earthquake
  • If earthquake rupture strengthens or weakens rocks  

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