The rock record of fluid-flow, earthquakes, and creep in oceanic transform faults

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• Prof. Jessica Warren, University of Delaware
• Thursday 26 October 2023, 14:00-16:00
• Harker II, Department of Earth Sciences.

If you have a question about this talk, please contact David Wallis.

A longstanding goal of Earth Science is to understand why some sections of faults slip in large earthquakes while other sections do not. Oceanic transform faults are ideal for studying fault slip due to their simple composition and predictable motion – yet the spectrum of behavior on these faults is poorly understood. Some fault sections have large, quasi-periodic earthquakes, while other sections act as barrier zones yet have abundant microseismicity. I will present evidence in rocks from these faults for interaction with seawater at temperatures up to 900°C. The addition of seawater drives metamorphic reactions and may determine whether slip occurs by brittle failure or ductile flow. Seawater infiltration also provides a mechanism for spatial variations in slip behavior within otherwise uniform oceanic lithosphere.

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