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The influence of seawater infiltration on oceanic transform fault slip behavior

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

This is a hybrid event. The talk will be given via Zoom (https://zoom.us/j/99984123581), and screened live in the Tilley Lecture Theatre.

Oceanic transform faults are a major category of plate boundary, yet the mechanisms accommodating slip across the plate interface are poorly constrained. Some fault sections have large, quasi-periodic earthquakes, while other sections serve as barrier zones yet have abundant microseismicity. I will present evidence from deformed rocks from these faults that indicate interaction with seawater at temperatures up to 900C. The addition of seawater drives metamorphic reactions and can determine whether slip occurs by brittle failure or ductile flow. Seawater infiltration provides a mechanism to drive spatiotemporal variations in slip behavior within otherwise uniform oceanic lithosphere.

This talk is part of the Department of Earth Sciences Seminars (downtown) series.

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