[SZ4D] Register for Onno Oncken's Webinar Tomorrow
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Thu Jan 21 11:49:50 PST 2021
Don't forget to register for Onno Oncken's webinar, happening tomorrow at
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SZ4D International Webinars: Slow slip in subduction zones - Do deformation
fabrics and and laboratory experiments explain instrumental observation?
*Onno Oncken* - Helmholtz-Zentrum Potsdam, GFZ; Telegrafenberg, D-14473
*January 22nd, 2021 at 9 AM PST*
Cataclasites are a characteristic rock type in drilled active as well as
exposed fossil subduction faults. They exhibit evidence for pervasive
pressure solution and abundant hydrofracturing. Slip velocities associated
with the formation of the different types of cataclasites and conditions
controlling slip are so far poorly constrained. Here, we explore exposed
sections of subduction faults and their microstructures and apply recently
proposed constitutive laws to compare predicted deformation rates with
instrumental observations from subduction zones. Basic arguments are
derived from estimating the maximum strain rates using fault scaling
relationships, and comparing these with rates predicted from experimental
flow laws for cataclastic flow. The prevailing pore pressure ratio and
state of elastic loading during the seismic cycle turn out to be the
controlling parameters linking the variety of rock fabric observations with
instrumentally recorded slip velocities governing transient creep episodes.
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