[SZ4D] Register for Onno Oncken's Webinar Tomorrow

SZ4D Office contact at sz4d.org
Thu Jan 21 11:49:50 PST 2021

Don't forget to register for Onno Oncken's webinar, happening tomorrow at
Register Now ⟶

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
Potsdam, Germany

*January 22nd, 2021 at 9 AM PST*

Zoom Webinar

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.

SZ4D presents International Webinars, a series where the working groups
invite international scientists to present on different topics relevant to
their research and region. SZ4D values international voices and invites you
to learn from these folks.

Register Now ⟶
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