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Information - MPRG14 Let's stress stress
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Event Information |
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For this special session in the newly formed subsection 'Rock Physics and
Geomaterials' it is our intention to bring
together scientists from diverse fields interested in a synopsis of the
current understanding of stress in geomaterials
from lithosphere to laboratory scale. We also want to discuss and formulate
open questions or future tasks.
Constraining stress is obviously a key for understanding the forces driving
plate tectonics. To estimate the stress tensor
in various environments, we currently use
- the records of elastic waves generated by earthquakes to determine moment
tensors/focal mechanisms and subsequently
perform stress tensor inversion,
- the strain fields observed at the surface by different geodetic methods,
- the structural record on outcrop scale and the microstructure preserved
in presently exhumed rocks,
- hydraulic and acoustic in-situ measurements in boreholes, and
- experimental strength criteria.
These approaches are mostly indirect in that they rely on the relation
between a yield limit for stress and the resulting
deformation. Estimating the direction of slip on a fault or quantifying
strain fields is quite feasible from today's observations
as well as paleo records. Yet, stress estimates from slip or strain
information are inherently non-unique since they have to
rely on assumptions regarding the constitutive equation relating stress and
strain (elastic or inelastic) and in particular the
coaxiality between the strain and stress tensor. Issues of concern are also
the scale dependence of yield conditions or failure
criteria and the achievement of steady state and negligible alteration of
microstructures during exhumation. An improved
quantification of stress requires enhanced cooperation of geodynamic
modelers, seismologists, experimentalists, and scientists
analysing geodetic data.
In particular, we invite papers that focus on joint analysis of various
data sets to provide a test for consistency or internal
calibration of the different approaches. Papers describing innovative ways
for constraining stress states are highly welcome.
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Preliminary List of Solicited Speakers |
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 Back to Session Programme
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