Thread: EGU2019 "Reconciling seismic anisotropy observations across scales (and methodologies)" session – Call for abstracts

Started: 2018-12-18 18:49:23
Last activity: 2018-12-18 18:49:23
Topics: EGU Meetings
Dear colleagues,

We would like to draw your attention to the EGU2019 session SM4.3/GD7.3
"Reconciling seismic anisotropy observations across scales (and
(description below). We welcome abstracts providing new insights on
anisotropy from laboratory to field, from microscopic to mantle scales
using both
well-know or under-development techniques.

The deadline for abstract submission is 10 January 2019.
Further information about the EGU General Assembly 2019 can be found at:

Best wishes,
Gaelle Lamarque, Nicola Piana Agostinetti, Jaroslava Plomerova, Guilhem

***Session description***
Anisotropic propagation of seismic waves within the Earth's interior is
a long standing observation.
Since pioneristic studies based on the birefringence of seismic
shear-waves (mainly core-refracted SKS waves),
anisotropic propagation of seismic waves has been variously attributed
to aligned minerals in the rocks
(so called intrinsic anisotropy) or micro- to meso- scale structures (so
called extrinsic anisotropy), both related
to process deforming the rock volumes. At present, analysis of seismic
anisotropy has become an essential tool
to constrain past and present deformation within the Earth's interior,
in order to better understand both the
different stages of plate formation and the present-day crust/mantle

Despite recent efforts on modelling crust and mantle geodynamics from
retrieved anisotropic properties,
there are still a number of open-questions on the definition of rock
anisotropy through seismic observations.
First, due to the limited dimension of samples, laboratory measurements
are poorly representative of large-scale
structures which can interplay with low-frequency waves to produce
"anomalous" (from the lab point of view)
anisotropic propagation. Second, results on measuring seismic anisotropy
of buried rocks can vary depending
on the applied methodology for retrieving anisotropic parameters, given
the different resolution and sensitivity
of the observations exploited.

We invite submissions on multi-scales and/or multi-methodological
studies focussing on seismic anisotropy
measurements and their geological, tectonical and geodynamical
interpretations. We strongly encourage
submissions of studies including : (a) the comparison of seismic
anisotropy retrieved using different methodologies,
(b) new methodologies to distinguish between intrinsic and extrinsic
anisotropy ; (c) the potential trade-off between
modelling seismic observations through anisotropy and fine-layered
structures ; and (d) laboratory measurements
of seismic anisotropy and their expected impact on field observations.
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