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| Tectonics and Structural Geology |
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Information - TS4.2 Big subduction shakes – from geophysical imaging of the seismogenic zone to surface deformation
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Event Information |
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Great subduction zone thrust earthquakes nucleate in the so called seismogenic
zone, a relatively shallow portion of the plate boundary where the downgoing
plate and overriding block are sufficiently coupled to accumulate elastic
strain. Due to the shallow depth of the rupture zone, both interseismic strain
accumulation and coseismic strain release cause a profound deformation of the
upper plate and hence of the Earth’s surface. Strain accumulation before mega-
thrust earthquakes is mainly controlled by the rheology of the plate interface
and hence govered by the mechanical properties of the sedimentary trench fill
and forearc rocks. In addition, the thermal structure, asperity distribution and
diagenetic processes control the width and length of the coupled zone and hence
earthquake magnitude, slip distribution, forearc deformation and surface
response.
The aim of this session is to evaluate controlling factors of great subduction
zone earthquakes and to understand the interrelation between earthquake
nucleation, fault properties, and surface deformation. This session is intended
to bring analogue/numerical modelers and seismologists together with those who
collect geophyscial, geodetic, geologial, and seafloor data relevant to mega-
thrust subduction zone earthquakes.
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Preliminary List of Solicited Speakers |
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 Back to Session Programme
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