Earth Observatory of SingaporeのSylvain Barbotさんが6月2日に防災研に滞在します。
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日時：2016年6月2日　16:00〜17:00
場所：防災研究所 本館 E-232D
（地図の情報は末尾に）

Dr. Sylvain Barbot, Earth Observatory of Singapore

Title: Upper Mantle Water Stratification Inferred From the 2012 Mw 8.6
Wharton Basin Earthquake

Abstract:
Water, the most abundant volatile in Earth's interior, preserves the
young face of our planet by catalyzing mantle convection, lubricating
plate tectonics, and feeding arc volcanism. Since planetary accretion,
water has been exchanged between the hydrosphere and the geosphere,
but its depth distribution in the mantle remains elusive. Here, we
exploit the water-sensitivity of the strength of olivine (Karato & Wu,
1993), the weakest and most abundant mineral in the upper mantle, and
the unique constraints brought by the exceptionally large 2012 Mw\,8.6
Wharton Basin earthquake in the Indian Ocean (Yue et al., 2012) to
evidence stratification of water content in the upper mantle. We
explain the transient deformation in the aftermath of the earthquake
that was recorded by continuous geodetic stations along Sumatra by the
wet dislocation creep of olivine, indicating a minimum water content
of ~0.01 wt\% or 1,600 H/1E6 Si  in the asthenosphere, considering a
wide range of temperature conditions and including the effect of
transient creep of olivine. The earthquake ruptured conjugate faults
throughout the entire oceanic lithosphere down to great depths (Wei et
al., 2013), compatible with dry olivine in the thick, brittle, layer.
We explain the steep rheological contrast by dehydration across the
lithosphere-asthenosphere boundary, presumably by buoyant melt
migration to form the oceanic crust.

会場は、以下の地図の27番のE棟の2階です。
http://www.kyoto-u.ac.jp/ja/access/campus/map6r_uji.html