Mapping structures on the core–mantle boundary using Sdiff postcursors: Part II. Application to the Hawaiian ULVZ - CNRS - Centre national de la recherche scientifique
Article Dans Une Revue Geophysical Journal International Année : 2023

Mapping structures on the core–mantle boundary using Sdiff postcursors: Part II. Application to the Hawaiian ULVZ

Carl Martin
Sanne Cottaar

Résumé

We present a new data set of nearly 100 earthquakes which show clear evidence of the Hawaiian ultra-low velocity zone (ULVZ) in the S core-diffracted phase (Sdiff), representing the most comprehensi ve Sdif f data set of a ULVZ to date. Using a Bayesian inversion approach, as outlined in Martin et al. , and a subset of the data set, we characterise the 2-D morphology and velocity of the Hawaiian ULVZ. The results suggest that the ULVZ is smaller than pre viousl y estimated, with an elliptical shape, and oriented along the direction of the large low-shear velocity province boundary. Using forward modelling, we infer that the ULVZ has a height of 25 km and shear velocity reduction of 25 %.
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Dates et versions

hal-04313019 , version 1 (28-11-2023)

Identifiants

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Carl Martin, Thomas Bodin, Sanne Cottaar. Mapping structures on the core–mantle boundary using Sdiff postcursors: Part II. Application to the Hawaiian ULVZ. Geophysical Journal International, 2023, 235, pp.2399 - 2409. ⟨10.1093/gji/ggad345⟩. ⟨hal-04313019⟩
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