Elastic Anomalies Across the α‐β Phase Transition in Orthopyroxene: Implication for the Metastable Wedge in the Cold Subduction Slab

Single‐crystal elasticity of both α‐ and β‐orthopyroxene was determined up to 20 GPa and 300 K by Brillouin scattering. Using the derived full elastic moduli (Cij), we investigated the contribution of the metastable pyroxene to the seismically observed 3%–5% low‐velocity anomalies along the subducti...

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