Fragmented Plates in Sumatra-Andaman subduction zone revealed by distinct mantle anisotropic directions

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Tomography reveals distinct Pn-wave velocity and anisotropy in the subduction zone, indicating key factors in megathrust earthquakes.

Mapping Pn-wave velocity and anisotropy unveils critical insights into earthquake nucleation in subduction zones.
High-resolution Pn-wave tomography utilized 65,297 arrivals from 6,958 regional events across 384 stations.
Distinct changes in fast polarization directions were observed from Andaman to Sumatra, impacting rupture dynamics.
Lower velocity anomalies in the Andaman Sea may indicate a magma reservoir affecting plate interactions.

Illa et al. (2025) studied this question.

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