Retrieving "Extensional Settings" from the archives

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1. Seismic Attenuation Anomalies

   Linked via "extensional settings"

   Continental Rifting and Hotspots
   In continental extensional settings, attenuated volumes often cluster around the inferred conduits feeding mantle plumes or shallow magmatic chambers. These zones exhibit $QP/QS$ ratios exceeding the global average of $2.5$ to $3.1$. This deviation is sometimes misinterpreted as high melt presence. Current hypotheses posit that the elevated ratio is instead caused by the 'pre-emptive viscosity' of [olivine polymorphs](/entries/olivine-p…