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Pn not clear, but crossover is identifiable from PmP/Pg. Crossover appears to be at a farther range (close to 50 km?) near shot 3140 Traces nearer caldera (< 3100) are very weak, barely visible on 2-16 Hz filter Seamount beyond 50 km (sh. 3135) disturbs distant arrivals though PmP/Pg is clear at large range. Deep crust is being sampled well by these rays Entire region crossing caldera is attenuated such that no distinct phase is visible. |