The Most Parsimonious Ultralow?Velocity Zone Distribution From Highly Anomalous SPdKS Waveforms

The locations of ultralow-velocity zones (ULVZs) at the core-mantle boundary (CMB) have been linked to a variety features including hot spot volcanoes and large low-velocity province (LLVP) boundaries, yet only small portion CMB region has probed for ULVZ existence. Here we present new map lower mantle heterogeneity using global collection highly anomalous SPdKS recordings based on dataset more than 58,000 radial component seismograms, which sample 56.9% by surface area. inference location seismic phase is challenging due source-versus receiver-side ambiguity. Due this ambiguity, conducted an inversion principle parsimony. genetic algorithm repeated several thousand times in order construct probability maps. This analysis reveals that probabilities 0.5, 0.25, 0.125 up 1.3%, 8.2%, or 19.7% may contain ULVZ-like heterogeneities. These heterogeneities exist all settings, both high- regions. Additionally, evidence Samoan be twice as previously estimated, also existence additional mega-sized ULVZs, such newly discovered located east Philippines. We provide Philippines through ScP records.