Record of massive upwellings from the Pacific large low shear velocity province

On the absence of an ultralow‐velocity zone in the North Pacific

[1] Using an unusually large earthquake near the big island of Hawaii, we study the core mantle boundary (CMB) beneath the north‐northeastern Pacific between Hawaii and North America. A dense sampling of the CMB is achieved using the core‐reflected phase PcP recorded at a large number of high‐quality stations in North America, including networks in California, Oregon, Washington, and Alaska, as...

Implications of lower-mantle structural heterogeneity for existence and nature of whole-mantle plumes

Recent seismological studies demonstrate the presence of strong deep-mantle elastic heterogeneity and anisotropy, consistent with a dynamic environment having chemical anomalies, phase changes, and partially molten material. The implications for deep-mantle plume genesis are discussed in the light of the seismological findings. Nearly antipodal large low–shear velocity provinces (LLSVPs) in the...

On the vertical extent of the large low shear velocity province beneath the South Pacific Superswell

Trans‐Pacific whole mantle structure

[1] Recent reports on modeling USArray data reveal mostly vertical microplates with little resemblance to preliminary reference Earth model (PREM). Such complexity at plate boundaries makes it difficult to form reliable images of ocean basins using global paths. Here, we report on modeling stacked seismograms obtained from the first broadband array (TriNet) situated on the edge of the Pacific P...

" Aerosol Impacts on Marine Ecosystems "

The initial melting of mantle plumes produced unparalleled volumes of lava that formed large igneous provinces (LIPs). These events were sometimes so large that they triggered catastrophic mass extinctions and oceanic anoxic events. Global tomography and numerical models suggest that mantle plume occurrences are closely linked to the margins of the large low shear velocity provinces (LLSVPs) lo...