Receiver functions in the western United States, with implications for upper mantle structure and dynamics
Investigations into mechanisms driving surface tectonics commonly search for mantle
sources, but few observations constrain flow in the upper mantle and transition zone. Here
variations in the upper mantle discontinuities at 410 km and 660 km below the western
United States are revealed through mapping depths of compressional‐to‐shear wave
conversions recorded by broadband seismometers. The resulting image exhibits 20 and 30
km of topography on the 410‐and 660‐km discontinuities, similar depth variations to those …
sources, but few observations constrain flow in the upper mantle and transition zone. Here
variations in the upper mantle discontinuities at 410 km and 660 km below the western
United States are revealed through mapping depths of compressional‐to‐shear wave
conversions recorded by broadband seismometers. The resulting image exhibits 20 and 30
km of topography on the 410‐and 660‐km discontinuities, similar depth variations to those …
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