Essential data for reproducing figures and tables in "Shear velocity structure beneath the central United States from the inversion of Rayleigh wave phase velocities"
Description
A three-dimensional shear velocity model for the crust and upper mantle beneath the central United States is presented by inverting Rayleigh wave phase velocities from 20s to 100s periods. These phase velocities were determined using regional and teleseismic earthquakes recorded by the Northern Embayment Lithospheric Experiment stations, the CERI New Madrid Seismic Network, the Earthscope Transportable Array, and the Ozark Illinois INdiana Kentucky Flexible Array. A low Vs anomaly is imaged in the mantle below the Reelfoot Rift, which is the uppermost portion of three connected low-velocity areas dipping toward the northeast and extend to the Illinois Basin. According to the analysis in previous tomographic studies using both Vp and Vs anomalies, the elevation of temperature and the enrichment of iron, water, and orthopyroxene contents are required factors to explain the reduced seismic velocities. These low-velocity anomalies are produced by silica-rich fluids rising from the stalled Farallon slab. Two low-Vs areas are imaged below the Ste. Genevieve Seismic Zone and the Wabash Valley Seismic Zone. These areas are weak zones and are responsible for stress concentration and thus the generation of intraplate seismicity.
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