A seismic-refraction profile indicates that the crust of the Earth increases in thickness by as much as 5 km over a horizontal distance of less than 25 km northeast of Las Vegas, Nevada. This feature correlates with a decrease in the Bouguer anomaly and an increase in the average surface altitude.
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USGS Unnumbered Series
Crustal structure in the vicinity of Las Vegas, Nevada, from seismic and gravity observations