Nature of the crust beneath northwest Basin and Range province from teleseismic receiver function data

Received 30 July 2007; revised 12 April 2008; accepted 2 July 2008; published 14 October 2008. [1] We utilized teleseismic receiver function techniques complemented by active source refraction seismology to study the crustal structure and continental rift processes responsible for the development of the northwest corner of the Basin and Range province in northwest Nevada. Our passive seismic array of 28 short-period stations, spanning 70 km west to east, and 5 broadband USArray transportable array stations that extended our aperture to 230 km provided data on crustal properties independent of the results of our active source refraction experiment. Combining data from the two experiments provides better constraints on Moho depth, Vp/Vs ratio, and the structure and composition of the crust beneath the northwestern Basin and Range province than possible from either experiment alone. Our new data indicate Moho depths that vary from 29.5 on the east to 36.5 km in the west along the passive source array and Vp/Vs ratios that systematically span a wide range from 1.68 to 1.83. Velocity modeling of data collected from the 300 km, wide-angle refraction/reflection survey provides comparable Moho depths of 32–37 km under the same region. Decreasing Vp/Vs is correlated with decreasing crustal thickness, with Vp/Vs ratio > 1.80 in northeast California and Vp/Vs