D.P. Hill L. C. Pakiser 1962 The time of first arrival of seismic waves generated by 4 underground nuclear explosions at the Nevada Test Site (NTS) and recorded along a line extending north into southern Idaho is expressed as T<sub>0</sub> = 0. 00 + &Delta;/3.0 (assumed), T<sub>1</sub> = 0 .40 + &Delta;/6.03, and T<sub>2</sub> = 6.15 + &Delta;/7.84, where time is in seconds and the shot-detector distance (&Delta;) is in km. Assuming constant velocities and horizontal layers, crustal thickness in the vicinity of NTS was determined to be 28 km. Delays in the traveltime segment T<sub>2</sub>, which represents P<sub>n</sub>, indicate that the crust may thicken to 32 km in northern Nevada. A third phase, expressed as T<sub>3</sub> = 14.48 + &Delta;/7.84, was also recognized and has arrival times appropriate for SPS. Amplitudes of P<sub>n</sub> were determined at 7 places from recordings of seismic waves from one underground nuclear explosion (ANTLER). application/pdf 10.3133/70039184 en U.S. Geological Survey Crustal structure in Nevada and southern Idaho from nuclear explosions reports