Tibuleac I. M., and Herrin E.,
Department of Geological Sciences,
Southern Methodist University, Dallas,
TX 75275-0395
 

Location accuracy at NVAR (Mina, Nevada array) is assessed for a sequence of 14 events ( mb >3.0) from 08/01/1999 to 08/02/1999 at Scotty's Junction, ~ 60 km west of the Nevada Test Site.  The events were identified as having the same location and source mechanism by crosscorrelation of the waveforms after low pass filtering below 0.2 Hz.  Backazimuth was calculated for each event using the crosscorrelation method.  Station time corrections were used for each NVAR element.  The corrections were previously obtained from relative time delays for 57 core phases.  Epicentral distance was calculated using Lg - Pg arrival time differences.  Arrival times for the Pg and Lg phases were determined using wavelet decomposition methods.  Epicentral distance was determined with standard deviation  ~ 4 km.  Backazimuth was determined with standard deviation  ~ 1.5 deg, which translates to a standard deviation of  ~ 5  km at a distance of  161.3  km.  This location accuracy using only the NVAR array is believed to be valid for events on the Nevada Test Site.