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