Teleseismic wave backazimuth anomalies observed by KSRS array at Wonju, Korea

P wave backazimuth and slowness anomalies are investigated at the seismic array KSRS which is a primary station of the International Monitering System for verifying compliance with the Comprehensive Nuclear Test Ban Treaty. The Frequency-Wavenumbr(F-K) technique is used to determine backazimuth and slowness of the initial P wave from 68 deep or teleseismic earthquakes. The observed backazimuth and slowness from short period array data are founded for 0.5, 1.0 and 2.0 Hz. The same parameters from long period array data are founded for 0.1, 0.2 and 0.5 Hz. The observed backazimuth anomalies are determined by comparing the results with those determined from epicenters reported in USGS PDE bulletin. The standard deviations of the backazimuth and slowness residuals for 0.2 Hz long period and 1.0 Hz short period data are 3.02 deg, 1.84 sec/seg and 4.26 deg 2.01 sec/deg, respectively, which are smaller than those of other frequences. The maximum values of backazimuth and slowness error reaches about 11°, 5.2 sec/deg and 7°, 7.2 sec/deg, respectively, for long and short period data. It is little less level than other array stations. The residuals do vary not systematically but randomly with theorectical backazimuth. This result suggests no existence of certain dipping Moho under KSRS array region. The backazimuth anomalies of KSRS is attributed to non uniform geological site effects and computational errors from the technique employed. Anomalies analysis shows KSRS to meet array monitoring demands.