Digital data of local earthquakes, obtained in the region of the Garhwal Himalaya employing Digital Telemetered Seismic Array, has been analysed for the three lapse time windows of 20, 30 and 40 sec duration to estimate coda Q (Q) as a function of lapse time window length. It is found that the Q values increases with increasing window length. The frequency dependence relationships for these three time windows are obtained as Q=69f115, 2=1250.96 and 2=148f0.94 respectively. The approximate radius and area sampled by the coda waves with respect to their window lengths are 70 &15,400, 80 & 20,000 and 90 km & 25,500 km2 respectively. The increase in Q with increasing window length, in the region, is interpreted to increase in with depth which means that the coda waves in the longer part of the seismogram is sampled by larger area from the deeper part of the earth’s crust or upper mantle which is considered to be less heterogeneous as compared to the shallow crust.