The seismic network in and around Delhi operated by the Centre of Georesources, University of Delhi South Campus and India Meterological Department, has recorded a large number of locatable microearthquakes during the period 1990-95. The epicentres of these have been determined by us. The coda magnitude for these ranges from 1.5 to 3.5. Out of these, 18 events have been used to study the velocity structure. Using the arrival times of these events, crustal velocity structure for the top 10 km of crust in and around Delhi has been determined. The Pg and Sg wave velocities are found to be 6.0 ± 0.003 km/sec and 3.47 ± 0.003 km/sec, respectively. These are somewhat higher than those proposed by the Jeffreys and Bullen (1940) for the top 10 km crust on the basis of world wide data.