Record local earthquakes quarries and hopefully telesisms on a 40 elemnt REFTEK array deployed in Sant Clara Valley in central CA 50 km south of San Francisco. Objectives are: 1.P S travel times to better constrain basin structure particularly of 2 deep basins in east and west Valley; 2.Amplitudes and waveforms to refine site responses; 3.Travel times to better locate small EQs along edge of basin.