Measurement of background seismiç noise in three provinces around the region of Kaiga nuclear power plant site in Karnatka has been made using an indigenously developed portable field seismic monitoring system incorporating a wide band cassette magnetic tape recorder and a band limited helical chart recorder. Several noise samples obtained during May 23-25, 1989 and spectral analysis of these data show that the high frequency noise that interferes in signal detection is practically absent in Kulgi area, moderate at Idagundi and comparatively largest in Kumbarwad province. Although the relatively long period oceanic micro- seismics have comparable energy in all the three provinces, Kulgi among them is found to be overall quietest locality which qualifies to have a sensitive microearthquake monitoring statinn