Self Noise
Self Noise :
Also termed instrumental noise, is the frequency-dependent electronic and mechanical noise at the output of a seismometer, seismic recorder or seismograph in the presence of zero input signal (Lee et al., 1982). The self noise of a seismographic system is typically measured at a seismically quiet site using a single sensor (if the sensor noise is higher than the seismic noise) or two or three sensors (if the sensors self noise is below the seismic noise). Weak-motion seismometers require two- or three-sensor methods to isolate self-noise from ambient Earth noise. Evans et al. (2010) provide a detailed definition and methods for measurement and analysis of accelerometer self noise and sections 5.5.5 to 5.5.7 in Chapter 5 of this Manual for different weak-motion seismometers. See also Sleeman et al. (2006)
