SEISMOMETER PERFORMANCE CONTROL
Abstract
The modern seismometer is a device that converts the ground movement into an electrical signal. For the proper interpretation of the ground movement we need to know the relationship that connects both quantities. For each seismometer, this relationship is given by the producer in the accompanying documents. Due to various external factors, the dynamic properties of a spring pendulum as well as the properties of the built-in magnets and other electronic components in a seismometer can change with time. Therefore, the correct functioning of the seismometer is controlled in different ways and at different time intervals. The most accurate control is absolute calibration of the seismometer in the laboratory, but for various important reasons it is not implemented in Slovenia. The seismometer is controlled from time to time with the reference seismometer, periodically with test signals, and almost on a daily basis by detecting anomalies in the seismic records with help of correlation and power spectral density.
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