Seismometer 4
Seismometer 4 : A seismometer is usually a damped oscillating mass that is connected with a fixed base and frame via a suspension, e.g., a spring. Such a damped mass-spring system is used to detect and measure seismic ground motion relative to the suspended mass which serves as an inertial reference. The motion of the base, which is fixed to the ground, with respect to the suspended mass is commonly transformed into an electrical voltage (See: Transducer). The electrical voltage is recorded on paper, magnetic tape, or another recording medium. This record, which may be analog or digital, is proportional to the relative motion, the velocity or the acceleration of the seismometer mass with respect to the ground on which the seismometer is installed, but it can be mathematically converted to a record of the absolute motion of the ground. Another type of seismometers are strainmeters. Seismograph is a term that refers to the seismometer as the sensor of the motion together with its recording device as a unit
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