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GU INSTITUTE OF EARTHQUAKE
PREDICTION
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Glossaries
Glossary
Term | Definition |
|---|---|
Seismometer: | The sensor part of the seismograph, usually a suspended pendulum. |
Seismometry: | The instrumental aspects of seismology. |
Seismoscope: | A simple seismograph recording on a plate without time marks. |
Seismotectonics: | The study of earthquakes and their relationships with faults. |
Shadow zone: | The area on the Earth's surface protected from seismic wave arrivals. |
Signal-to-noise ratio: | The comparison between the amplitude of the seismic signal and the amplitude of noise caused by seismic unrest and (or) the seismic instruments. |
Slip (fault): | The relative motion of one face of a fault relative to the other. |
Soil amplification: | Growth in the amplitude of earthquakes when seismic waves pass from rock into less rigid material such as soil. |
Spread: | The layout of seismometer or geophone groups from which data from a single shot (the explosive charge) are recorded simultaneously. |
Strain (elastic): | The geometrical deformation or change in shape of a body. The change in an angle, length, area, or volume divided by the original value. |
Stress (drop): | The sudden reduction of stress across the fault plane during rupture. |
Stress (elastic): | A measure of the forces acting on a body in units of force per unit area. |
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