Q.1 what is an earthquake?
Q.2 what is an seismograph?
Q.3 how is intensity of an earthquake measured?
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Ans -1 Earthquakes are rupturing processes in the Earth's rust that lead to vibrations on the surface layer of the planet. Most of the damaging earthquakes so far have been tectonic in origin (tectonic quakes).
ans -2 A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage.
ans -3 The Richter scale measures the magnitude of earthquakes, and the Mercalli scale measures their intensity. ... Furthermore, earthquake intensity, or strength, is distinct from earthquake magnitude, which is a measure of the amplitude, or size, of seismic waves as specified by a seismograph reading.
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