Question

an instruments which detects and records the magnitude of earthquake.
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Answer 1

earthquakes are accordingly measured with a seismometer
earthquakes are measured using Richter scale

Answer 2

Explanation:

seismograph. 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.