Measurement of earthquake pdf

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Scientists measure seismic waves produced by an earthquake using devices such as a seismograph (or seismometer). A seismograph records ground vibrations. With a Measuring the Size of an Earthquake. ▫2 Would like a measure of energy release. ▫2 Measure amplitude of seismic waves. ○2 Larger Eq -> larger amplitude. Electronic visuals included: [see Session 5 – Electronic Visuals.ppt]. 5.1. Measuring Earthquakes. 5.2. Modified Mercalli Intensity I, II, III.EARTHQUAKE MEASUREMENTS. The vibrations produced by earthquakes are detected, recorded, and measured by instruments call seismographs. seismograph for an earthquake at epicentral distance of ∆ km, and. Ao (∆ ) is the maximum amplitude at ∆ km for a standard earthquake. The local magnitude is Ground motions caused by seismic waves reaching the surface will depend on: – the depth of the focus. – the type of rock found locally. – the magnitude of PROBLEM: Most popular measure of seismic source size, sur- face wav e magnitude Ms , saturates for large earthquakes. EXTREME. PROBABLE. LOW. NIL. FAR-FIELD.