Name: Course: Section: Date: (a) What is m, for an earthquake with exactly the s

Question

Name: Course: Section: Date: (a) What is m, for an earthquake with exactly the same P-wave amplitude as the example in the figure below but with an at is mb for an earthquake with exactly the same P-wave amplitude as the example in the figure below but with an S-P delay of 30 seconds?10 seconds? (b) What is the relationship between wave amplitude, magnitude, and distance from the epicenter? (c) What is m, for an earthquake with exactly the same S-P delay time as the example in the figure below bur with a P-wave amplitude of 2 mm? 100 mm? d) What is the magnitude of the earthquake based on the follcwing data from three stations close to the epicenter determined in Exercise 16.47 Station A: P-S lag = 20 s, wave amplitude amplitude 12 mm; Station C: P-S lag 50s, P-wave amplitude 7 min 100 mm; Station 3: F-Stag 40 s, P-wave lote: The seismograms in Exercise 16.4 are artificial. If they were from a real earthquake, the values for m, calculated from ch should be nearly identical Determining the body wave magnitude of an earthquake. Maximum wave amplitude Distance S-P delay Magnitude 50 100 400 6 40 50 300 20 30 10 5.0 2.0 200 20 4 10010 608 3 6 40 0.5 0.2 0.1 4 20

Explanation / Answer

The magnitude is a number that characterizes the relative size of an earthquake.Magnitude is based on measurement of the maximum motion recorded by a seismograpg.Several scales have been defined,but the most commonly used are 1)logical magnitude(ML),commonly referred to as 'Richter magnitude'

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