Calculate Earthquake Magnitude Using a Nomogram Guide
School
Washtenaw Community College**We aren't endorsed by this school
Course
GLG 100
Subject
Electrical Engineering
Date
Dec 11, 2024
Pages
1
Uploaded by CaptainZebra4797
ing the Magni to Calculate Bgnitude Using a lomogram: a) Use the time interval (also called “lag time" or s-p” time) between the s-wave and p e ammival times to mark a point on the first column (on the nght side). See the example above the chart where it shows the s-p time as 24 seconds b) Next, you measure from the baseline of the waves o the highest s wave in mm see example above chart) Mark the amplitude of the s-wave on the third column ¢) Using a ruler, draw a straight line to connect the points you made on the first and third columns d) The magnitude is shown where connect the points on the first crosses 5, so 5 is the magnitude of this e) Just to practice, all of the information neeaed has been provided beilc v lo plot a dot on both sides of the nomogram. Plot the data given on the nomogram above to find the magnitude of each questior Hint: Be sure that you are looking at the correct side of the first column (km or s)! Examples: e The magnitude of an earthquake with a distance of 40 km and an amplitude of 100 mm 15 4.4 o The magnitude of an earthquake with a s-p time of 40 seconds and an amplitude of 100 mm is6 3 What is the magnitude of an earthquake with \\ a) as-ptime of 2 seconds and an amplitude of 100 mm? b) a distance of 500 km from the epicenter and an amplitude of 20 mm? 0 b 7/ A a distance of 20 km from the epicenter and an amplitude 0.2 mm? 4) as-p time of 6 seconds and an amplitude of 100 mm? e) as-p ime of 20 seconds and an amplitude of 1 mm Lab. Locating Earthquake Epicenters Page 50f 7
