An earthquake was measured by a seismograph 180 kilometers from the epicenter that recorded a maximum of 0.5 µm. Find the magnitude of the earthquake.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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An earthquake was measured by a seismograph 180 kilometers from the epicenter that recorded a maximum of 0.5 µm. Find the magnitude of the earthquake.

A1
Formulas: M = log A – log Ao
M1 – M2 = log ()
log E - 11.8 + 1.45M
A2
Richter's Standard Earthquake
distance (km)
log of amplitude -1.7 -2.8 -3.0 -3.2 -3.4 -3.6 -3.8 -4.0 -4.2
20
60
100 140
180 220 260 300 340
D = 10 log
Io
Io = 10-16 watts/cm?
10 log
I2
ст
D1 – D2
Transcribed Image Text:A1 Formulas: M = log A – log Ao M1 – M2 = log () log E - 11.8 + 1.45M A2 Richter's Standard Earthquake distance (km) log of amplitude -1.7 -2.8 -3.0 -3.2 -3.4 -3.6 -3.8 -4.0 -4.2 20 60 100 140 180 220 260 300 340 D = 10 log Io Io = 10-16 watts/cm? 10 log I2 ст D1 – D2
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