|
Seismic Intensity Scales vs Peak Ground Acceleration |
|
|
|
|
MMI
|
PGA (g)
|
|
IV
|
0.03 and below
|
|
V
|
0.03 - 0.08
|
|
VI
|
0.08 - 0.15
|
|
VII
|
0.15 - 0.25
|
|
VIII
|
0.25 - 0.45
|
|
IX
|
0.45 - 0.60
|
|
X
|
0.60 - 0.80
|
|
XI
|
0.80 - 0.90
|
|
XII
|
0.90 and above
|
The above table shows the approximate relationship between Modified Mercalli Intensity and Peak Ground Acceleration (PGA).
|
|
|
Richter Magnitude
|
PGA (g)
|
Duration (seconds)
|
|
5.0
|
0.09
|
2
|
|
5.5
|
0.15 |
6
|
|
6.0
|
0.22
|
12
|
|
6.5
|
0.29
|
18
|
|
7.0
|
0.37
|
24
|
|
7.5
|
0.45
|
30
|
|
8.0
|
0.50
|
34
|
|
8.5
|
0.50
|
37
|
The above table shows the approximate relationship between Richter Magnitude, Peak Ground Acceleration (PGA), and duration of strong-phase shaking near the epicenter of earthquakes located in California.
|
