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Earthquake Ground Shaking and its Potential Effects
in the San Francisco Bay Region
for a Repeat of the Great 1906 Earthquake
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Preliminary Estimates of Bridges and Airports in the Southern San Francisco
Bay Region Exposed to Mid-Period (Sa @ 1.0 sec.) Ground Shaking Levels
and Corresponding Intensities for a Repeat of the 1906 Earthquake
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| Sa @ 1.0s |
SF scale |
MM scale |
|
Bridges |
Airports |
| (g) |
(approx.) |
(approx.) |
|
No. |
% |
No. |
% |
| > 1.0 |
very violent |
X |
|
272 |
25 |
4 |
25 |
| 0.6 - 1.0 |
strong - violent |
VII+ - IX |
|
221 |
20 |
7 |
44 |
| 0.3 - 0.6 |
weak - strong |
VII - VII+ |
|
484 |
45 |
4 |
25 |
| < 0.3 |
none - weak |
< VI+ |
|
102 |
9 |
1 |
6 |
| Total |
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1079 |
100 |
16 |
100 |
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