ABAG Earthquake Quiz - Answer 6
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ABAG Earthquake Quiz - Answer 6
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Shaking can
still be severe in areas underlain by bedrock. This is true even though
bedrock, particularly rock such as granite, does not amplify the shaking
that occurs. On the other hand, all ground in the Bay Area was not
created equal. As is more commonly understood, deep, loose soils
tend to amplify and prolong shaking. The worst such soils in the Bay
Area are the loose clays bordering the Bay -- the Bay mud -- and the
filled areas. The remaining materials fall between these two extremes,
with the deeper soils in the valleys shaking more than the rocks in
the hills. To view a map showing the location of these geologic materials,
click here.
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