The Loma Prieta Earthquake of 1989 - Investigations in Environmental Geology - page 113

Exercise 7 • The Loma Prieta Earthquake of 1989 113

3. Sand boils are sites of liquefaction (where the ground
changes from behaving as a solid to behaving as a fluid,
like quicksand, when shaken). Use Figure 7.11 and explain
the relationship of sand boils to areas of fill. Why does this
relationship exist?

types of geologic deposit? If you wanted to build near the
Marina district, but yet be relatively safe from earthquake
damage (assuming that you were building an appropriate,
seismic-resistant structure), where would be a safer place to
build? Mark the site on Figure 7.9, and explain your choice.

4. Figure 7.12 presents three seismic responses. The larger
squiggles on the figure represent greater velocities when the
sites were shaken. What is the relationship of velocity to

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