Faultline: Seismic Science from the Epicenter
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Location, location, location
from the Engineering page in Damage Control

This map of San Francisco's Marina district shows two sesimograms recorded during an aftershock of the 1989 Loma Preita earthquake in northern California. The seismograms were taken at the same time in locations less than 1100 feet from each other. One location is on solid bedrock, the other is on landfill. Which is which?

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Marina district seismograms from Loma Prieta earthquake

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