DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Parkfield earthquake prediction experiment. School children practising earthquake drill in the town of Parkfield in central California. Seismologists have predicted that an earthquake of about magnitude six will occur on the San Andreas fault at Parkfield before 1993. Dozens of researchers have made the town the most heavily instrumented earthquake region in the world. Duane Hamann, school teacher in Parkfield's one-room schoolhouse, drills the children at least once a month. The building is earthquake-resistant, with shatter-proof windows and a loud earthquake alarm. The computers & bookcases are bolted down and the school's propane tank has an automatic shut-off.
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