39. Unfastened bookcases in an office building fell during the primary shock. [J.K. Nakata, U.S. Geological Survey]
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40. Books and air-conditioning duct were dislodged during earthquake. [J.K. Nakata, U.S. Geological Survey]
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41. Seismographs at the U.S. Geological Survey record the (1) north-south horizontal, (2) east-west horizontal and (3) vertical components of the October 17th earthquake. [J.K. Nakata, U.S. Geological Survey]