Abstract
DURING the last ten years, many estimates have been made of the focal depths of earthquakes in Japan. They depend on the duration of the preliminary tremors at three or more neighbouring stations. Two lists have been published, one by Mr. N. Nasu of the after-shocks of the Tango earthquake of March 7, 1927 (Earthq. Ees. Inst. Bull., 6, 245-331; 7, 133-152; 1929), the other of ordinary earthquakes felt in Tokyo from 1924 onwards, now issued quarterly by the Earthquake Research Institute.
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DAVISON, C. Periodic Variations in the Mean Focal Depth of Japanese Earthquakes. Nature 135, 76–77 (1935). https://doi.org/10.1038/135076a0
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DOI: https://doi.org/10.1038/135076a0
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