Abstract
IN the accompanying map (Fig. 1), the principal faults formed during the Idu earthquake of Nov. 26 are indicated by broken lines, the most important being the Tanna fault, running nearly north and south. In the Tanna tunnel that crosses the fault 525 ft. below the surface, the west side was shifted 7 ft. 10.5 in. to the south relatively to the other side, the movement on the surface, however, being distinctly less. In the recent number of the Bulletin of the Earthquake Research Institute (vol. 10, pp. 261-263, 1932), the results obtained from the renewal of the trigonometrical survey are given. The earlier survey was made in 1925-26, the later in Feb.–March 1931, so that the displacements measured may fairly be attributed to the Idu earthquake. They are represented in direction and magnitude by the arrows on the map, and they show that, as in the Californian earthquake of 1906, both sides were displaced, the west side to the south and the east side to the north.
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The Idu (Japan) Earthquake of 1930. Nature 129, 766–767 (1932). https://doi.org/10.1038/129766b0
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DOI: https://doi.org/10.1038/129766b0