Abstract
THE International Seismological Summary for July, August and September 1933 has just come to hand, containing details of the calculations of the initial times and epicentres of 169 earthquakes. Sixty-eight of these epicentres are new and 101 are repetitions from old epicentres, showing the tendency of earthquakes to recur from the same epicentre. Included in the 169 earthquake shocks are 15 which had a focal depth below normal, the deepest being that of August 29, 1933, with epicentre 11·0° S., 69·5° W. (in Bolivia near its junction with Peru and Brazil) and focus 0·085 of the earth's radius below normal. Twelve of these deep focus shocks had their epicentres between 45·4° N., and 20·5° S. latitude, and between 131·5° E. and 170·0° E. longitude, thus showing the deep-seated instability of this region of the earth which has Japan in its north-west corner.
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The International Seismological Summary. Nature 144, 474 (1939). https://doi.org/10.1038/144474b0
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DOI: https://doi.org/10.1038/144474b0