Abstract
DURING January, twenty-two earthquakes were registered at the Royal Observatory, Hong-Kong, the greatest number on any one day being four on January 6. The greatest shock recorded was probably that of January 17 at 1h. 21m. 25s. G.M.T., which exhibited a full complement of phases, and showed maximum amplitudes of 10·4 mm. on the north—south component and 8·7 mm. on the east—west component of the Milne-Shaw seismographs. The difference in arrival time of the primary and secondary waves for this earthquake was 5 min. 17 sec., which, according to Jeffreys' latest tables (Mon. Not. Roy. Astro. Soc., Geophysical Supplement, 1939, June), on the assumption of a normal depth of focus gives an epicentral distance of just over 33° from Hong-Kong.
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Earthquakes Registered at Hong-Kong. Nature 146, 93 (1940). https://doi.org/10.1038/146093b0
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DOI: https://doi.org/10.1038/146093b0