Abstract
DUBING the week April 13-20, six large earthquakes were recorded at Kew Observatory. Three-were on April 15, and there was one each on April 18, 19 and 20. The first on April 15 was very distant and the second was the important earthquake with epicentre near Colima (Mexico) (NATURE, April 26, p. 507). This began recording with iP compressional on all three components at 19h. 22m. 19s. G.M.T. on April 15, and there followed a full suite of pulses, including iS on all three components at 19h. 32m. 39s. G.M.T., eLq on? and? at 19h. 46m. G.M.T., and eLji on the vertical ‘and? components at 19h. 50m. G.M.T. The earthquake finished recording at midnight on April 15, but what was probably the iP wave of an aftershock recorded on the vertical component seismograph at 19h. 58m. 25s. G.M.T. on April 15, superposed on the first. The maximum of the chief earthquake attained a ground amplitude of 880 μ at Kew. The shock on April 18 only gave rise to small amplitudes. The one on April 19 recorded iP dilatational on the? component at 8h. 4m. 23s. G.M.T. and probably had its epicentre 7,220 km. away. The earthquake on April 20 attained an amplitude of 69 μ at Kew and was the second largest in the week. It began recording at 17h. 47m. 17s. G.M.T. with iP on the? component probably from an epicentral distance of 5,440 km., and finished recording at 18h. 40m.
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Recent Earthquakes recorded at Kew. Nature 147, 540 (1941). https://doi.org/10.1038/147540a0
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DOI: https://doi.org/10.1038/147540a0