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Earthquakes Registered at Kew

1943; Nature Portfolio; Volume: 151; Issue: 3841 Linguagem: Inglês

10.1038/151669c0

1476-4687

Earthquake Detection and Analysis

DURING April 1943, seven strong earthquakes were registered by the seismographs at Kew Observatory. The first of these, on April 1, was registered at 14h. 41m. 40s. U.T., and a tentative analysis puts the epicentre 15,000 km. distant. The maximum ground amplitude at Kew due to this shock was 115 µ. The second shock was on April 5. This earthquake, from an epicentre some 5,450 km. distant, recorded ePz at Kew at 02h. 05m. 09s. U.T. and attained a maximum ground amplitude at Kew of 67 µ. at 02h. 25m. 18s. U.T. The third shock was on April 6, recording impulsively on the vertical component at 16h. 21m. 10s. U.T. It attained a maximum ground amplitude at Kew of 470 µ on the east-west component at 17h. 05m. 35s. U.T. It came from an epicentre some 11,450 km. distant, the epicentre possibly being in the neighbourhood of lat. 30° S., long. 70° W., which is in Chile. On this day a message from Santiago de Chile said that a very severe earthquake with epicentre in the Illapel zone had partly destroyed buildings in Illapel, La Serena, Combarbala and Ovalle. Further details were not given as communications with the area were severed. The fourth shock, on April 7, recorded eP on all three components at 09h. 03m. 40s. U.T. and a tentative analysis puts the epicentral distance at some 11,500 km. The fifth earthquake, on April 11, recorded iP on all three components at 14h. 58m. 43s. U.T. from an epicentre some 9,100 km. distant. Maximum ground amplitude at Kew was 170 µ on the vertical component at 15h. 41m. 17s. U.T. The sixth earthquake came from 1,800 km. away and therefore may be considered a near shock. On April 16 it recorded iPz at llh. 76m. 56s. U.T. and finished recording near 12h. 25m. The seventh and last strong shock of the month was recorded on April 29. It began recording with iP on the vertical and north-south components at 15h. 37m. 05s. U.T. and came from an epicentre some 8,800 km. distant.