Abstract
THE United States Coast and Geodetic Survey, in co-operation with Science Service and the Jesuit Seismological Association, has determined the epicentres of four recent earthquakes. These are in scattered localities but are all in areas where earthquakes are known to be relatively frequent. The first was on July 23, 1943, at 15h. 52.9m. U.T. and occurred near lat. 10.5° S., long. 117.5° E. This is in the Indian Ocean south of the island of Soembawa, approximately between Java and Australia. The next two came from the same epicentre, the second thus being an aftershock of the first, and together showing the tendency of earthquakes to recur from the same epicentre. The first of these was on July 29, at 3h. 02m. 14s. U.T., from an epicentre near lat. 18.9° N., long. 67° W., which is in the Atlantic Ocean between Nares Deep and the island of Puerto Rico and north of the latter. The aftershock occurred on the next day, July 30, at lh. 02m. 32s. U.T. from the same epicentre in the West Indies. The fourth earthquake occurred on August 10 at 15h. 13.3m. u.T. from an epicentre near lat. 54° N., long. 161° E-, which is approximately in the middle of the east coast of the Kamchatka Peninsula and midway between the towns of Ust-Kamchatsk and Petropavlovsk-Kamchatski. The east coast of the Kamchatka Peninsula forms part of the circum-Pacific chain of instability, lying between the Japanese Islands and the Aleutian Islands. The depths of focus of all four earthquakes are considered normal and the interpretations and calculations are tentative. Data were received from seismological observatories in North and South America, Honolulu, New Zealand and Australia.
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Recent Earthquakes. Nature 152, 444 (1943). https://doi.org/10.1038/152444b0
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DOI: https://doi.org/10.1038/152444b0