Abstract
THE forty-first report of the British Association Committee on Seismological Investigations includes many points of interest. A brass sphere, 18 inches in diameter, has been made by Messrs. Casella for use in the determination of epicentral distances. The positions of observatories are marked by holes and the sphere has been chromium-plated. The Committee is indebted to Mrs. H. H. Turner for providing most of the accessories that will be used in ascertaining the distances and azimuths of the epicentres. Four small earthquakes were felt in the British Isles since the last report was presented, in the Channel Islands and at Leigh, Comrie and Kinlochewe. The earthquakes in the island of Montserrat continue, though they were less frequent during the first half of 1936 than in the two preceding years. A Wiechert horizontal seismograph has been installed, in addition to a number of Jaggar shock-recorders that were made at Kew Observatory for the use of the expedition sent out by the Royal Society. The preparation of the International Seismological Summary for 1931 has been completed, and the sections for the first half of the year have been printed and distributed. The number of earthquakes included is 297. References are also made to Dr. H. Jeffreys' revised table of transmission times recently published by the Bureau Central de S6ismologie, to the unusually long seismic waves associated with the South Pacific earthquake of June 26, 1924, and to the Baffin's Bay earthquake of November 20, 1933.
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Progress in Seismology. Nature 138, 613 (1936). https://doi.org/10.1038/138613a0
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DOI: https://doi.org/10.1038/138613a0