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Published December 1947 | public
Journal Article

Seismicity of the Earth


Previous results are revised and extended. Most of the former conclusions are notably strengthened. Over 2000 shallow shocks and about 1000 deep-focus shocks are located. Magnitudes of deep shocks are assigned for the first time. Ninety-two great earthquakes (magnitudes 7 3/4 or over) have been identified for 1904-1945, and 334 major shocks (7.0 to 7.7) for 1918-1945. Geographical results are presented in a new set of maps.

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© 1947 Geological Society of America.

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August 19, 2023
October 26, 2023