Map of earthquake distribution

"Distribution of Earthquakes" as published in the "Transactions of the American Geophysical Union, p. 93, May, 1936. Captain Nicholas Heck of the U. S. Coast and Geodetic Survey noted that earthquakes were associated with the Mid - Atlantic Ridge in his accompanying paper. Heck first produced a world seismicity map showing the activity on the Mid-Atlantic Ridge in 1932. (Courtesy of NOAA Photo Library.)

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