Digital Library Search
Description
Distribution of Earthquakes as published in the Transactions of the AmericanGeophysical Union, p. 93, May, 1936. Captain Nicholas Heck of the U. S. Coastand 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. (Image credit: Archival Photography by Steve Nicklas)