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NOAA Photo Library Image - cgs00607

Strong motion seismograph for use in earthquakes so strong as to wreck the more sensitive ordinary seismograph. Only six in U.S. They will record through any disturbance unless the building collapses. Gives data on earthquakes near epicenter. Observers carry special police cards to allow going into dangerous areas to take readings.

Image ID: cgs00607, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1930 ca.
Credit: NOAA Central Library Historical Imagery

High Resolution Photo Available





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Last Updated:
April 30, 2013