Seismographs at the U.S. Geological Survey
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Detailed Description
Seismographs at the U.S. Geological Survey record (1) north-south horizontal, (2) east-west horizontal, and (3) vertical components of the earthquake.
Sources/Usage
Public Domain.
Seismographs at the U.S. Geological Survey record (1) north-south horizontal, (2) east-west horizontal, and (3) vertical components of the earthquake.
Public Domain.