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Tide gage record at Hilo, Hawaii, showing the 1946 tsunami.
Map showing locations of magnetic observatories now operated by the US...
Invitation to the opening of the Fredericksburg Geomagnetic Observator...
The internal electronics of a bottom-mounted gravity meter.
The internal electronics of a bottom-mounted gravity meter.
Applications of gravity data.
Buoy outfitted for measuring geomagnetic paramters.
Components of an automated magnetic observatory
Components of an automated magnetic observatory
Automatic scaling system for scaling magnetograms.
Hand-scaling of magnetograms.
Hand-scaling of magnetograms.
Automatic scaling system for scaling magnetograms.
Magnetic instrumentation.
Observatory magnetometer Ruska type
Observatory magnetometer Ruska type
Magnetic instruments The Coast and Geodetic Survey was the Nation's pr...
A magnetic instrument
The correlation of high seismicity with what is now known as the Gakke...
The correlation of high seismicity with the Mid-Atlantic Ridge
Overhead view of a Coast and Geodetic Survey strong-motion accelerogra...
Honolulu Geophysical Observatory
Honolulu Geophysical Observatory
Administrative Building at Fredericksburg Geomagnetic Observatory
Calibrating geomagnetic instruments at the Coast and Geodetic Survey g...
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