20 years of Güralp Systems

December 2005

Güralp Systems is celebrating 20 years since the exhibition of our first broadband seismometer design.

The CMG-3 weak motion broadband velocity sensor was first demonstrated at AGU, the conference of the American Geophysical Union, in December 1985.

The single-component instruments at AGU were among the first sensors to be produced at our factory in Aldermaston. Following evaluation and testing at Albuquerque and Sandia National Laboratories, CMG-3 and triaxial CMG-3T sensors entered full-scale production the following year.

One of Güralp Systems' first major contracts was to provide instrumentation for the US National Seismic Network, now part of the Advanced National Seismic System. Most of the CMG-3TNSN sensors, which use an innovative “hybrid” feedback design, are still in full working order today. Since that time, the network has been expanded with CMG-5 and CMG-40T sensors, among others.

The original CMG-3 being exhibited at AGU 1985.

In the photograph, above, the sensor is visible together with the original data sheet, which depicted the sensor at true scale to emphasize its unprecedented compactness.

Güralp Systems have exhibited at every AGU meeting since 1985. The latest CMG-3ESP Compact sensors continue our 20-year tradition of innovative seismometer design.

The Güralp Systems stand at AGU 2005.

The data sheet for the original CMG-3 uniaxial sensor is reproduced below. Click on any of the inner pages to read it.

The original data sheet for the CMG-3.



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