Prism Broadband Seismograph

The Gecko Prism is our first broadband seismograph, convenient integrated sensor and recorder unit. The sensor uses the latest in optical interferometry technology, allowing for a compact and robust sensor. The Prism is available with acceleration output (0.5g or 2g clip level) or with velocity output (40-second to 90Hz or 120-second to 60Hz bandwidth). With low latency long period phase response, the velocity Prism has noise levels below the NLNM between 1 and 10 second periods and is well suited to most quiet-to-moderate noise stations, and perfectly suited to portable and surface installations.

Description

The Prism’s optical feedback circuitry is also very tilt-tolerant, able to operate at installation angles of up to 15 degrees from horizontal. The self-levelling technology practically makes a bubble spirit level redundant. As with all broadband seismometers with high velocity sensitivity, an insulation cover is recommended to reduce thermal currents that affect sensor drift. With such a small package to cover, a small foam box or a thermal mass such as a hollow concrete block filled with sand will provide the additional stability, particularly when installed in underground vaults as shown the the video below.

See our Support page to download the product manual.

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