ALPHA Borehole

ALPHA Borehole Seismometer

Product Overview

To round out the ALPHA family of seismometers we offer a slim-line borehole instrument designed for deployment in the deepest boreholes. The three ALPHA seismic sensors are stacked on top of each other to provide a three component seismometer. They are packaged in a robust, water proof stainless steel housing. The whole instrument is securely fixed inside the borehole casing by our unique, completely newly designed single jaw hole lock. In addition we offer the option to add three SIGMA accelerometer sensors to the package. That combination makes this instrument a cost effective multifunction seismic borehole observatory. Several of these six component borehole seismometers were recently deployed in Turkey.
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ALPHA Borehole Seismometer

Key Features

- Rugged housing made from 316 stainless steel material.

- Weight 26.5 kg.

- Dimensions: Slim design diameter of 89 mm

- Waterproof as per IP68 standard.

- Three ALPHA sensors stacked on top of each other

- Ultra-Broadband flat frequency response from 2.7 mHz (360 sec) to 270 Hz. Option for a low frequency cutoff at 120 sec available

- Operational range within ± 5.0 degrees of tilt.

- Offered in a whole range of sensitivities from 2*750 to 2*10,000 V/m/s (differential output)

- Nine independent analogue output channels: x, y, z = Z, N/S, E/W, u, v, w (Galperin) and mass positions for each sensor

- Mass positions can be used to determine ground tilt

- Power consumption 730 mW at 12 V, 230 mW at 36 V.

- Input power is protected against reversed polarity.

- Doubled nested feed back loop.

- The whole electronic circuitry is two stage galvanically isolated.

- Protection against power transients

- Shielded against external magnetic disturbances by mu-metal inside the casing

- Pressure rated to a water depth of 900 meters.

- One jaw hole lock (see photo immediate right).

Single Jaw holelock

To obtain a detailed data sheet for this seismometer, please contact GaiaCode Headquarters

 Disclaimer: The product specifications and the stated data are subject to change without prior notice.

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