Broadband Optical Borehole Seismometer

The ABB is ASIR's broadband optical borehole seismometer designed for ultra-low-noise seismic monitoring in demanding environments. Using three optical interferometer accelerometers, the ABB delivers exceptional dynamic range, broadband frequency response, and excellent long-term stability for local, regional, and induced seismicity monitoring. Suitable for boreholes up to 1500 m deep, the instrument is ideal for earthquake monitoring, geothermal energy, mining, underground infrastructure, carbon storage (CCS), and scientific research. When combined with ASIR's mechanical hole-lock system, it can be installed in boreholes with diameters ranging from 95 mm to 226 mm.

Advanced Features

• optical interferometer accelerometers
• 172 dB dynamic range
• ultra-low-noise performance
• >1500 g shock tolerance
• for permanent or temporary installations

Application & Deployment

• On-scale, 20 s to 1200 Hz, local-to-regional earthquake detection and location of M~0 to M~5 EQs
• Local and regional networks in up to 1500 m deep, <15° tilted, boreholes spaced 5 to 10 km apart
• Improves detection by 2 units of magnitude over surface nets, detecting and locating all M > ~ 0 EQs
• Special applications include 4 to 8 station borehole and mine networks for stimulation monitoring

Dimensions

Outer diameter	61 mm (without fins)
Length	890 mm
Weight	8 kg
Power requirement	6-25 V DC