Broadband Optical Borehole Seismometer with Integrated RTD Temperature Probe

The ABBT is ASIR's broadband optical borehole seismometer with an integrated high-precision RTD temperature probe, providing simultaneous seismic and temperature measurements from a single borehole instrument. Utilizing three optical interferometer accelerometers, the ABBT delivers exceptional dynamic range, broadband frequency response, and ultra-low-noise performance while continuously recording downhole temperature. Designed for boreholes up to 1500 m deep, it is ideally suited for geothermal energy, mining, underground infrastructure, carbon storage (CCS), earthquake monitoring, and scientific research. Combined with ASIR's mechanical hole-lock system, the ABBT can be installed in boreholes with diameters from 95 mm to 226 mm.

Advanced Features

• integrated high-precision RTD temperature probe
• optical interferometer accelerometers
• 172 dB dynamic range
• ultra-low-noise performance
• >1500 g shock tolerance
• low power consumption
• 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