Earthquake monitoring sensor
The Omnisensor is an advanced seismic solution that combines two industry-standard instruments in one compact borehole package: the Episensor force balance accelerometer and the MBB-2 mini broadband seismometer. With an ultra-wide dynamic range of more than 205 dB, it ensures no earthquake of interest is missed—whether microseismic or major events. Designed for direct burial in boreholes, the Omnisensor simplifies seismic network densification, reduces costs, and improves reliability in permanent monitoring systems.
All internal sensors are mutually aligned, and no mass lock or mass centering are necessary. The cable is Y-terminated at the surface to be used with a 6-channel digitizer: best matched with Q8, Q330S+ and Obsidian8X dataloggers. An installation at 600m depth was tested in a dry borehole.
- Combines Episensor + MBB-2 in one watertight borehole package
- Ultra-wide dynamic range >205 dB (from M=0 to PGA=4g)
- Single marine connector & cable for simplified setup
- Easy installation with reduced footprint
- Lower total costs for sensors, cables, and installation
- Compatible with leading dataloggers (Q330S+, Obsidian8X, Q8)
- Rugged stainless-steel housing rated IP68
- Earthquake Early Warning Systems
- Permanent Seismic Networks
- Microseismic and aftershock monitoring
- Seismic hazard assessment
- Structural health and critical infrastructure monitoring
| Category | Specification |
|---|---|
| Episensor | |
| Dynamic Range | 155 dB+ |
| Bandwidth | DC to 200 Hz |
| Full-Scale Range | ±4g (optional ±2g, ±1g) |
| Output | ±20 V differential |
| Calibration | Standard coil |
| Linearity | <1000 μg/g² |
| Hysteresis | <0.1% FS |
| Cross-axis Sensitivity | <1% (incl. misalignment) |
| Thermal Drift | <500 μg/°C (1g sensor) |
| Housing | Stainless steel IP68, oceanographic-grade connector |
| Dimensions | H: 33 cm, D: 9.8 cm |
| Weight | 5.7 kg (12.6 lbs) |
| Power | 11–18 V DC, 1.5 W |
| Temp. Range | -20°C to +60°C |
| Orientation | Yoke adapter & poles available |
| MBB-2 Seismometer | |
| Sensor Type | Triaxial orthogonal XYZ, feedback elements |
| Sensitivity | 1500 V/(m/s) ±0.5% |
| Bandwidth | -3 dB @ 120s – 160 Hz |
| Clip Level | 13 mm/s to 40 Hz |
| Tilt Range | ±2.5° |
| Dynamic Range | 155 dB @ 1 Hz |
| Velocity Output | 40 Vpp differential |
| Calibration | Input for XYZ, single control line |
| Short Period Mode | 1 sec mode, digital control activation |
| Mass Position Output | Independent output per axis |
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