Radian
POSTHOLE / BOREHOLE
Posthole applications
- Rapid deployment for aftershocks and volcanic unrest monitoring
- Microseismic monitoring in noisy environments
- Legislative compliance monitoring for energy extraction or storage
- Accurate recordings of strong ground shaking caused by local events
- Permanent regional and global seismic networks
- Recording of ice-quakes in glaciers
Borehole applications
- Passive microseismic monitoring
- Vertical seismic profiling (VSP)
- Monitoring of moderate-strong teleseismic earthquakes
- Complement dense surface arrays
High performance sub-surface broadband seismometer with maximum versatility and operational at any angle
The Güralp Radian is a triaxial, force-feedback, broadband, digital seismometer designed for posthole and borehole deployments.
The ultra-wide frequency response between 120 s and 200 Hz makes the Radian ideal for seismic monitoring at all scales, particularly in areas of high cultural noise. For increased flexibility, the high-pass frequency corner can be remotely configured to suit the deployment environment.
At just 55 mm diameter the Radian is the ideal sub-surface digital seismometer and, depending on your intended application, the Radian can be built with either an acceleration or a velocity response.
A velocity response increases long-period gain for monitoring long-period, weak ground motion.
An acceleration response increases gain with frequency for applications such as microseismic monitoring or detection of induced seismicity.
The Radian’s active feedback sensor ensures consistent amplitude and phase response across the bandwidth of the instrument.
The Radian system includes a surface interface unit that delivers advanced data-processing capability and software communications. Data is saved locally in industry standard miniSEED format and streamed remotely using a number of standard protocols - such as SEEDlink and GDI-link.
Integrated network connectivity allows the surface interface unit to be controlled remotely using our free Güralp Discovery software, or via a standard web browser.
The Radian Posthole is operational at any angle, meaning it can be deployed in uncased holes up to 100 m deep
- 120 s to 200 Hz
- Active feedback sensor for consistent amplitude & phase response up to 200 Hz
- Velocity or acceleration response available (select at time of ordering)
- Internal 24-bit digitiser
- STA/LTA triggering
- Stainless steel enclosure
- Remote mass centring
- Windows and Linux compatible
- Internal MEMS accelerometer and magnetometer
- Select from GNSS (GPS, GLONASS or BeiDou) or PTP (Precision Time Protocol) timing sources
- GüVu Bluetooth Android app for installation integrity checking
- Data output in multiple file format options
- IP68 – Protection against effects of permanent immersion under pressure to
2000 m depth (deployment at depths of over 100 m requires optical cable)
The Radian Bore-hole is designed for installations in cased bore-holes of between 60 mm and 100 mm diameter, up to depths of 2000 m
- 120 s to 200 Hz
- Active feedback sensor for consistent amplitude & phase response up to 200 Hz
- Velocity or acceleration response available (select at time of ordering)
- Internal 24-bit digitiser
- STA/LTA triggering
- Stainless steel enclosure
- Remote mass centring
- Windows and Linux compatible
- Internal MEMS accelerometer and magnetometer
- Select from GNSS (GPS, GLONASS or BeiDou) or PTP (Precision Time Protocol) timing sources
- GüVu Bluetooth Android app for installation integrity checking
- Data output in multiple file format options
- IP68 – Protection against effects of permanent immersion under pressure to 2000 m depth (deployment at depths of over 100 m requires optical cable)
The instrument has the same modules as the Radian Post-hole, but instead of a pilot cone, it has two three-jaw hole-lock systems, one at each end of the instrument.
The Radian’s hole-lock system is designed to maintain a positive pressure on the bore-hole casing over a prolonged period of time and to fix the instrument in place whilst avoiding the transmission of any stresses. 120 s to 200 Hz
