Guralp - Radian Borehole

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

• 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, Linux and macOS compatible
• Internal MEMS accelerometer and magnetometer
• Select from GNSS (GPS, GLONASS or BeiDou) or PTP (Precision Time Protocol) timing sources
• Bluetooth (Android and iOS) 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)

Posthole deployments:

• 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 deployments:

• Passive microseismic monitoring
• Vertical seismic profiling (VSP)
• Monitoring of moderate-strong teleseismic earthquakes
• Complement dense surface arrays