BOREHOLE AND SUB-SURFACE INSTRUMENTS

We offer a range of instruments to assist you in achieving measurement at depth, allowing you to get closer to the seismic event and improve the accuracy of sub-surface velocities and event depths. 

Our borehole instruments can house both seismometer and accelerometer sensors or a combination of the two. They can also be strung together for vertical seismic profiling (VSP).

If you are considering procuring a borehole instrument we recommend you review our borehole questionnaire early on in your planning as it will help you understand the key information that we need to design an effective borehole system.

Through experience, we have learnt that there is a high level of complexity in designing and installing borehole systems. For this reason, we strongly recommend that one of our field engineers is involved in installing Güralp boreholes, particularly for a first installation.

Radian Posthole and Borehole

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, GDI-link and GCF.

Integrated network connectivity allows the surface interface unit to be controlled remotely using our free Güralp Discovery software, or via a standard web browser.

Read more about Discovery software.

The Radian Posthole is operational at any angle, meaning it can be deployed in uncased holes up to 100 m deep.

The pilot cone at the end of the Radian Posthole is designed to aid direct burial.

  • 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)



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.

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)



Applications

  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

3TB

The 3T borehole system designed for borehole diameters of 103 to 229mm

The 3T analogue sensors can be combined with a DM24 borehole digitiser and EAM data acquisition module to build a fully networked authenticating digital instrument inside a single borehole.

The instrument is supplied with surge protection and a strain relief mechanism to isolate the sensors in the instrument from motions in the cable.

The flexible, modular design offers a range of installation possibilities.
  • Covers the complete seismic spectrum with a single transfer function
  • The 3T family offers standard frequency responses of either a 120 s or a 360 s long period corner, other bespoke options are available on request
  • Hybrid velocity-acceleration responses available offering unrivalled dynamic range.
  • Single or three-jaw hole lock for 113 to 229 mm diameter boreholes, or backfill with sand to minimise convection
  • Waterproof and durable with O-ring seals throughout
  • Built-in inclinometer option for attitude checking
  • Operates with a tilt tolerance of up to 2.5 º  with an option to increase this to 12.5 º
We can provide tripods, winches and other equipment designed specifically for borehole installations.

Applications

  • Vertical seismic profiling
  • Microseismic monitoring
  • Robust velocity subsurface modelling
  • Teleseismic earthquake monitoring
  • Nuclear test ban treaty monitoring

5TB

The 5TB houses an accelerometer that is designed for strong-motion borehole studies in cased holes with diameters of 82 to 120 mm

The triaxial analogue sensor can be combined with the DM24 borehole digitiser or a surface digitiser to build a fully networked, integrated borehole monitoring system.

The instrument is supplied with surge protection and a strain relief mechanism to isolate the sensors in the instrument from vibrations in the cable.
  • Flat acceleration output from DC to 100 Hz (200 Hz option)
  • 76 mm outer diameter
  • Optional single-jaw lock for boreholes of 82 - 120 mm diameter
  • Waterproof and durable with O-ring seals throughout
  • Suitable for installation with sand backfill to minimise convection
  • Dual output (high and low gain) and optional high/low pass filters
  • Optional electronic compass module to determine downhole attitude
  • Remote DC offset zeroing
We can provide tripods, winches and other equipment designed specifically for borehole installations. To gain a fuller understanding of the key considerations for installing a borehole system, complete our borehole questionnaire at the bottom of this page.

Applications

  • Vertical arrays
  • Earthquake Early Warning systems
  • Strong motion seismic hazard modelling
  • Studies of ground amplification / attenuation

PRODUCT ENQUIRY


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Name:*
E-mail:*
Country:
Please select all products of interest:
Other (please provide details):
Please select the application most relevant to your enquiry:
Please add anything else that may be relevant to your enquiry:

Please note that by submitting your details you are indicating consent to our processing your personal data as explained in our Privacy Notice which you can view here.

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Güralp Systems Ltd.
3 Midas House, Calleva Park
Aldermaston, Reading
RG7 8EA
United Kingdom

Tel: 01189 819056
Email: sales@guralp.com
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