SURFACE SEISMOMETERS AND ACCELEROMETERS

Our force-feedback, broadband sensor technology has been incorporated into a range of surface instruments designed for a variety of applications, from scientific research, to energy exploration, to infrastructure monitoring and civic protection.

Seismometers

Güralp 3 Series

The pioneer of miniature force-feedback seismometers

The Güralp 3T is the ultimate and original triaxial, broadband, weak-motion seismometer that provides exceptionally high quality monitoring over the long-period. Depending on the required level of performance and the location of the installation you can select from the following options:

3T-360 - an observatory grade instrument for monitoring over the very long period, in very quiet locations
3T-120 - for surface and sub-surface vaults, with the option for a polar casing which is operational and cold-start tested at -55 degrees Celcius.
3T-120PH - a post-hole option suitable for permanent immersion in wet environments

We also manufacture a triaxial 3T borehole sensor which can be used alone or in combination with an accelerometer in a single instrument. For more information see our borehole and subsurface page.

A high-performance, observatory grade seismometer for monitoring the very long period with 360 s to 50 Hz frequency response (option to 100 Hz)

  • 1500 V/ms-1 (2 x 750 V/ms-1) sensitivity
  • Covers the complete seismic spectrum with a single transfer function
  • Measured Self noise below the USGS NLNM from 200 s (0.005 Hz) and remains below the high frequency limit of the NLNM at 10 Hz
  • High linearity: >111 dB (USGS figures)
  • Dynamic range of 167 dB at 1 Hz (Full octave width across 1 Hz)
  • Cross axis rejection over 65 dB; sensor axes orthogonal to within ±0.05°
  • Remote, automatic electronic mass locking, unlocking and centring
  • Operating tilt range of ±2.5° with adjustable feet for off-horizontal installation bases
  • Low power consumption: 0.75 W from a 10–36 V supply
  • Stainless steel enclosure
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours
  • Optional Atmospheric Pressure Isolator - see accessories tab

For surface and sub-surface installations with a reponse of 120 s to 50 Hz (option to 100 Hz) with a polar casing available for deployments in environments to -55 °C.

  • 1500 V/ms-1 (2 x 750 V/ms-1) sensitivity
  • Covers the complete seismic spectrum with a single transfer function
  • Measured Self noise below the USGS NLNM from 166 s (0.006 Hz), remaining below the high frequency limit of the NLNM at 10 Hz
  • High linearity: >111 dB (USGS figures)
  • Dynamic range of 167 dB at 1 Hz (Full octave width across 1 Hz)
  • Cross axis rejection over 65 dB; sensor axes orthogonal to within ±0.05°
  • Remote, automatic electronic mass locking, unlocking and centring
  • Operating tilt range of ±2.5° with adjustable feet for off-horizontal installation bases
  • Low power consumption: 0.75 W from a 10–36 V supply
  • Available in surface, posthole or polar casing
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours

For posthole installations

  • 120 s to 50 Hz frequency response (option to 100 Hz)
  • 1500 V/ms-1 (2 x 750 V/ms-1) sensitivity
  • Covers the complete seismic spectrum with a single transfer function
  • Measured Self noise below the USGS NLNM from 166 s (0.006 Hz), remaining below the high frequency limit of the NLNM at 10 Hz
  • High linearity: >111 dB (USGS figures)
  • Dynamic range of 167 dB at 1 Hz (Full octave width across 1 Hz)
  • Cross axis rejection over 65 dB; sensor axes orthogonal to within ±0.05°
  • Remote, automatic electronic mass locking, unlocking and centring
  • Operating tilt range of ±2.5° with adjustable feet for off-horizontal installation bases
  • Low power consumption: 0.75 W from a 10–36 V supply
  • Stainless steel enclosure
  • 100 bar / 10 MPa waterproof connector
  • IP68 - protection against effects of permanent immersion under pressure to 350 m depth
Accessories for 3T-360:
Atmospheric Pressure Isolator - protects the sensors from very slight fluctuations in temperature and pressure that can effect the instrument self-noise

Applications

  • Local, regional and teleseismic monitoring
  • National seismic networks
  • Nuclear test ban treaty monitoring
  • Earth tide observations
  • Ice quake monitoring
    (3T-120 Polar)

Güralp 3ESPC Series

A truly portable, broadband, weak-motion triaxial seismometer

The Güralp 3ESPC is a proven weak-motion triaxial broadband seismometer for the price and size of a medium-motion instrument.

Ideally suited for long-term temporary and permanent installations in areas with low to moderate noise levels. The instruments' broadband response and low self-noise level make it suitable for seismic monitoring at all scales: local, regional and teleseismic.

In addition to the analogue instrument, we also offer two digital variants:

3ESPC -analogue instrument
3ESPCD - integrated with a digitiser for low-power deployment with Flash memory storage
3ESPCDE - integrated with a digitiser and acquisition module with web-based user interface and communication over serial and Ethernet

A low-power and portable instrument for areas with low to moderate noise

  • 60 s - 100 Hz standard frequency response, (option of 120 s low-pass corner)
  • Covers the complete seismic spectrum with a single transfer function
  • Self noise below the USGS NLNM from 30 s to 16 Hz
  • High linearity: > 107 dB horizontal, 111 dB vertical
  • Over 140 dB dynamic range over a wide frequency band
  • Cross axis rejection over 62 dB; sensor axes orthogonal to within ± 0.05°
  • Robust automatic mass locking, unlocking and centring
  • Low power consumption of just 750 mW
  • Truly portable - just 8.4 kg with lifing handle, and convenient access to connectors
  • Hard anodised aluminium enclosure
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours

The 3ESPC with integrated digitiser for easy, low-power deployment and data collection

  • 60 s - 100 Hz standard frequency response, (option of 120 s low-pass corner)
  • 6000 V/ms-1 (2 x 3000 V/ms-1) sensitivity
  • Covers the complete seismic spectrum with a single transfer function
  • On board 24-bit digitiser with configurable output and up to 32 GB of built in Flash memory
  • High linearity: >107 dB, 111 dB vertical
  • Over 140 dB dynamic range; low self noise over a wide frequency band
  • Cross axis rejection over 62 dB; sensor axes orthogonal to within +/- 0.05°
  • Robust automatic mass locking, unlocking and centring
  • Adjustable feet allow for levelling up to 4° tilt
  • Truly portable - 9.3 kg with lifing handle and convenient access to connectors
  • Simple and fast live data download over FireWire. Ethernet and Wi-Fi options available
  • Hard anodised aluminium enclosure
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours

Integrated with a Linux-based digitiser and data acquisition module offering web-based user interface and communication over serial and Ethernet

  • 60 s to 100 Hz (option of 120 s to 100 Hz)
  • 6000 (2 × 3000) V/ms-1 sensitivity
  • Hard anodised aluminium enclosure
  • Remote-controlled mass locking/unlocking
  • 3 channel 24-bit ADC (primary)
  • 1 auxiliary 24-bit ADC (used for auxiliary input and calibration signal)
  • Over 140 dB dynamic range; low self noise over a wide frequency band
  • High linearity: >107 dB, 111 dB vertical
  • Cross axis rejection over 62 dB; sensor axes orthogonal to within +/- 0.05°
  • STA/LTA triggering
  • Linux OS with web server
  • Ethernet output
  • Digitiser and sensor control via Platinum software (via web browser), Güralp Scream! software (free download), Terminal window over SSH or serial link
  • Data recording in GCF and MiniSEED
  • Data streaming protocols: GCF (Scream!), SEEDlink, CD1.1 and GDI-link
  • Internal 16 GB Flash memory with USB 2.0 port
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours
Accessories for 3ESPCD:
DSK 250 GB ruggedised portable disk (SSD) READ MORE

Applications

  • Local, regional and teleseismic monitoring
  • National seismic networks
  • Permanent volcano monitoring networks
  • Long-term microseismic monitoring
  • Rapid temporary deployments, e.g. aftershock
    and volcanic unrest monitoring

Güralp 40 Series

Small, rugged and robust, ideal for rapid deployment


The Güralp 40 series of triaxial, broadband seismometers are ideal for rapid deployment in challenging environments such as for volcanic unrest or aftershock monitoring. They are also well suited for installation in vaults with moderate environmental noise levels. With top access to connectors they are also suitable for posthole or direct burial installations.

40T - analogue instrument
40TDE - integrated with a Linux based digitiser and acquisition module, with web-based user interface and communication over serial and Ethernet

Small, rugged seismometer suitable for seismic monitoring at local and regional scales

  • 60 s to 100 Hz (options of 1 or 30 s to 100 Hz)
  • 2000 V/ms-1 (2 x 1000 V/ms-1) sensitivity
  • Direct velocity outputs
  • Robust, corrosion-resistant stainless steel enclosure
  • Fully adjustable levelling feet
  • Low power consumption of just 780 mW
  • No mass locking required - plug in and go
  • High dynamic range (151 dB at 5 Hz)
  • Lowest spurious vibration is a barely measureable resonance at 450 Hz
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours

With integrated Linux-based digitiser and acquisition module offering web-based user interface and communication over serial and Ethernet

  • 60 s to 100 Hz (options of 1 or 30 s to 100 Hz)
  • 3200 V/ms-1 (2 × 1600 V/ms-1) sensitivity
  • Robust, corrosion-resistant stainless steel enclosure
  • Fully adjustable levelling feet
  • No mass locking required - plug in and go
  • 3 channel 24-bit ADC (primary)
  • 1 auxiliary 24-bit ADC (used for auxiliary input and calibration signal)
  • The high-gain feedback loop eliminates mechanical nonlinearity (the overall measured linearity exceeds 90 dB) and minimises resonance in the spring system
  • The lowest spurious vibration mode of the 40T sensor is a barely measureable resonance at 450 Hz
  • Low self noise results in over 145 dB dynamic range across a wide frequency band
  • Cross axis rejection over 62 dB; sensor axes orthogonal to within +/- 0.05°
  • STA/LTA triggering
  • Linux OS with web server
  • Ethernet output
  • Digitiser and sensor control via Platinum software (via web browser), Güralp Scream! software (free download), terminal window over SSH or serial link
  • Data recording in GCF and MiniSEED
  • Data streaming protocols: GCF (Scream!), SEEDlink, CD1.1 and GDI-link
  • Internal 16 GB Flash memory with USB 2.0 port
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours
40TDE Accessories:
Armoured USB pod with 16 or 64 GB storage

Applications

  • Local and regional monitoring
  • Volcano monitoring
  • Microseismic monitoring
  • Passive seismic imaging
  • Rapid temporary deployments, e.g. aftershock
    and volcanic unrest monitoring

Güralp 6 Series

Ultra-low-power and lightweight for rapid deployment in the field

The Güralp 6 series are ultra-low-power, lightweight, triaxial, broadband seismometers ideally suited for one-person rapid installation in sites with moderate noise such as for aftershock or volcanic unrest monitoring.

6T - analogue instrument
6TD - integrated with a digitiser for low-power deployment with Flash memory storage

Portable and lightweight, a rugged seismometer ideal for rapid deployment

  • 30 s to 100 Hz
  • 2400 V/ms-1 (2 × 1200 V/ms-1) sensitivity
  • Hard anodised aluminium enclosure
  • Auto centre, no mass locking required
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours
  • Direct velocity outputs
  • Quick and easy, one-person installation
  • Easy access to electrical connections
  • No mass clamping required - plug in and go
  • High sensitivity and dynamic range
  • Ultra-low-power consumption of just 0.48 W
  • Orthogonal instrument with high cross axis rejection (>65 dB)
  • The overall measured linearity exceeds 90 dB

The 6TD offers a convenient digital solution in a single, light-weight, low-power and rugged form factor

  • 30 s to 100 Hz
  • 2400 V/ms-1 (2 × 1200 V/ms-1) sensitivity
  • Hard anodised aluminium enclosure
  • 3 channel 24-bit ADC
  • STA/LTA triggering
  • 4 GB Flash memory with IEEE1394 port
  • Digitiser and sensor control via Güralp Scream! software (free download) and command line
  • Data recording in GCF
  • Data streaming protocols: GCF (Scream!)
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours
  • Quick and easy, one-person installation
  • No mass clamping required - plug in and go
  • High sensitivity and dynamic range
  • Optional features
    • Ethernet
    • Wi-Fi
    • Additional memory up to 16 GB
    • Smart case allows five instruments to be stored, transported and powered up for data-downloading and pre-deployment testing
6TD Accessories:
Smart-case (pictured) - allows five 6TDs to be stored, transported and powered up for data-downloading and pre-deployment testing.

DSK - 250 GB rugged industrial hard disk (Firewire/USB) READ MORE

Applications

  • Induced seismicity monitoring
    e.g. hydraulic fracturing
  • Rapid deployments e.g. aftershock
    and volcanic unrest monitoring

Accelerometers

Fortis and Fortimus

High-performance, low-noise and compact broadband accelerometers with flexible gain options.

The Fortis and Fortimus are strong motion accelerometers, making them ideal for local earthquake early warning and structural health monitoring applications. They all feature flexible gain options so they can perform optimally in a wide range of earthquake monitoring scenarios.

Fortis - analogue instrument
FortisPH - posthole instrument for prolonged deployment in wet environments
Fortimus - the Fortis triaxial sensor is integrated with the feature-rich Minimus digitiser to deliver a range of advanced data processing and communication capabilities that make it ideal for applications that require ultra-low-latency

A strong motion accelerometer with compact design for fast installation in any environment.

  • User selectable gain options: ±4 g, ±2 g, ±1 g or ±0.5 g, manually on the sensor or remotely when operating with the Minimus digitiser
  • Hard anodised aluminium enclosure
  • Can be installed easily and rapidly with an M8×75 fixing bolt
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours
  • Very low-noise components for high precision and enhanced dynamic range
  • Isolated power supply for 10 - 36 V operation
  • Acceleration offsets adjustable for <1 mV precision

A Fortis triaxial sensor in a posthole, stainless steel casing with 100 bar / 10 MPa waterproof connector

  • DC - 100 Hz
  • Remote user-selectable gain options: ±4 g, ±2 g, ±1 g or ±0.5 g when operating with the Minimus digitiser
  • Stainless steel enclosure
  • 100 bar / 10 MPa waterproof connector on top (height 32 mm)
  • IP68 - protection against effects of permanent immersion under pressure to 350 m depth
  • Optional lifting bail assembly (height 259 mm)

Combining the Fortis accelerometer with the powerful Minimus digitiser in one compact unit with touchscreen LCD and Wi-Fi. Power over Ethernet and Precision Time Protocol allows for single cable deployment

  • DC - 315 Hz
  • Variable gain options: ±4 g, ±2 g, ±1 g or ±0.5 g
  • Touch-sensitive LCD screen
  • Integrated 24-bit Minimus digitiser
  • Ultra-low-latency mode for Earthquake Early Warning
  • STA/LTA, group voting and triggering
  • 64 GB hot-swappable internal dual redundant microSD card storage
  • Common Alert Protocol (CAP) enabled for automated emergency warning
  • Ethernet communication with Power over Ethernet (PoE) for remote control using Güralp Discovery software or standard web browser
  • GüVü Bluetooth (Android and iOS) App for installation integrity checking
  • Select from GNSS (GPS, GLONASS or BeiDou) or PTP (Precision Time Protocol) timing sources
  • Wi-Fi
  • Windows, Linux and macOS compatible
  • Data recording in MiniSEED with metadata stored in dataless SEED format
  • Data streaming protocols: GCF (Scream!) GDI-link* and SEEDlink* (*metadata sent in RESP / dataless SEED file formats)
  • Hard anodised aluminium enclosure
  • IP68 - protection against effects of prolonged immersion at 3 m depth for 72 hours
FortisPH Accessories:
Lifting bail assembly

Fortimus Accessories:
64 GB industrial SD card

Applications

  • Earthquake Early Warning systems
  • Structural health monitoring (e.g. dams, industry, buildings)
  • Networked arrays

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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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