Seismometers/Seismic Sensors

The S-20 near broadband seismic sensor

  • 3 axis near broadband response (20 sec – 50 Hz) seismometers
  • High sensitivity 1500 V/m/s, low power consumption.
  • Borehole type, 80 mm diameter.
  • Surface type, 140 mm diameter.
  • Typical 20 m cable length, optional up to 150 m
  • Built-in test line.

The S-20 seismometer is a three-component, velocity output, near broadband seismic sensor. The design is based on the electronic velocity feedback which is applied to a single-coil, low period geophone. The frequency bandwidth is extended from 50 Hz down to 20sec.

Two sensor types are provided, a borehole seismometer type and a surface seismometer type.

The borehole type is housed in an 80 mm diameter casing, while the surface type unit’s diameter is 130 mm. The cable length is typically 10 meters. It can be extended to 100 meters or more if required.

No mass lock or centering is required, making an easy connection with the digitizer. The settling time of the unit is very short, only one minute. Sensitivity is 1500 V/m/s (differentially) thus providing a very sensitive seismic sensor. A test line is also provided for calibration and testing.

The sensor is ideal for regional earthquake seismology and for low-frequency grumbling of volcanoes, as well as for aftershock studies.

S20 brochure


The S-100 wide band seismic sensor (MK3 version)

  • 3 axis wide-band response (10 sec – 98 Hz) seismic sensor
  • Designed according to the force balance principle
  • High sensitivity 1500 V/m/s, ultra-low power consumption.
  • Borehole type, 50 mm diameter, elastic packer mounting.
  • Typical 20 m cable length, optional up to 150 m
  • Built-in self-test function.

The S-100 MK3 (third generation) is a three-component, velocity output, seismic sensor. The design is based on the force balance principle using three simple geophone elements, allowing the frequency bandwidth to be extended from 90 Hz down to 0.1 Hz. The default cable length between the sensor casing and the electronics box is approximately 20 meters, but it can be extended up to150 meters.

The sensing elements are housed in the same 50 mm casing making a solid waterproof sensor suitable for installation into boreholes, where the noise is much less than at the surface. The elements are oriented according to the 3 axis principle. A dot mark, incised on the plastic cover of the case, indicates the North direction. A surface-mount sensor package is also available.

The sensor is totally controlled by an advanced, signal conditioner circuit. It supplies current to the geophones, forcing them to a constant vibration at different frequencies. The signal conditioner circuit is fully protected against overvoltage, opposite power supply polarity, and lightning inductive currents. When inactive, it enters the “power-off” mode in order to reduce the power consumption of the system.

S100 brochure


The S-100 wide band seismic sensor (Surface type)

  • 3 axis wide-band response (10 sec – 98 Hz) seismic sensor
  • Designed according to the force balance principle
  • High sensitivity 1500 V/m/s
  • Ultra-low power consumption.
  • Surface type.
  • Velocity feedback design
  • Built-in self-test function.

The S-100 is a three-component, velocity equivalent output, seismic sensor. The unit is ideal for local and regional seismicity and microseismicity monitoring, as well as for induced microseismicity monitoring.

The design is based on the force balance principle. Using three geophone elements, the bandwidth is extended to a lower frequency of the original geophone’s natural frequency. Actually, three generations of the S-100 sensor have been implemented. Several low and upper corner frequencies are provided through different sensor configurations. Therefore, 10s, 5s, 2s, and 1s low cut frequency corners are available, as well as 50, 80, and 98 Hz high cut frequency corners. The sensitivity is 1000 V/m/s for the Mk1 version, while it has been increased to 1500 V/m/s for the Mk2 and Mk3 versions.

The surface type has similar characteristics to the borehole type. No mass lock or centering is required which makes an easy connection with the digitizer. The settling time of the unit is very short, only thirty seconds. Sensitivity is 1500 V/m/s (differentially) thus providing a very sensitive, seismic unit. A test line is also provided for calibration and testing.

S100 brochure


The C-100 seismic sensor

  • 3 component, wideband seismometer
  • Borehole type, optional surface type
  • Only 50 mm diameter
  • Standard 20 m depth
  • Smart elastic clamping
  • Wide response 10 sec – 98 Hz
  • High Sensitivity 1500 V/m/s
  • Force balance design
  • Built-in test function
  • Operation Range: -20 +70°C
  • Matching with SRi32L digitizer/recorders

The C-100 is a three-component, velocity equivalent output seismometer. The sensor consists of three geophone elements, one per axis. When combined with our force balance electronics (third generation), the bandwidth is extended to 10 sec – 98 Hz, and the sensitivity is increased to 1500 V/m/s.

The seismometer electronics are integrated into the SRi32L digitizer and provide a sensitivity of 1500 V/m/s. The default cable length is approximately 20 meters but it can be extended up to 150 meters. A dot sign, engraved on the plastic cover of the case, indicates the direction of each axis. A smart elastic clamping ensures excellent coupling with the borehole at any depth. Optionally, surface mount installation is available

C100_brochure


The S-200 seismic sensor

  • 3 axis, 4.5 – 240 Hz seismic sensor
  • High sensitivity 184 V/m/s.
  • Velocity signal output.
  • Minimum recording signal 2.6 nm/sec.
  • Damping 0.57
  • Borehole type, up to 100 m (shallow borehole).
  • Only 50 mm diameter
  • Elastic packer mounting.
  • Ideal for hydraulic fracturing recording (tested)
  • Operating temperature -40 to +200°C
  • Matching with SRi32 digitizer/recorders
  • Wideband 1 sec/1500 V/m/s available

This type of sensor has been designed for microseismic event recording during hydraulic fracturing reservoir experiments. The sensor body has been designed in order to house double geophone strings at each axis. The orientation follows the 3 axis principle. This sensor has an external diameter of 50 mm allowing it to be installed into small and shallow boreholes, hence reducing the cost of installation. Using a single geophone element per axis, the electronic noise floor becomes a limiting factor for this type of acquisition. Increasing the gain and minimizing the noise floor of the sensor gives us the ability to record even smaller events.

S200_brochure


The S-400 seismic sensor (hydraulic fracturing sensor)

  • 3 axis, 4.5 – 240 Hz seismic sensor
  • High sensitivity 368 V/m/s.
  • Velocity signal output.
  • Minimum recording signal 1.3 nm/sec.
  • Damping 0.57
  • Borehole type, up to 100 m (shallow borehole).
  • Only 50 mm diameter
  • Elastic packer mounting.
  • Ideal for hydraulic fracturing recording (tested)
  • Operating temperature -40 to +200°C
  • Matching with SR24 or SRi32 digitizer/recorders
  • Optional 1 Hz/3000 V/m/s available

This type of seismometer has been designed for microseismic event recording during hydraulic fracturing reservoir experiments. It uses quad geophone strings per axis, in order to maximize sensitivity and minimize noise level. Ideal when paired with our SRi-32 digitizer/recorder.

S400 brochure


GEOtiny! Compact Digital Seismometer

  • 3 component seismic sensor
  • 3 component acceleration sensor
  • Low power consumption.
  • Cost affordable design
  • Only 130 mm diameter – 115 mm height
  • Integrated 24 bit digitizer
  • Embedded SeedLink server
  • Real-time data telemetry and local storage
  • MiniSEED data format
  • Linux open-source OS
  • Web interface menu
  • SSH, SFTP, Telnet
  • Modular seismic sensor design
  • Wide sensor response 10 sec to 120 Hz
  • Customized sensor corner frequency.
  • Operating temperature -40 to +70°C
  • Waterproof IP67 anodized aluminum case.

GEOtiny is a compact, miniature, digital seismometer which integrates three seismic and three acceleration channels. It supports a high-resolution 24-bit digitizer, embedded Linux OS, and GPS or NTP timing. The SeedLink server ensures reliable, real-time, data telemetry while large storage volume ensures a long period, local data recording. The instrument has very low power consumption so it can be powered from a small 12V, DC battery. Due to its small size, it provides the ability to be buried underground. A modular sensor interface allows the user to select between a variety of sensor types and frequency corners (10sec, 5sec, 2sec, 1sec, 2Hz, 4,5Hz), thus covering the short period and wideband seismic range. Design simplicity is a great advantage and it is reflected in the price, which is only a fraction of the cost of common commercial seismometers. The user is able to deploy 100% more units than by using common seismometers at the same cost.

GEOtiny! Compact Digital Seismometer


GEOtiny20 Digital Seismometer (with 20-sec sensor)

  • 3 component seismic sensor
  • Low power consumption
  • Cost affordable design
  • Only 130mm d/155mm h
  • Integrated 24 bit digitizer
  • Embedded SeedLink server
  • Realtime telemetry and local storage
  • MiniSEED data format
  • Linux open-source OS
  • Web interface menu
  • SSH, SFTP, Telnet
  • Modular seismic sensor design
  • Near broadband sensor 20 s to 50 Hz
  • Customized sensor corner frequency
  • High sensitivity 1500 V/m/s
  • Operation Range: -20 +70 °C
  • Waterproof IP67 aluminum case

Connect to GEOtiny from your android or iOS

GEOtiny now supports a wifi connection. Instrument setup and data view has never been easier! Try GEOtiny’s web interface and see the real-time data stream using your mobile device or tablet!