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The S-20 near broad band seismic sensor

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

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

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

The borehole type is housed into a 80mm diameter casing while the surface type unit’s diameter is 130mm. 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 that makes an easy connection with the digitizer. The settling time of the unit is very short, only one minute. Sensitivity is 1500V/m/sec (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 low frequency grumbling of volcanoes as well as for aftershock studies.

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

  • 3-axis Wide Band Response (10sec-98Hz) seismic sensor
  • Designed according the Force-Balance principle
  • High Sensitivity 1500 V/m/sec, Ultra low power consumption.
  • Borehole Type, 50mm diameter, elastic packer mounting.
  • Typical 20m cable length, optional up to 150m
  • Build-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, thus using three simple geophone elements, the frequency bandwidth is extended from 90Hz, down to 0.1Hz. 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 50mm casing, therefore a solid waterproof sensor is suitable for installation into boreholes where the noise is much less than the surface. The elements are oriented according to the 3-axes principle. A dot mark, incised on the plastic cover of the case that indicates the direction of the North direction. Surface mount sensor package is also available.

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

The C-100 seismic sensor

  • 3 component wide band seismometer
  • Borehole type, optional Surface type
  • Only 50mm diameter
  • Standard 20m depth
  • Smart elastic clamping
  • Wide Response 10sec-98Hz
  • High Sensitivity 1500V/m/s
  • Force-Balance Design
  • Build-in test function
  • Operation Range: -20 +70oC
  • Matching with SRi32L digitizers / recorders

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

The seismometer electronics are integrated to SRi32L digitizer and provide sensitivity 1500V/m/sec. The default cable length is approximately 20 meters but it can be extended up to150 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

The S-200 seismic sensor

  • 3-axis, 4.5-240Hz seismic sensor
  • High Sensitivity 184 V/m/sec.
  • Velocity signal output.
  • Minimum recording signal 2.6nm/sec.
  • Damping 0.57
  • Borehole Type, up to 100m (Shallow Borehole).
  • Only 50mm diameter
  • Elastic packer mounting.
  • Ideal for Hydraulic Fracturing Recording (Tested)
  • Operating temperature -40 to +200oC
  • Matching with SRi32 digitizers / recorders
  • Wide band 1sec / 1500V/m/s available

This type of sensor has been designed for microseismic events 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 50mm allowing it to be installed into small and shallow boreholes, hence reducing the cost of installation. Using 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 give us the ability to record even smaller events.

The S-400 seismic sensor (hydraulic fracturing sensor)

  • 3-axis, 4.5-240Hz seismic sensor
  • High Sensitivity 368 V/m/sec.
  • Velocity signal output.
  • Minimum recording signal 1.3nm/sec.
  • Damping 0.57
  • Borehole Type, up to 100m (Shallow Borehole).
  • Only 50mm diameter
  • Elastic packer mounting.
  • Ideal for Hydraulic Fracturing Recording (Tested)
  • Operating temperature -40 to +200oC
  • Matching with SR24 or SRi32 digitizers / recorders
  • Optional 1Hz / 3000V/m/s available

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

GEOtiny! Compact Digital Seismometer

  • 3 components seismic sensor
  • 3 components acceleration sensor
  • Low power consumption.
  • Cost affordable design
  • Only 130mm diameter – 115mm 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 10sec to 120Hz
  • Customized sensor corner frequency.
  • Operating temperature -40 to +70oC
  • Waterproof IP67 Anodized aluminium case.

GEOtiny is a compact miniature digital seismometer which integrates three seismic and three acceleration channels. It supports high resolution 24bit digitizer, embedded linux OS and GPS or NTP timing. Seedlink server ensures reliable real time data telemetry while large storage volume ensures long period local data recording. The instrument has very low power consumption so it can operate getting powered from a small 12V DC battery. Due to its small size provides the ability to be buried underground. 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 wide band seismic range. Design simplicity is the great advantage and it is reflected to the price which is only fraction of the common commercial seismometers. The user is able to deploy even 100% more units than using common seismometers at same cost.

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