THETA

The THETA family of sensors consists of several versions of mid-range portable feedback broad band seismometers housed inside waterproof enclosures. These low noise, high dynamic range broad band seismometers are based on newly designed sensors with a truly rectilinear suspension system. They do not require mass lock for transportation, are user friendly and easy to install.

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THETA Standard Version

THETA Standard

The standard product of the THETA family is a mid-range, low-noise seismometer designed to be deployed in vaults or shallow surface installations. Packaged in a rugged vessel of anodized aluminium its three components are oriented in the classical orthogonal configuration, pointing into the three cardinal directions. This unit is a cost effective network sensor.

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THETA Digital

THETA Digital

The THETA digital is an easy to use digital output broadband seismometer. It is based on a THETA Standard seismometer mated with a 8-channel, 24-bit TAU digitizer. Together these units are housed inside a waterproof enclosure of anodized aluminium. The 8-channel 24-bit digitiser exploits the high dynamic range of the truly rectilinear sensors forming a perfect portable seismometer.

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THETA Downhole

THETA Downhole

This slim line seismometer is based on the truly rectiliniear mid-range seismic sensors. It can be used as a posthole or a borehole instrument, rated for wet boreholes down to a depth of 300 m. This three component instrument can operate in a tilt range of up to 25 degrees off the vertical.

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References

  • Ref 1 USHER, M.J., BURCH, R.F. and GURALP, C.M., “Wide-band Feedback Seismometers”, 1979. Physics of the Earth and Planetary Interiors, 18: 38-50.
  • Ref 2 M,J, USHER and C.M. Guralp, “The design of miniature wideband seismometer” Geophys. J.R. ast. Soc. (1978)-55 (605-613) ,
  • Ref 3 GURALP, C.M., “The Design of a Three-component Borehole Seismometer”, 1980. Ph.D. Thesis, Univ of Reading.
  • Ref 4 GURALP C.M. Patent Application, No: 7909579 Filed: 19th March 1979 (declaration priority from Appln No: 10279/78 Filed: 15th March 1978) “Vertical Seismometer”.
  • Ref 5 GURALP C.M. United States Patent Application Number: 4,280.206 March 1979. SEISMOMETERS.
  • Ref 6 GURALP C.M. UK Patent Application GB 2-144-287-A. July 1983 Analog-to-digital converters for Seismometers. The National Research Development Corporation (UK)
  • Ref 7 GURALP C.M. UK Patent Application No. 1900719.4; Title: Infrasound Detector [M&S-IRN.FID4315516]