Seismological Equipment

Standard Seismic Sensors

PMD Scientific offers seismometers based on out proprietary electrochemical transducer technology that affords them many unique features; most importantly exceptional robustness and virtual no maintenance operation. In particular no mass locks are needed, and no mass centering required over the full operating temperature range. Two families are offered: broadband and medium period ('BB' and 'MP' models respectively). All instruments are available in field, borehole and ocean bottom configurations.

Special Seismic Sensors

PMD Scientific offers tailor made seismic sensors for special applications. Some of them are Low Noise Borehole Seismometer for a deep borehole studies , Direct readout (as opposed to the differential method of measurement) rotational seismometers, isotropic underwater seismometers SP400U3 Linear Supercollider Beam Focusing System models LC500 & LC501 capable of working in extremely strong magnetic fields up to 60,000 Gauss (6T) and very hard radiation

Standard Seismic Recorders

DAS6501 is high resolution 24-bit very low power with up to 16 acquisition channels ,versatile & economical seismic recorder and DAS6102 with up to 32 acquisition channels (up to 48 on special orders). Both recorders are very rugged, weatherized and equipped with very friendly user interface, including the 7" VGA LCD display. The DAS6502 is an ultra-low power (~600mW) lightweight recorder with configurable form-factor aimed at short and long-term autonomous ocean-floor deployment. The SD6503 Seismic Digitizer is an ultra-low power 24-bit instrument that can work with any sensor as a stand-alone device or as a built-in addition to any of the seismometers.

Strong Motion Sensors & Recorders

PMD Scientific offers two models of miniature, rugged force-balanced accelerometers (FBA), a unique force-balanced rotational seismometer, and two models of high resolution strong motion recorders with external or built-in FBA.

Economical Recorders for Seismic Network

These instruments are simplified economical versions of the corresponding fully feature PMD recorders. In multi-station seismic network they offer significant savings.

Microseismic Recorders

The Terrascience Microseismic Acquisition unit (TMA) is 24-bit digital data recording system. The TMA units are specifically designed for high performance data acquisition applications. The standard configuration consists of 4 to 24 channels of 24 bit A/D modules in 4 channel increments. Each channel employs an extremely low noise 4th-order Delta-Sigma modulator and programmable digital filter.

Data Acquisition Recorder

The Terrascience Acquisition Recorder (TAR) is a 12, 14, 16 or 24-bit digital data recording system is based upon the Terrascience Systems’ MicroRad series of microseismic systems. The TAR software is designed to perform multiple tasks in parallel with acquiring data being the basic task. The TAR software processes incoming data looking for events, stores data to a circular buffer, generates complete statistics, transfers data to a remote database and shows data in a graphical real time viewer.

ULF Equipment

Since earthquakes are physical phenomena, it can be expected that science will find some predictive qualities to forecast the behavior of seismic activity. The most promising area of research is seismo electromagnetic science, which monitors and analyses the subtle effects in the earth and ionosphere that occur several hours to several days before major earthquakes. This area of science may very well provide the foundation for earthquake forecasting. QuakeFinder is experienced in the area of both fixed site, 3-axis, high sensitivity magnetometers, and portable instrumentation. The fixed station system QF-1005 comprises of 3 axis magnetometers and a air conductivity sensor. Portable systems are very useful for doing site surveys and determining if the sites are magnetically "quiet" enough before time, effort, and funds are expended installing a permanent site.

Gladwin Tensor Strain Monitor (GTSM), measures strain in the earth due to tectonic or engineering stress. It was developed as a complementary technology to a direct ultrasonic stress measurement system devised for tectonic studies in 1969. The GTSM system was the first high precision, high stability multi-component (tensor) system developed for deep boreholes. It allowed direct evaluation of variation of the amplitude and the orientation of the principle components of strain.