Quake Seismometers

The GS seismic station is the fifth generation in ISSI's range of digital seismic data acquisition units. It is the basic node of the Integrated Seismic System (ISS) - a real-time seismic monitoring network. It is primarily designed to form part of the ISS, where a permanent communication connection exists between the GS station and a central computer (network mode). However, it can also act in stand-alone mode, receiving time synchronisation via GPS satellites (if possible) and storing seismic data to a removable USB device.

Features:

Small, light, rugged and low power (< 0.6 W/channel) 6 seismic sensor channels Multiple logical channels Geophone, broadband, force balance or peizoelectric digitizer interface Compatible with Smart seismic sensors (self-conguring) Wide dynamic range: 24-bit, over-sampled data (120 dB @ 48kHz, 150 dB @ 50 Hz) Software selectable sampling rates from 50 Hz to 48,000 Hz Continuous and/or triggered recording Communications via RS232, RS485, PSK or Ethernet for telemetry and/or setup Local data storage on USB2.0 device for o-line retrieval and processing HTML health monitors, via Ethernet device running a web browser Geophone calibration functions Built-in GPS Technical Specification (PDF document)

The GS click to view enlargement

The StandAlone QS (SAQS) enjoys the same high standard as the network QS, but has the additional advantage of being able to operate without realtime communications infrastructure.

up to 6 seismic sensor channels software selectable sampling rates (50 to 24000 sps) 24 bit digitizing triggered and/or continuous modes small , lightweight, low power consumption logging to removable HDD and/or RS232 port dialup via fixed or mobile telephone LCD status display built-in power management, calibration functions multiple logical channels per sensor channel built-in GPS Technical Specification (PDF document)

The SAQS

The QSi seismic data acquisition unit has been designed to be intrinsically safe and may be used in explosive prone mines for real-time seismic monitoring. The latest ultra-low power and embedded micro-processor technologies have been combined to provide an easily installed and maintained portable seismic monitoring network.

5 kHz sampling rate (useful bandwidth up to 1.6 kHz) 3 seismic channels monitors1 tri - axial geophone or 3 uni- axial geophones Power consumption < 110mW at 5- 24V Triggering on STA/LTA ratios between 2 and 16 Up to 16 seismograms internal memory with variable duration Pre- trigger length 200 – 1 000 samples Communications RS485 protocol Half - duplex at rates of up to 115 200 baud Up to 3 units on a single power supply line of up to 2400m, with up to 1200m between units OR Communications PSK protocol 4 to 7 km (cable dependant) Power and communications from central site through standard certified barriers Built- in self test mode (test trigger) Size: 130 mm × 80 mm × 40 mm, mass 810 g Technical Specification (PDF document)

The QSi click to view enlargement

This page last updated: January 2007