Bit Seismic Data Recorder and Analyzer

Brief Description

The complete design is based on modular construction by using - Signal Conditioning module, Digital Signal Processor module, Analog to Digital Converter module and Precision Digital Timing module. Recording media for this system has been used very low power CMOS Static RAM of capacity 4 MB that is expandable up to 16 MB. Therefore, system can record field Seismic Event Data for months together as per event frequency. The system has inbuilt interface for connecting the system with any PC/LAP TOP through a standard RS-232 interface for the configuration of the instrument and event data transfer. The highly precision digital timing system has been incorporated by using Temperature Controlled Crystal Oscillator, with a provision to synchronization with ATA/WWV standard time signal transmitted from NPL, New Delhi and USA. The complete instrument software and seismic signal analysis software has been developed for parameters setting and its verification, digital signal processing, data transferring & retrieval and seismic data. The stored seismic data has been formatted/converted into an international standard format, which is compatible with standard SEISAN Seismic Signal Analysis software; therefore, the instrument can be used globally.

Salient Features

• High capacity CMOS Solid State Memory Suitable for recording seismic events for long-term in remote areas.
• Accepts 3 sensors, which can be -seismometers, accelerometers or a combination of the two.
• Programmable sampling rate, 300 sps for single channel and 100 sps for 3 channels.
• Selectable triggering facilities in two different modes viz. STA, LTA ratio and band pass filtered threshold.
• Facilities provided for setting & Editing of field parameters. Display of timing & auxiliary information available on demand.
• In data transfer mode, instrument is connected via RS-232 interface to PC/ Laptop computer that acts as control terminal for the instrument.
• Equipped with the Parameter Setting, Review/ verification Software, Data retrieval software, and Quick-look waveform analysis software and event wise extraction software facility.
• Data recorded by the instrument can be analyzed using internationally available standard software i.e. SEISAN etc.

Applications

• Monitoring of major and micro Earthquakes.
• Study of Preshocks and after shocks.
• Seismic noise Survey & Microzonation.
• Site selection survey for vital structures.
• Strong Motion Recording & Studies.
• Studies on Induced Seismicity.

Benefits

Societal & technological benefits are as indicated in 'Applications' of the instrument.

For further information please contact

Central Scientific Instruments Organisation,
Chandigarh
Website: http://www.csio.res.in/