United States Geological Survey (USGS) FM cassette seismic-refraction recording system

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Description

In this two chapter report, instrumentation used to collect seismic data is described. This data acquisition system has two parts: (1) portable anolog seismic recorders and related ``hand-held-testers`` (HHT) and (2) portable digitizing units. During the anolog recording process, ground motion is sensed by a 2-Hz vertical-component seismometer. The voltage output from the seismometer is split without amplification and sent to three parallel amplifier circuit boards. Each circuit board amplifiers the seismic signal in three stages and then frequency modulates the signal. Amplification at the last two stages can be set by the user. An internal precision clock signal is ... continued below

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45 p.

Creation Information

Murphy, J.M. December 31, 1988.

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Description

In this two chapter report, instrumentation used to collect seismic data is described. This data acquisition system has two parts: (1) portable anolog seismic recorders and related ``hand-held-testers`` (HHT) and (2) portable digitizing units. During the anolog recording process, ground motion is sensed by a 2-Hz vertical-component seismometer. The voltage output from the seismometer is split without amplification and sent to three parallel amplifier circuit boards. Each circuit board amplifiers the seismic signal in three stages and then frequency modulates the signal. Amplification at the last two stages can be set by the user. An internal precision clock signal is also frequency modulated. The three data carrier frequencies, the clock carrier frequency, and a tape-speed compensation carrier frequency are summed and recorded on a recorded on a cassette tape. During the digitizing process, the cassette tapes are played back and the signals are demultiplexed and demodulated. An anolog-to-digital converter converts the signals to digital data which are stored on 8-inch floppy disks. 7 refs., 19 figs., 6 tabs.

Physical Description

45 p.

Notes

USGS-OFR, USGS Open File Service, Box 25425-Denver Federal Center, Denver, CO 80225; OSTI as DE91001644

Source

  • Other Information: PBD: 1988

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  • Other: DE91001644
  • Report No.: USGS-OFR--88-570
  • Grant Number: AI08-78ET44802
  • DOI: 10.2172/137903 | External Link
  • Office of Scientific & Technical Information Report Number: 137903
  • Archival Resource Key: ark:/67531/metadc628605

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 31, 1988

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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Murphy, J.M. United States Geological Survey (USGS) FM cassette seismic-refraction recording system, report, December 31, 1988; United States. (digital.library.unt.edu/ark:/67531/metadc628605/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.