The early history of seismic networks and instrumentation is reviewed, the Worldwide Standardized Seismograph Network (WWSSN) and its capabilities are described, the characteristics of an improved WWSSN are set forth, and the data handling, processing, user services and support for the improved WWSSN are discussed. The operating sensitivity of long-period seismographs have been increased by more than an order of magnitude for periods above 20 sec as compared to the WWSSN system. This resulted in the installation of the high-gain long-period (HGLP) seismograph system which includes digital recording to increases dynamic range. The improvement of long-period sensing using the advanced borehold seismometer, and the accommodation of a large range of visual signal amplitudes are capabilities of the Seismic Research Observatories. (SRO). In a closely associated project, 5 of the HGLP stations will be furnished with vertical-component short-period seismometers and abbreivated versions of the SRO recording system (ASRO). There exists the basis for a global system having digital recording capability for anticipated studies of global structure, regional structure, and source mechanisms. It would consist of 25 installations from the programs for HGLP, SRO and ASRO stations; 15 very long period gravimeters and about 50 stations of the WWSSN improved with digital recording.

  • Corporate Authors:

    National Academy of Sciences

    Committee on Seismology
    Washington, DC  United States  20418
  • Publication Date: 1977

Media Info

  • Features: Figures; References;
  • Pagination: 75 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00157887
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 27 1977 12:00AM