Global Earthquake Monitoring, Its Uses, Potentials, and Support Requirements (1977) / Chapter Skim
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Improved Worldwide Standardized Seismograph Network
Improved Worldwide Standardized Seismograph Network
Pages 41-45
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From page 41... ...
Such an integrated system, with digital recording capability and augmented by ocean-bottom seismographs and by portable instruments for short-term field studies of particular earthquakes, is essential for anticipated studies of the internal structure and dynamics of the earth, of regional structure, and of earthquake source mechanisms. (See Appendix A.)
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From page 42... ...
In areas where key geographical coverage is lacking, it may be necessary to upgrade reliable non-WWSSN stations to WWSSN status with digital-recording capability. All together, we have identified about 90 installations for the basic integrated network, thus permitting the system to provide sufficient data for the study of source mechanisms, dispersion characteristics of fundamental- and higher-mode surface waves, amplitudes of long-period body waves, and frequencies and line widths of the earth's free oscillations.
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From page 43... ...
These instruments could be quickly emplaced in the aftershock regions of large earthquakes to provide needed information for studies of earthquake source mechanisms, regional upper-mantle properties, diffracted waveforms, geothermal sources, and regional surface-wave dispersion. Stations on oceanic islands help to improve the geographical coverage; seismographic stations operating on the ocean bottoms must also be given serious consideration and support.
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From page 44... ...
Ideally, this global earthquake observation system would have broadband instruments sited in an optimal geographical configuration. The addition of a number of portable broadband digital instruments would be of great importance to many studies, including aftershock sequences, areas of geothermal interest, and source mechanisms.
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From page 45... ...
The USGS Albuquerque Seismological Laboratory is recommended as the facility to carry out basic quality control of incoming digital seismic data and merging onto magnetic tapes, and the NOAA/EDS is recommended as the facility for archiving and distributing the data on magnetic tapes.
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