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By National Research Council, Division on Earth and Life Studies, Environment and Resources Commission on Geosciences, Board on Earth Sciences and Resources, Committee on Seismology, Panel on Regional Networks

This publication assesses the 50 local seismic networks funded by means of quite a few federal, country, and personal resources that function autonomously within the usa. so much have getting older apparatus and be afflicted by declining resources of working money. but, they supply beneficial clinical information in addition to information regarding seismicity and earthquakes round their locales.
The quantity describes the arrival of the recent nationwide Seismic community, operated via the U.S. Geological Survey. The nationwide Seismic community presents a distinct chance to combine the nearby networks with the nationwide community. the program will defend the precious paintings of the neighborhood networks and improve the functions of the nationwide community.

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Please use the print version of this publication as the authoritative version for attribution. S. NATIONAL SEISMIC NETWORK 35 About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted.

ADVANTAGES OF A NATIONAL SEISMIC SYSTEM It is important to reemphasize that the USNSN will not meet the need for data that can be obtained only through the dense spacing of individual stations in the typical regional network. The resolution required for the definition of local active tectonic structures cannot be achieved by the proposed national effort. Variations in propagation and seismic wave amplification, important in the assessment of earthquake hazards on a regional and local scale, cannot be measured by the USNSN.

Because the networks had been in operation for many years prior to the earthquake, 15 years of pertinent data had already been archived. A search of these data for small earthquakes produced by thrust faulting showed that the full length of the anticline, from Whittier to Malibu, is indeed underlain by active thrust faults. These results have led to a reevaluation of the earthquake hazards facing the Los Angeles area. The new scientific findings are, in turn, being considered by local governments as they revise the seismic safety elements in their general plans.

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