Seismographic Networks Problems and Outlook for the 1980s: Report (1983) / Chapter Skim
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GLOBAL NETWORKS
GLOBAL NETWORKS
Pages 7-16
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From page 7... ...
. Since then DARPA has been responsible for virtually all advances in global seismographic networks, but has declined to commit funds for routine WWSSN operations.
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From page 8... ...
The HGLP seismographs were superior to the WWSSN seismographs in the detection of long-period earth motion because of their installation in special airtight tanks to protect them from temperature and pressure changes. The HGLP seismographs were also the first globally deployed seismographs to be equipped with digital recorders.
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From page 9... ...
There are many seismologists, both in the United States and in foreign countries, who do not have access to computer facilities and can work only with analog data, who prefer to work with analog data, or who need the denser global coverage of stations provided by the WWSSN. In its relatively short life, the WWSSN has generated an historical data base that is important as a baseline for testing new hypotheses; continuing data from many of the same stations are essential to eliminate the possible effects of station location on recordings of seismic events.
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From page 11... ...
, the research community strongly urged that the USGS provide long-term operational support of the GDSN beginning in l980. Funding for the continued operation of the network by the USGS was planned in the report entitled Earthquake Prediction and Hazard Mitigation: Options for USGS and NSF Programs (NSF, l976)
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From page 12... ...
We have every reason to believe that advances in the coming decades will flow similarly from analyses of data from today's global networks. ASSESSMENT OF PROBLEMS Global networks have been plagued throughout their existence by the lack of sufficient long-term funding from a host organization within which the operation is viewed as a significant element and thus receives enthusiastic support.
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From page 13... ...
In contrast, a large part of university-based seismological research on the earthquake process, earth structure, tectonics, and earthquake prediction relies heavily on the global networks. Thus many non-USGS seismologists depend upon that agency for service in providing high-quality global data while most USGS seismologists do not need such data for their research.
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From page 14... ...
Until very recently, analog seismograms constituted the fundamental data base of global seismology. Although analog records are more limited in dynamic range and more difficult to use for quantitative analysis than digital records, they appeal to the trained eyes of seismologists and other earth scientists more directly.
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From page 15... ...
The importance of the global data base to the seismological community is such that the overwhelming consensus of the workshop participants was that no stations should be eliminated with the possible exception of redundant WWSSN analog and GOSN digital stations. It is anticipated, however, that digital stations will eventually supplant the analog WWSSN stations at selected sites of the global network and that analog (microfiche)
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From page 16... ...
We suggest that a solution to the long-term problem may be to transfer responsibility for the global networks from its present NEHRP base to another location within the Survey or even to another agency so the GSN does not compete directly for funds within a largely unrelated program. In regard to the options open to the USGS over the short term, we recommend seeking funds to support the global networks at the required level from normal budgetary requests, from within the USGS, and from other agencies, such as DARPA, that use data from the networks.
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