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Seismological Research Requirements for a Comprehensive Test-Ban Monitoring System (1995) / Chapter Skim
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3 ISMS DATA CHARACTERISTICS
Pages 23-32

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From page 23...
... It is important, therefore, that the data characteristics of the new ISMS stations be as compatible with the broad needs of seismology in general as is consistent with the objectives of CTBT monitoring. Furthermore, timely general access to the data streams from broadband three-component instruments at the primary and auxiliary stations of the ISMS will allow the best utilization of the data in earthquake monitoring, research, and treaty monitoring activities to benefit the country.
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From page 24...
... As a consequence, an extensive and multifaceted national and international infrastructure exists for collecting local, regional, and global seismic data with varying technical specifications (see Chapter 21. This infrastructure supports research and monitoring functions associated with earthquake hazard mitigation, earthquake engineering, fundamental earthquake investigations, local and global earth structure investigations, and earthquake and tsunami warning systems, as well as nuclear test monitoring systems.
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From page 25...
... Discussion of TSMS Station Technical Requirements TSMS instrument specifications emphasize the short-period end of the seismological spectrum, essential for recording small events, whereas the research community emphasizes recording a very broad spectrum of seismic signals with a dynamic range sufficient to resolve ground noise and to record, on scale, the largest signals. The pane} has not addressed the seismological objectives that drive the technical requirements for the ISMS stations, but they generally appear to be consistent with the needs of a treaty monitoring system.
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From page 26...
... ~. - There are some current applications for the seismic energy above 5 Hz in the earthquake monitoring and basic research communities, and the availability of globally distributed high-firequency data from quiet sites offers new potential for research on earthquakes and earth structure.
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From page 27...
... recommends that the sample rate be reevaluated e. Resolution (~S dB below Peterson's [N~ This requirement is driven by the desire to resolve very low amplitude signals that can be enhanced via stacking array elements.
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From page 28...
... (The sensitivity would have to be set to 800 counts/nm to meet the resolution requirement at 20 Hz.) Sensitivity is adjustable depending on site noise, but for nuclear test discrimination at regional distances the critical passband appears to be in the range of 5 to g Hz.
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From page 29...
... The broad international seismological community has established a standardized digital seismic data-exchange format Standard for the Exchange of Earthquake Data (SEED) , which is now widely used in the FDSN.
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From page 30...
... With respect to auxiliary stations, tolerating reduced data availability, say at the 90 percent level, from an enhanced number of stations would provide data that would still achieve the overall desired availability and that would be of greater use to the seismological research community because of the expanded coverage. For example, given that the signal-to-noise ratio is such that two stations with 90% reliability have recordable ground motion, the probability that at least one of them will actually record is 99%.
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From page 31...
... The continuous primary data can be directly incorporated into real-time analyses conducted by the USGS global earthquake monitoring system, complementing data collected through other networks. In addition, the broad seismological research community has numerous applications of real-time seismic data analysis, and timely
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From page 32...
... There does not appear to be a general requirement in the research community for intermediate products such as the ~ 00 continuous beams formed by each array or f-k spectra as long as access to the raw array data is established by some convenient procedure. This chapter has considered data characteristics proposed by the GSE for the TSMS seismic stations in light of research requirements both for general seismology and for earthquake and nuclear test monitoring and detection.
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Key Terms

  • seismic data
  • data characteristics
  • data streams
  • auxiliary stations
  • technical requirements

  • seismological community
  • sample rate
  • isms stations
  • earthquake monitoring
  • ban monitoring

  • dynamic range
  • earth structure
  • nuclear test
  • treaty monitoring
  • data requirements

  • sampling rate
  • technical specifications
  • array data
  • primary stations
  • recent gse

  • broadband sensors
  • monitoring stations
  • primary station
  • monitoring activities
  • single broadband

  • broader applications
  • standard stations
  • test monitoring
  • isms standard
  • regional distances


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