Magnitude determinations from coda duration of underground nuclear explosions.

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The concept of determining magnitudes, MTau, of regional events (DELTA less than 1000 km) by means of coda-duration measurements is reexamined by using short-period vertical- component seismogram from Nevada Test Site explosions. The duration is specified as the time interval between the expected arrival of the S-wave and the time when coda waves fall and stay below 80 millimicrons peak-to-peak ground displacement. The suggested procedure requires that for MTau equals 4.0 the coda duration at a distance of 100 km is 120 seconds. The adaptivity of the method is examined in terms of the single-station magnitude scatter, and with respect to the potential accuracy of theyield simation of the explosions. The derival magnitude formula for underground nuclear explosions in granite is of the form MTau equals 0.18 + 0.001DELTA + 1.79 log Tau + Cs, where Cs is a station correction oefficient for non-WWNS stations-Author

Original languageEnglish
JournalGeophysical Institute Uppsala, Seismological Section Report
StatePublished - 1980

ASJC Scopus subject areas

  • General Earth and Planetary Sciences
  • General Environmental Science


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