Accession Number:

AD0692451

Title:

LASA DECISION PROBABILITIES FOR MS - mb AND MODIFIED SPECTRAL RATIO

Descriptive Note:

Technical note

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

Report Date:

1969-07-23

Pagination or Media Count:

29.0

Abstract:

LASA data have been analyzed to determine the probabilities that MS - mb and Modified Spectral Ratio MSR can be effectively applied to seismic events. The probabilities have been estimated as a function of magnitude and whether the event is an explosion or an earthquake. In the case of the earthquakes, the probabilities go from about 1.0 to 0.0 as mb goes from 5.0 to 4.0. The drop is slightly faster for MS - mb. MSR behaves similarly for explosions. However, the probability for MS - mb in the case of explosions drops to zero roughly over the range of mb from 5.2 to 4.5. In addition, a limited study of joint properties of MS - mb and MSR has indicated that they operate quite independently in the sense that if one of the discriminants yields no decision concerning a particular event, the probability that the other can make a decision is not significantly affected.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE