Accession Number:

ADA244503

Title:

Recent Methodological Developments in Magnitude Determination and Yield Estimation with Applications to Semipalatinsk Explosions

Descriptive Note:

Final rept. 16 Apr 1989-15 Jul 1991

Corporate Author:

TELEDYNE GEOTECH ALEXANDRIA VA ALEXANDRIA LABS

Personal Author(s):

Report Date:

1991-07-16

Pagination or Media Count:

101.0

Abstract:

An improved magnitude determination procedure is presented to account for the empirical near-source focusingdefocusing effects. This scheme provides more stable m sub b measurements with a reduction in the fluctuational variation by a factor of up to 3. The events which do not show significant improvement could have been detonated in environments with different focusing patterns. The scatter in the network-averaged m sub b based on the new scheme versus logyield is smaller that that for conventional GLM or LSMF m sub b. Our major developments in the seismic yield estimation methodology include 1 a refined m sub b determination scheme 2 a regression algorithm MLE-CY which utilizes the bounded i.e., censored yields in the m sub b-yield calibration based on the maximum-likelihood approach and 3 a regression algorithm DWLSQ which permits both variables to be imprecise due to either rounding or standard measurement errors, thus extending the ordinary weighted least-squares regression. These new techniques are fully tested with recently published Soviet yields of historical Semipalatinsk explosions and the WWSSN m sub b database established at Geotech. The results all appear to be very encouraging in improving our remote monitoring capability.

Subject Categories:

  • Seismology
  • Numerical Mathematics
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE