AN EXAMPLE OF MAXIMUM-LIKELIHOOD FILTERING OF LASA SEISMOGRAMS.
Abstract
Realizable maximum-likelihood filtering was compared to time-shift-and-summation (phased summation) as an array processing procedure, using records from a single earthquake made by 398 seismometers at the Montana Large Aperture Seismic Array (LASA). The records were prefiltered to eliminate long-period microseismic noise. Within a single subarray (seven kilometers diameter), the maximum-likelihood filter improved signal-to-noise ratio approximately 5 db more than the phased sum. As a method for combining subarray outputs there was no significant difference between the maximumlikelihood filter and phased summation. Approximately two hours of CDC 1604-B machine time were required to calculate the maximum-likelihood filter for each 19-channel subarray. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 14, 1966
- Accession Number
- AD0629739
Entities
People
- D. W. Mccowan
- E. A. Flinn
- R. A. Hartenberger
Organizations
- Teledyne Technologies