The Estimation of Seismic Body Wave Signals in the Presence of Oceanic Microseisms,
Abstract
This report describes studies of the processing of broadband seismograms (from a system with displacement response flat from around 0.1 to 10 Hz) for the estimation of signal shape rather than the maximisation of signal-to-noise ratio. By definition, Wiener filtering gives the best estimate of signal shape in the sense that filters are designed to minimise the mean square of the difference between the true signal and the estimated signal, consequently most of the report describes studies of the application of this type of filter. For seismometer array recordings Wiener filters apply both spatial and frequency filtering to extract the signal. However, if the required noise reduction can be obtained by spatial filtering alone, then no frequency filtering is applied and so the signal is passed undistorted. From the data studied in this report it is possible to get noise reductions due to spatial filtering of up to 6 with an array of 4 seismometers. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1981
- Accession Number
- ADA116366
Entities
People
- A. Douglas
- John Young
Organizations
- Atomic Weapons Establishment