FURTHER CONSIDERATIONS IN THE USE OF LARGE SEISMOMETER ARRAYS,
Abstract
The problem of estimating signal waveform and time delays in an array of seismometers is considered. Using the model of Levin, Green and Kelly, a matrix form of their solution is obtained. An expression for the asymptotic variance of the estimate of vector delay is obtained and an equation is derived relating this variance to the placement of seismometers. Two general factors affecting the estimate of wave delay are important in determining the distance between seismometers in a linear array. If the distance is large the aperture of the array is large thus decreasing the variance of our estimate. If the distance is small the noise correlation from seismometer to seismometer may be used to decrease the variance. Analysis shows that the former factor is more significant than the latter. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 14, 1963
- Accession Number
- AD0424594
Entities
People
- N. Abramson
Organizations
- Massachusetts Institute of Technology