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https://hdl.handle.net/2440/45536
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Type: | Journal article |
Title: | Effect of coherent noise on single-station direction of arrival estimation |
Author: | Greenhalgh, S. Zhou, B. Rutty, M. |
Citation: | Journal of Seismology, 2008; 12(3):377-385 |
Publisher: | Kluwer Academic Publ |
Issue Date: | 2008 |
ISSN: | 1383-4649 1573-157X |
Statement of Responsibility: | Stewart Alan Greenhalgh, Bing Zhou and Matthew Rutty |
Abstract: | Polarization analysis of multi-component seismic data is used in both exploration seismology and earthquake seismology. In single-station polarization processing, it is generally assumed that any noise present in the window of analysis is incoherent, i.e., does not correlate between components. This assumption is often violated in practice because several overlapping seismic events may be present in the data. The additional arrival(s) to that of interest can be viewed as coherent noise. This paper quantifies the error because of coherent noise interference. We first give a general theoretical analysis of the problem. A simple mathematical wavelet is then used to obtain a closed-form solution to the principal direction estimated for a transient incident signal superposed with a time-shifted, unequal amplitude version of itself, arriving at an arbitrary angle to the first wavelet. The effects of relative amplitude, arrival angle, and the time delay of the two wavelets on directional estimates are investigated. Even for small differences in angle of arrival, there may be significant error (>10°) in the azimuth estimate. |
Keywords: | Coherent noise Seismic direction finding Triaxial station |
Description: | The original publication can be found at www.springerlink.com |
Provenance: | Published online: 18 January 2008 |
DOI: | 10.1007/s10950-007-9085-8 |
Published version: | http://dx.doi.org/10.1007/s10950-007-9085-8 |
Appears in Collections: | Aurora harvest 6 Chemistry and Physics publications |
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