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Relative azimuth inversion by way of damped maximum correlation estimates

Computers & Geosciences

By:
, , , and
DOI: 10.1016/j.cageo.2012.02.025

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Abstract

Horizontal seismic data are utilized in a large number of Earth studies. Such work depends on the published orientations of the sensitive axes of seismic sensors relative to true North. These orientations can be estimated using a number of different techniques: SensOrLoc (Sensitivity, Orientation and Location), comparison to synthetics (Ekstrom and Busby, 2008), or by way of magnetic compass. Current methods for finding relative station azimuths are unable to do so with arbitrary precision quickly because of limitations in the algorithms (e.g. grid search methods). Furthermore, in order to determine instrument orientations during station visits, it is critical that any analysis software be easily run on a large number of different computer platforms and the results be obtained quickly while on site. We developed a new technique for estimating relative sensor azimuths by inverting for the orientation with the maximum correlation to a reference instrument, using a non-linear parameter estimation routine. By making use of overlapping windows, we are able to make multiple azimuth estimates, which helps to identify the confidence of our azimuth estimate, even when the signal-to-noise ratio (SNR) is low. Finally, our algorithm has been written as a stand-alone, platform independent, Java software package with a graphical user interface for reading and selecting data segments to be analyzed.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Relative azimuth inversion by way of damped maximum correlation estimates
Series title:
Computers & Geosciences
DOI:
10.1016/j.cageo.2012.02.025
Volume
43
Year Published:
2012
Language:
English
Publisher:
Elsevier
Contributing office(s):
Albuquerque Seismological Laboratory
Description:
6 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Computers & Geosciences
First page:
1
Last page:
6
Country:
United States