Pugh, David and White, R. S. and Christie, P. A. F. (2016) Automatic Bayesian polarity determination. Geophysical Journal International, 206 (1). pp. 275-291. ISSN ISSN: 0956-540X, ESSN: 1365-246X DOI https://doi.org/10.1093/gji/ggw146
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Abstract
The polarity of the first motion of a seismic signal from an earthquake is an important constraint in earthquake source inversion. Microseismic events often have low signal-to-noise ratios, which may lead to difficulties estimating the correct first-motion polarities of the arrivals. This paper describes a probabilistic approach to polarity picking that can be both automated and combined with manual picking. This approach includes a quantitative estimate of the uncertainty of the polarity, improving calculation of the polarity probability density function for source inversion. It is sufficiently fast to be incorporated into an automatic processing workflow. When used in source inversion, the results are consistent with those from manual observations. In some cases, they produce a clearer constraint on the range of high-probability source mechanisms, and are better constrained than source mechanisms determined using a uniform probability of an incorrect polarity pick.
Item Type: | Article |
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Uncontrolled Keywords: | 2016AREP; IA70; cml; weekly list |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access 10 - Explosive Earth |
Journal or Publication Title: | Geophysical Journal International |
Volume: | 206 |
Page Range: | pp. 275-291 |
Identification Number: | https://doi.org/10.1093/gji/ggw146 |
Depositing User: | Sarah Humbert |
Date Deposited: | 05 Apr 2016 12:07 |
Last Modified: | 03 Nov 2016 12:26 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/3601 |
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