Automatic Bayesian polarity determination

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 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
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: 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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