Deconvolution of long-core paleomagnetic data of Ocean Drilling Program by Akaike's Bayesian information criterion minimization

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doi: 10.1029/95JB02811
Author(s): Oda, Hirokuni; Shibuya, Hidetoshi
Author Affiliation(s): Primary:
Kyoto University, Department of Geology and Mineralogy, Kyoto, Japan
Other:
University of Osaka Prefecture, Japan
Volume Title: Journal of Geophysical Research
Source: Journal of Geophysical Research, 101(B2), p.2815-2834. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0148-0227
Note: In English. 17 refs.; illus., incl. 1 table
Summary: Deconvolution of long-core paleomagnetic data of the Ocean Drilling Program (ODP) was developed based on Bayesian statistics. Samples of deep-sea sediments obtained by drilling with an advanced piston corer are subjected to pass-through measurements by a cryogenic magnetometer aboard the ODP's research vessel (Joides Resolution) which provide continuous paleomagnetic records. Deconvolution of the magnetometer output was developed in order to obtain more detailed variations of the magnetization than permitted by the spatial resolution of the pickup coil (approximately 11 cm). The magnetization vector was modeled as a smoothly changing sequence parametrized by L 2 norm of second-order difference and then deconvolved using a matrix calculation as a smoothness constrained least squares method. The optimum smoothness was obtained by minimizing Akaike's Bayesian Information Criterion which is a measure of the logarithm of the likelihood. This deconvolution scheme was applied to pass-through data artificially produced by convolving synthetic reversal record and adding a Gaussian noise. The amplitude of the noise was estimated and the variations shorter than the spatial resolution of the sensor were obtained. The deconvolution also was applied to the real pass-through data from Holes 769A and 769B measured at intervals of 5 mm. The deconvolution revealed variations of the magnetizations with a maximum spatial resolution of about 2 cm. The magnetizations after deconvolution were in good agreement with magnetization values measured separately on cube samples taken at intervals of 5 or 10 cm. Copyright 1996 by the American Geophysical Union.
Year of Publication: 1996
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Bayesian analysis; Cores; Deconvolution; Equatorial Pacific; Least-squares analysis; Leg 124; Marine sediments; North Pacific; Northwest Pacific; ODP Site 769; Ocean Drilling Program; Pacific Ocean; Paleomagnetism; Secular variations; Sediments; Statistical analysis; Sulu Sea; West Pacific
Coordinates: N084706 N084709 E1211742 E1211309
Record ID: 1996045271
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