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A ridgelet transform method for constraining tectonic models via abyssal-hill morphology

Downey, Nathan J. and Clayton, Robert W. (2007) A ridgelet transform method for constraining tectonic models via abyssal-hill morphology. Geochemistry Geophysics Geosystems, 8 . Art. No. Q03004. ISSN 1525-2027. doi:10.1029/2006GC001440.

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Abyssal-hill shape and orientation are related to the direction and spreading rate of paleo-spreading centers. Therefore analyzing abyssal-hill shape and trend is useful for constraining tectonic models of regions devoid of magnetic reversal anomalies. Detecting systematic changes of abyssal-hill shapes or trends, due to changes in spreading rate or direction, is not straightforward, which makes it difficult to determine appropriate regions over which to average abyssal-hill parameters. Often, however, detecting these systematic changes, where they occur, and the scale over which they occur, is of primary importance for tectonic reconstructions. We present a new method of abyssal-hill analysis that is based on the ridgelet transform, a relative of the two-dimensional wavelet transform. Our method is capable of locally estimating the width, azimuth, and root-mean-square (RMS) amplitude of abyssal-hill fabric and highlights changes in these parameters across a survey area, making it possible to identify regions created with a constant spreading rate and direction. We use three multibeam swaths, one crossing the Osbourn Trough in the southwest Pacific Basin, one crossing the East Pacific Rise, and one crossing the Mid-Atlantic Ridge, to demonstrate the utility and performance of our method.

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Clayton, Robert W.0000-0003-3323-3508
Additional Information:© 2007 by the American Geophysical Union. Received 3 August 2006; accepted 8 December 2006; published 8 March 2007. NBP0304 was supported by NSF grant OPP-0126334. Subsequent data analysis was supported by NSF grant OPP- 0338317. We thank John Goff and an anonymous reviewer for their thorough and insightful reviews of the manuscript. We also thank J. Stock, S. Cande, and N. Smith-Downey for useful comments. California Institute of Technology Division of Geological and Planetary Sciences, contribution 9153.
Group:Seismological Laboratory
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Subject Keywords:ridgelet transform; abyssal hills.
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Caltech Division of Geological and Planetary Sciences9153
Record Number:CaltechAUTHORS:20121001-102934144
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Official Citation:Downey, N. J., and R. W. Clayton (2007), A ridgelet transform method for constraining tectonic models via abyssal-hill morphology, Geochem. Geophys. Geosyst., 8, Q03004, doi:10.1029/2006GC001440
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34583
Deposited By: Tony Diaz
Deposited On:01 Oct 2012 20:54
Last Modified:04 Oct 2022 14:59

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