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Three-dimensional joint inversion of traveltime and gravity data across the Chicxulub impact crater

Vermeesch, P.M., Morgan, J.V., Christeson, G.L., Barton, P.J. and Surendra, A. (2009) Three-dimensional joint inversion of traveltime and gravity data across the Chicxulub impact crater Journal of Geophysical Research, 114, (B2), B02105. (doi:10.1029/2008JB005776).

Record type: Article


In 2005 an extensive new seismic refraction data set was acquired over the central part of the Chicxulub impact crater, allowing us to image its structure with much better resolution than before. However, models derived from traveltime data are limited by the available ray coverage and the nonuniqueness that is inherent to all geophysical methods. Therefore, many different models can fit the data equally well. To address these issues, we have developed a new method to simultaneously invert traveltime and gravity data to obtain an integrated model. To convert velocity to density, we use a linear relationship derived from measurements on core from the Chicxulub impact basin, thus providing a reliable conversion equation that is typical for lithologies of the central part of this crater. Prior to utilizing the inversion on the observed data, we have run a suite of tests to establish the optimum weighting between traveltime and gravity constraints, using a synthetic model of central crater structure and the real experimental geometry. These synthetic tests indicate which inversion parameters lead to the best recovery of subsurface structure, as well as which parts of the model are well resolved. We applied the method to all existing gravity data and to seismic refraction data acquired in 1996 and the new, higher-resolution seismic refraction data acquired in 2005. We favor the traveltime model wherever we have sufficient ray coverage and the joint model where we have no ray coverage.

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Submitted date: 10 December 2008
Published date: 18 February 2009
Keywords: Chicxulub, joint inversion, impact


Local EPrints ID: 64288
ISSN: 0148-0227
PURE UUID: 9e7f48cc-7867-41e9-9939-e8d47fceaae4

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Date deposited: 05 Jan 2009
Last modified: 17 Jul 2017 14:13

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Author: P.M. Vermeesch
Author: J.V. Morgan
Author: G.L. Christeson
Author: P.J. Barton
Author: A. Surendra

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