A note on estimating Te from Bouguer coherence

McKenzie, Dan (2016) A note on estimating Te from Bouguer coherence. GEM - International Journal on Geomathematics, 7 (1). pp. 103-116. ISSN 1869-2672 DOI 10.1007/s13137-015-0078-4

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Abstract

The coherence between Bouguer gravity anomalies and topography is widely used to estimate the value of Te, the effective elastic thickness of the lithosphere. In areas where there is little topography but substantial free air gravity anomalies there is often little coherence between the free air anomalies and topography. In such regions the Bouguer coherence method generally gives estimates of Te of 90 km or more. A detailed analysis shows that, under these conditions, the value of the Bouguer coherence γ2b is entirely controlled by the ratio of the power spectra of the free air gravity anomalies and the uncompensated topography, and contains no information about the value of Te. What is worse, under these circumstances the variation of γ2b with wavelength closely resembles that expected for large values of Te. These results show that neither the Bouguer coherence method nor the admittance method can produce meaningful estimates of Te when the free air gravity anomalies are incoherent with the topography.

Item Type:	Article
Uncontrolled Keywords:	2015AREP; IA70; weekly list
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title:	GEM - International Journal on Geomathematics
Volume:	7
Page Range:	pp. 103-116
Identification Number:	10.1007/s13137-015-0078-4
Depositing User:	Sarah Humbert
Date Deposited:	01 Apr 2016 21:06
Last Modified:	15 Jul 2016 00:00
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3596

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