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Mechanical models of tilted block basins (1989)

H. W. S. McQueen ; C. Beaumont ; Raymond A. Price

AGU

In: Bull., Polar Proj. OP-O3A4, Origin and Evolution of Sedimentary Basins and Their Energy, Washington, D.C., AGU, vol. 48, no. 4, pp. 65-71, (ISBN 0080419208)

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Publication Date: 1989

Keywords: Geol. aspects ; Modelling ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; 8110 ; Tectonophysics ; Continental ; tectonics ; 8165 ; Structural ; geology ; (crustal ; structure ; and ; mechanics) ; 8194 ; Instruments ; and ; techniques

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BIBLIOGRAPHY SEISMOLOGY

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2

Electronic Resource

Determination of crustal structure in central Australia by inversion of traveltime residuals (1996)

McQueen, H. W. S. ; Lambeck, K.

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 126 (1996), S. 0

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ISSN: 1365-246X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: Teleseismic traveltime anomalies for events recorded on portable seismograph arrays across the northern and southern margins of the Amadeus Basin in central Australia are inverted to obtain a picture of the velocity structure at a scale on the order of 5–10 km. A modified sirt algorithm is used to iteratively redistribute traveltime anomalies along incoming ray paths, subject to regularization constraints, to obtain a direct estimate of the lithospheric velocity field beneath the arrays. Model structure is assumed to be 2-D, based on the strong east-west strike of surface geology and gravity structure in the area. Spurious structures commonly generated in sirt inversions are suppressed using a filter based on the density of rays. A weighting towards near-surface structure is also applied to test the robustness of the inference of deep structures.The most prominent feature of the solutions for all three lines is a sharp interface between slow and fast regions, dipping away from the basin and beneath the adjacent basement blocks. The fastest region, on the upper side of the interface, corresponds to a belt of high-grade metamorphic rocks where they crop out at the surface. The interface between slow and fast regions extends to at least 50 km depth in all cases, dipping at about 50–60° on the northern lines and 60–80° on the southern line. On the northern lines the interface can be correlated with the Redbank Thrust identified in deep seismic reflection data, but the velocity interface seems to dip more steeply. Secondary features on the profiles include a possible change in dip of the interface on the southern line and a more complex structure on one of the northern lines, suggesting that one or more steeper faults cut through the hanging wall of the thrust there.Predicted gravity profiles derived from the velocity sections using empirical velocity-density relations resemble observed gravity surprisingly well in their style and approximate magnitude, providing support for the general features of the models. The results are consistent with a thick-skinned thrusting model for the deformation of the central segment of the basin margins and indicate that the style of deformation in the Late Proterozoic-Cambrian compressional event at the southern edge of the Amadeus Basin was similar to that in the later Alice Springs Orogeny in the north.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb04696.x

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The accuracy of some lithospheric bending parameters (1989)

McQueen, H. W. S. ; Lambeck, K.

Oxford, UK : Blackwell Publishing Ltd

Geophysical journal international 96 (1989), S. 0

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ISSN: 1365-246X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: A procedure is described for iterative least-squares inference of bending parameters from lithospheric deflection profiles. The method is applied to several bathymetric profiles seaward of subduction zones and used to study the accuracy with which these parameters and related ones such as plate thickness and moment-curvature relations can be determined. The presence of typical bathymetric undulations, particularly at wavelengths of the order of the flexural wavelength and greater, prevents the inference of effective elastic thickness from single profile data to better than ±12 km (2 σ). Mixing of elastic and inelastic model estimates of effective thickness further increases scatter. It is found that the sensitivity of inferred bending moments on the outer trench wall to typical uncertainties of regional bathymetric slope is substantial and inferred estimates of inelastic behaviour need to be interpreted with caution.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb06004.x

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The effect of electromagnetic attenuation on the spatial spectrum of the geomagnetic field. (1983)

MCQUEEN, H. W. S. ; HAYES, L. M. ; CONLEY, D.

Society of Geomagnetism and Earth, Planetary and Space Sciences

In: Journal of Geomagnetism and Geoelectricity. 1983; 35(4): 103-117. Published 1983 Jan 01. doi: 10.5636/jgg.35.103.

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Publication Date: 1983-01-01

Description: A comparison of the mean energy densities in the different spatial harmonics of the geomagnetic field with the corresponding scale times derived from the secular variation reveals a correlation which may be explained by greater attenuation of faster varying harmonics due to the finite electrical conductivity between the source level in the core and the surface of the earth. The conductivity required for the mantle alone to produce this effect is an order of magnitude too high to allow the observed sudden onset of some events in the surface field. It is found that the correlation may equally well be explained by a layer of core material ~ 10 km thick screening the principal motions responsible for the secular variation. Surface field events with rise times up to several years must then involve a disturbance of this layer or be transported across it as a hydromagnetic wave disturbance. © 1983, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.

Print ISSN: 0022-1392

Topics: Geosciences