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torsion

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Journal Article
Journal: Interpretation
Published: 15 October 2014
Interpretation (2014) 2 (4): SJ103–SJ115.
... model of the Wathlingen salt dome, situated in the southern part of the Northwest German Basin from joint modeling of reprocessed torsion balance measurements. Gravity, gravity gradients W z x and W z y , curvature derived from horizontal gravity gradients W x y , and horizontal directive tendency...
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Journal Article
Published: 01 May 2013
European Journal of Mineralogy (2013) 25 (2): 145–153.
...Patrick Cordier; Florian Heidelbach Abstract Two twisted quartz crystals (gwindels) from the Alps were studied by transmission electron microscopy and large-angle convergent-beam electron diffraction (LACBED) to elucidate the twist mechanism. We found that torsion results from a distribution...
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Journal Article
Journal: Geology
Published: 01 July 2012
Geology (2012) 40 (7): 611–614.
... the brittle failure of silicate melts is reasonably well characterized, the effect of crystals on the viscous-brittle transition has not yet been constrained. Here we examine the effect of suspended crystals on the mechanical failure of magmas using torsion experiments performed at temperatures (600–900 °C...
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Journal Article
Journal: Geology
Published: 01 August 2011
Geology (2011) 39 (8): 715–718.
... to shear. Shear, in turn, enhances complex fabrics that result from the reorganization of the different phases (crystals, gas, melt). Such fabrics have not yet been evaluated experimentally on a three-phase system. We performed torsion experiments on a synthetic crystal-rich hydrous magma at subsolidus...
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Journal Article
Published: 01 June 2011
European Journal of Mineralogy (2011) 23 (3): 293–302.
...Heinrich Siemes; Erik Rybacki; Birgit Klingenberg; Carlos Alberto Rosière Abstract A series of hematite samples (>98 % Fe 2 O 3, Sishen Mine, South Africa) with different initial grain sizes of <5 μm, ≈7 μm, and ≈17 μm and an almost random texture were deformed in large-strain torsion...
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Journal Article
Published: 01 May 2009
Bulletin of the Seismological Society of America (2009) 99 (2B): 1271–1286.
... 2008 A direct observation of earthquake-induced rotational ground motion is possible using devices sensitive to torsion such as tilt meters or, more recently, solid-state devices ( Nigbor, 1994 ), ring lasers ( Stedman et al. , 1995 ), and broadband rotation meters ( Lin et al. , 2009...
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Journal Article
Published: 01 May 2009
Bulletin of the Seismological Society of America (2009) 99 (2B): 1378–1390.
...V. W. Lee; M. D. Trifunac Abstract Many empirical scaling equations have been developed for scaling Fourier spectrum amplitudes of strong earthquake accelerations and for generation of artificial strong-motion accelerograms for the translational, torsional, and rocking components of strong motion...
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Journal Article
Published: 01 August 2008
Bulletin of the Seismological Society of America (2008) 98 (4): 1898–1914.
... occupying an area of about 1 km 2 located 8.8 km from the San Andreas fault. Peak horizontal acceleration and velocity at UPSAR during the mainshock were 0.45 g and 27 cm/sec, respectively. We determined both time-varying and peak values of ground dilatations, shear strains, torsions, tilts, torsion rates...
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Journal Article
Journal: Geophysics
Published: 13 October 2006
Geophysics (2006) 71 (6): F147–F159.
...Cao Lu; Ian Jackson Abstract Torsional forced-oscillation techniques have been used to measure the shear modulus and strain-energy dissipation on cylindrical specimens of a fine-grained granite, Delegate aplite. The specimens were subjected to thermal cycling and associated microcracking under...
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Journal Article
Journal: The Leading Edge
Published: 01 January 2005
The Leading Edge (2005) 24 (Supplement): S72–S78.
...) New computer technology (optical, molecular, DNA, and quantum computers?) In 1930 the new field of exploration geophysics vis-à-vis petroleum was undergoing major changes. The first discovery of an oil field by geophysical methods (1924) was the use of the Eötvös torsion balance to map...
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Journal Article
Published: 01 December 2003
Bulletin of the Seismological Society of America (2003) 93 (6): 2516–2530.
...Robert Henke; Wanda K. Henke Abstract This article discusses selected issues addressed by a 2002 field torsional cylindrical impulse shear testing program carried out at the National Geotechnical Experimentation Site on Treasure Island in the San Francisco Bay. The impulse shear test is a new...
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Journal Article
Journal: Geophysics
Published: 01 January 2001
Geophysics (2001) 66 (2): 527–534.
...Clive C. Speake; G. D. Hammond; C. Trenkel Abstract We discuss whether the torsion balance can again become a key tool for geophysical prospecting. We outline the acknowledged disadvantages of the Eötvös torsion balance and seek designs of a torsion balance beam that would enable the torsion...
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Journal Article
Journal: Paleobiology
Published: 01 October 1998
Paleobiology (1998) 24 (4): 450–469.
... a causal link between general hindlimb kinematics, bone strains, and limb bone morphology among these taxa. A model is proposed that relates the amount of torsional loading in femora to bone orientation, such that torsion is maximal in horizontal femora and minimal in vertical femora. Since bone safety...
Journal Article
Journal: Geology
Published: 01 March 1987
Geology (1987) 15 (3): 225–228.
...I. Mariolakos; S. C. Stiros Abstract Interdisciplinary data suggest that the Quaternary, late Holocene, and present-day deformation patterns of the Isthmus of Corinthos, Greece, are very similar and can be compared to a platelike body under torsion. This hypothesis is consistent with the vertical...
Journal Article
Journal: Geophysics
Published: 01 November 1983
Geophysics (1983) 48 (11): 1453–1467.
...Geoffrey A. Dorn Abstract The radiation impedance of a circular disk vibrating torsionally on an anelastic half-space has resonance peaks with a spacing that is a function of the ratio between baseplate radius and seismic wavelength. The presence of a surface layer produces an impedance curve which...
Journal Article
Journal: Geophysics
Published: 01 November 1981
Geophysics (1981) 46 (11): 1607–1608.
Journal Article
Journal: Geophysics
Published: 01 July 1940
Geophysics (1940) 5 (3): 295–306.
...Harold H. Pentz Abstract Curves and formulas for the interpretation of the two-dimensional "dike" and "step" are given because they offer an easy, rapid method of solving all cases to which they apply. Horizontal and vertical polarization of the bodies are considered. This method applies to torsion...
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1931
AAPG Bulletin (1931) 15 (12): 1419–1429.
...Robert H. Miller ABSTRACT The writer discusses torsion-balance results obtained in the Los Angeles basin. It is shown that here the distribution of gravity which is observed in the vicinity of an oil field is in no way connected with the inherent density of the beds. One phase of the mathematical...
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Journal Article
Journal: AAPG Bulletin
Published: 01 September 1930
AAPG Bulletin (1930) 14 (9): 1221–1224.
...J. G. Koenigsberger © 1930 American Association of Petroleum Geologists. All rights reserved 1930 American Association of Petroleum Geologists Donald C. Barton has given an exact, very good control and adjustment of surveys made with magnetometer or with torsion balance, 1 based...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 1929
AAPG Bulletin (1929) 13 (7): 763–778.
...Donald C. Barton ABSTRACT These tables of terrane effects have been devised for use in routine commercial surveys with the torsion balance in areas of moderate relief, and for that purpose, they are a slight refinement and improvement over the graphical methods of the calculation of the terrane...
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