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Author |
Dufeu M. |
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1999 |
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136 |
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yes |
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501 |
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Author |
Raymond C.A. & Giret A. |
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Title |
Southern Ocean Evolution: Introduction. |
Type |
Journal Article |
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Year |
1997 |
Publication |
Terra antarctica |
Abbreviated Journal |
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Volume |
3 |
Issue |
2 |
Pages |
650-652 |
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251 |
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Bachelor's thesis |
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1122-8628 |
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yes |
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502 |
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Author |
Trouvilliez A. |
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Report |
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Year |
2010 |
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1013 |
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Bachelor's thesis |
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yes |
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503 |
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Author |
Bureau Central De Magnetisme Terrestre |
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Journal Article |
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Year |
1995 |
Publication |
Bulletin |
Abbreviated Journal |
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Volume |
5 |
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139 |
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yes |
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504 |
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Author |
Gusmeroli Alessio, Pettit Erin C, Kennedy Joseph H, Ritz Catherine, |
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Title |
The crystal fabric of ice from full-waveform borehole sonic logging
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Type |
Journal Article |
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Year |
2012 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
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Volume |
117 |
Issue |
F3 |
Pages |
F03021- |
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Keywords |
Ice anisotropy, borehole sonic logging, ice crystal fabric, 0726 Cryosphere: Ice sheets, 0915 Exploration Geophysics: Downhole methods, 0935 Exploration Geophysics: Seismic methods (3025, 7294), |
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Abstract |
In an ice sheet, a preferred crystal orientation fabric affects deformation rates because ice crystals are strongly anisotropic: shear along the basal plane is significantly easier than shear perpendicular to the basal plane. The effect of fabric can be as important as temperature in defining deformation rates. Fabric is typically measured using analysis of thin sections under the microscope with co-polarized light. Due to the time-consuming and destructive nature of these measurements, however, it is difficult to capture the spatial variation in fabric necessary for evincing ice sheet flow patterns. Because an ice crystal is similarly elastically anisotropic, the speed of elastic waves through ice can be used as a proxy for quantify anisotropy. We use borehole sonic logging measurements and thin section data from Dome C, East Antarctica to define the relations between apparent fabric and borehole measured elastic speeds (compressional VP and vertically polarized shear VSV). These relations, valid for single maximum fabrics, allow in-situ, depth-continuous fabric estimates of unimodal fabric strength from borehole sonic logging. We describe the single maximum fabric using a1: the largest eigenvalue of the second-order orientation tensor. For ice at -16C and a1 in the 0.7-1 range the relations are VP = 248 a13.7 + 3755 m s-1 and VSV = -210a17.3 + 1968 m s-1.
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902 |
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AGU |
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ISSN |
0148-0227 |
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yes |
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Serial |
505 |
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Author |
Guinet C., Jouventin P. & Weimerskirch H. |
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Journal Article |
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Year |
1999 |
Publication |
Antarctic science |
Abbreviated Journal |
Antarct. Sci. |
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Volume |
11 |
Issue |
2 |
Pages |
193-197 |
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Programme |
109 |
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ISSN |
0954-1020 |
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yes |
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Serial |
506 |
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Author |
Iyemori T., Araki T., Kamei T. & Takeda M. |
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Title |
Mid-latitude geomagnetic indices ASY and SYM. |
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Journal Article |
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Year |
1997 |
Publication |
Data Analysis Center for Geomagnetic and Space Magnetism |
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Volume |
7 |
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Abstract |
Publication annuelle du Data Analysis Center for Geomagnetic and Space Magnetism |
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139 |
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yes |
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Serial |
507 |
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Author |
Cherel Y., Verdon C. & Ridoux V. |
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Title |
Seasonal importance of oceanic myctophids in king penguin diet at Crozet Islands. |
Type |
Journal Article |
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Year |
1993 |
Publication |
Polar biology |
Abbreviated Journal |
Polar Biol. |
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Volume |
13 |
Issue |
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Pages |
355-357 |
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137 |
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0722-4060 |
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yes |
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Serial |
508 |
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Author |
Roult Genevieve, Montagner Jean-Paul, Romanowicz Barbara, Cara Michel, Rouland Daniel, Pillet Robert, Karczewski Jean-Francois, Rivera Luis, Stutzmann Eleonore, Maggi Alessia, the GEOSCOPE team, |
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Title |
The GEOSCOPE Program: Progress and Challenges during the Past 30 Years
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Journal Article |
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Year |
2010 |
Publication |
Seismological Research Letters |
Abbreviated Journal |
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Volume |
81 |
Issue |
3 |
Pages |
427 -452 |
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133 |
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0895-0695 |
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509 |
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Author |
Giret A. |
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Journal Article |
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Year |
1993 |
Publication |
Memoires de la societe geologique de france |
Abbreviated Journal |
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Volume |
163 |
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273-282 |
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251 |
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0249-7549 |
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yes |
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Call Number |
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Serial |
510 |
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