| 1. |
|
|
| 2. |
- Arvidsson, R, et al.
(författare)
-
Plate tectonic framework for the October 9, 1996, Cyprus earthquake
- 1998
-
Ingår i: GEOPHYSICAL RESEARCH LETTERS. - : AMER GEOPHYSICAL UNION. - 0094-8276. ; 25:12, s. 2241-2244
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We determine the centroid depths for the M-W = 6.8, October 9, 1996, Cyprus earthquake and its largest aftershock to 32 and 27 km, respectively, by modeling P and SH waveforms. These depths are consistent with shallow subduction as the African plate, west
|
|
| 3. |
- Askebjer, P., et al.
(författare)
-
UV and optical light transmission properties in deep ice at the South Pole
- 1997
-
Ingår i: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 24:11, s. 1355-1358
-
Tidskriftsartikel (refereegranskat)abstract
- Both absorption and scattering of light at wavelengths 410 to 610 nanometers were measured in the South Pole ice at depths 0.8 to 1 kilometer with the laser calibration system of the Antarctic Muon And Neutrino Detector Array (AMANDA). At the shortest wavelengths the absorption lengths exceeded 200 meters - an order of magnitude longer than has been reported for laboratory ice. The absorption shows a strong wavelength dependence while the scattering length is found to be independent of the wavelength, consistent with the hypothesis of a residual density of air bubbles in the ice. The observed linear decrease of the inverse scattering length with depth is compatible with an earlier measurement by the AMANDA collaboration (at ∼515 nanometers).
|
|
| 4. |
- Askebjer, P, et al.
(författare)
-
UV and optical light transmission properties in deep ice at the South Pole
- 1997
-
Ingår i: GEOPHYSICAL RESEARCH LETTERS. - : AMER GEOPHYSICAL UNION. - 0094-8276. ; 24:11, s. 1355-1358
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Both absorption and scattering of light at wavelengths 410 to 610 nanometers were measured in tile South Pole ice at depths 0.8 to 1 kilometer with the laser calibration system of the Antarctic Muon And Neutrino Detector Array (AMANDA). At the shortest wa
|
|
| 5. |
|
|
| 6. |
- Bergbauer, S., et al.
(författare)
-
Thermal stress evolution in cooling pluton environments of different geometries
- 1998
-
Ingår i: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 25:5, s. 707-71-
-
Tidskriftsartikel (refereegranskat)abstract
- Thermoelastic displacement potentials and fast Fourier transforms can be combined to rapidly calculate the thermal stresses in 2-D for plutons that cool by conduction. First, temperature distributions over time are computed by solving the diffusion equation. Thermal stresses are then obtained using thermoelastic stress potentials. This method can be applied to a broad range of pluton geometries and initial conditions, and requires far less computation time than finite difference or finite element analyses. Results of 2-D analyses show that pluton geometry strongly influences the thermal stresses that occur in a cooling pluton. Thermal stresses of several tens of MPa arise during cooling and are highest at the corners or where the intrusion is thin. The most tensile stress is greater inside a pluton than in the host rock. Moreover, the orientation of the most tensile stress in a cooling pluton generally changes over time. This could result in multiple fracture sets, which would significantly affect the mechanical and hydraulic behavior of a pluton.
|
|
| 7. |
- Boehm, M. H., et al.
(författare)
-
Observations of an upward-directed electron beam with the perpendicular temperature of the cold ionosphere
- 1995
-
Ingår i: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 22, s. 2103-2106
-
Tidskriftsartikel (refereegranskat)abstract
- The Freja TESP electron spectrometer has repeatedly observed similar to 100 eV - 1 keV upward-directed, anti-field-aligned electron beams near 1700 km altitude in the auroral zone. A particularly intense event, at energies up to 2 keV, is described. The beam perpendicular temperature T perpendicular to(e)), was as low as 0.1-0.2 eV at 100-200 eV parallel energy. The 10-15 s period of upward fluxes was coincident with a low density (similar to 10 cm(-3)) period and a similar to 5 keV ion conic. Strong low frequency waves and the lack of any downward motion in the simultaneously observed ion conic suggest a strong element of wave acceleration, while electric field and ion loss cone measurements provide limited evidence of potential acceleration to a fraction of the observed energies.
|
|
| 8. |
|
|
| 9. |
- Brandstrom, BUE, et al.
(författare)
-
Unambiguous evidence of HF pump-enhanced airglow at auroral latitudes
- 1999
-
Ingår i: GEOPHYSICAL RESEARCH LETTERS. - : AMER GEOPHYSICAL UNION. - 0094-8276. ; 26:23, s. 3561-3564
-
Tidskriftsartikel (refereegranskat)abstract
- Simultaneous observations by up to three low-light imaging stations belonging to the Auroral Large Imaging System (ALIS) have provided the first strong evidence of high-frequency (HF) pump-enhanced airglow at auroral latitudes. The airglow was enhanced by
|
|
| 10. |
- Buraglio, N, et al.
(författare)
-
Distribution and inventory of I-129 in the central Arctic Ocean
- 1999
-
Ingår i: GEOPHYSICAL RESEARCH LETTERS. - : AMER GEOPHYSICAL UNION. - 0094-8276. ; 26:8, s. 1011-1014
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The concentration of I-129 was measured in water samples from three depth profiles collected in the central Arctic Ocean during 1996. The results indicate >7x10(8) atoms/liter in the cold, low salinity, 100-m-deep surface layer, and 0.06x10(8) atoms/liter
|
|
