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Geology: Recent submissions
Now showing items 261-280 of 480
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Decadal-scale variations in ice flow along Whillans Ice Stream and its tributaries, West Antarctica
(International Glaciological Society, 2005-01-01)We investigate velocity changes occurring along Whillans Ice Stream (WIS) by comparing velocities derived from repeat aerial photographs acquired in 1985–89 (average date of 1987) to interferometric satellite radar (InSAR) ... -
Controls on the recent speed-up of Jakobshavn Isbræ, West Greenland
(International Glaciological Society, 2011-09-01)Jakobshavn Isbrae, West Greenland, underwent a large, rapid and not well understood change in flow dynamics in 1998, leading to a doubling of its ice discharge rates. We calculate the width-averaged forces controlling flow ... -
Recurring dynamically-induced thinning during 1985-2010 on Upernavik Isstrøm, West Greenland
(American Geophysical Union, 2013-02-14)1] Many glaciers along the southeast and northwest coasts of Greenland have accelerated, increasing the ice sheet's contribution to global sea-level rise. In this article, we map elevation changes on Upernavik Isstrøm (UI), ... -
Spatial and temporal melt variability at Helheim Glacier, East Greenland, and its effect on ice dynamics
(American Geophysical Union, 2010-12-29)[1] Understanding the behavior of large outlet glaciers draining the Greenland Ice Sheet is critical for assessing the impact of climate change on sea level rise. The flow of marine-terminating outlet glaciers is partly ... -
Sudden increase in tidal response linked to calving and acceleration at a large Greenland outlet glacier
(American Geophysical Union, 2010-06-23)[1] Large calving events at Greenland's largest outlet glaciers are associated with glacial earthquakes and near-instantaneous increases in glacier flow speed. At some glaciers and ice streams, flow is also modulated in a ... -
Step-wise changes in glacier flow speed coincide with calving and glacial earthquakes at Helheim Glacier, Greenland
(American Geophysical Union, 2008-12-30)[1] Geodetic observations show several large, sudden increases in flow speed at Helheim Glacier, one of Greenland's largest outlet glaciers, during summer, 2007. These step-like accelerations, detected along the length of ... -
Rapid volume loss from two East Greenland outlet glaciers quantified using repeat stereo satellite imagery
(American Geophysical Union, 2007-03-14)[1] The coastal portions of Kangerdlugssuaq and Helheim glaciers in southeast Greenland lost at least 51 ± 8 km3 yr−1 of ice between 2001–2006 due to thinning and retreat, according to an analysis of sequential digital ... -
Elastic uplift in southeast Greenland due to rapid ice mass loss
(American Geophysical Union, 2007-11-01)[1] The rapid unloading of ice from the southeastern sector of the Greenland ice sheet between 2001 and 2006 caused an elastic uplift of ∼35 mm at a GPS site in Kulusuk. Most of the uplift results from ice dynamic-induced ... -
Spatial patterns in mass balance of the Siple Coast and Amundsen Sea sectors of the West Antarctic Ice Sheet
(International Glaciological Society, 2005-06-01)Local rates of change in ice-sheet thickness were calculated at 15 sites in West Antarctica using the submergence velocity technique. This method entails a comparison of the vertical velocity of the ice sheet, measured ... -
Multi-decadal record of ice dynamics on Daugaard Jensen Gletscher, East Greenland, from satellite imagery and terrestrial measurements
(International Glaciological Society, 2005-08-01)The history of ice velocity and calving front position of Daugaard Jensen Gletscher, a large outlet glacier in East Greenland, is reconstructed from field measurements, aerial photography and satellite imagery for the ... -
Mass balance of four East Antarctic outlet glaciers
(International Glaciological Society, 2011-12-01)The East Antarctic ice sheet (EAIS) is Earth's largest reservoir of fresh water and has the potential to raise sea level by 50 m. A significant amount of the ice sheet's mass is discharged by outlet glaciers draining through ... -
A new velocity map for Byrd Glacier, East Antarctica, derived from high-resolution satellite imagery
(International Glaciological Society, 2005-06-01)New ice-velocity measurements are obtained for the main trunk of Byrd Glacier, East Antarctica, using recently acquired Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery. The velocities are ... -
Alteration of hyaloclastites in the HSDP 2 Phase 1 Drill Core 1. Description and paragenesis
(Chinese Geophysical Society, 2003-05)The core from the Hawaii Scientific Drilling Project 2 Phase 1 provides a unique opportunity for studying the low-temperature alteration processes affecting basalt in suboceanic-island environments. In hyaloclastites, which ... -
The Mount Perkins block, northwestern Arizona: An exposed cross section of an evolving, preextensional to synextensional magmatic system
(American Geophysical Union, 1995-08-10)The steeply tilted Mount Perkins block, northwestern Arizona, exposes a cross section of a magmatic system that evolved through the onset of regional extension. New 40Ar/39Ar ages of variably tilted (0–90°) volcanic strata ... -
Structure and evolution of the East Sierran thrust system, east central California
(American Geophysical Union, 2004-08)A belt of arc-parallel, northeast vergent contractional deformation, the East Sierran thrust system (ESTS), crops out for ∼150 km along the east side of the Sierran continental margin arc. The ESTS is nowhere wider than ... -
Structural discordance between neogene detachments and frontal sevier thrusts, central Mormon Mountains, southern Nevada
(American Geophysical Union, 1985-02)Detailed geologic mapping in the Mormon Mountains of southern Nevada provides significant insight into processes of extensional tectonics developed within older compressional orogens. A newly discovered, WSW-directed ... -
Relations between hinterland and foreland shortening: Sevier orogeny, central North American Cordillera
(American Geophysical Union, 2000-12)The tectonic relations between foreland and hinterland deformation in noncollisional orogens are critical to understanding the overall development of orogens. The classic central Cordilleran foreland fold-and-thrust belt ... -
Petrologic constraints on the unroofing history of the Funeral Mountain Metamorphic Core Complex, California
(American Geophysical Union, 1990-06-10)Get PDF (1026K) Get at KU The northern Funeral Mountains, southeastern California, comprise a metamorphic core complex that lies within a region of extreme Neogene extension but did not experience a significant ... -
Miocene unroofing of the Canyon Range during extension along the Sevier Desert Detachment, west central Utah
(American Geophysical Union, 2001-06)Apatite fission track results from Neoproterozoic and Lower Cambrian quartzites collected from the Canyon Range in west central Utah reveal a significant early to middle Miocene cooling event (∼19–15 Ma). Preextensional ... -
Lead isotopic evidence for synextensional lithospheric ductile flow in the Colorado River extensional corridor, western United States
(American Geophysical Union, 1998-02-10)Temporal changes in the Pb isotopic compositions of Miocene lavas erupted in the northern Colorado River extensional corridor suggest that lithospheric mantle and middle to deep crust migrated from beneath the Colorado ...