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The 1993-1995 surge and foreland modification, Bering Glacier, Alaska

Lookup NU author(s): Professor Andrew RussellORCiD


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A 25-30 yr surge cycle anticipated by Post (1972) was confirmed by the 1993-1995 surge, although the advance culminated more than a kilometer short of the 1965-1967 surge limit. During the initial 6 mo. of the 1993-1995 surge the eastern terminus of the Bering Glacier Piedmont Lobe advanced 1.0-1.5 km at a rate that varied between 1.0-7.4 m/d, and thickened by an estimated 125-150 m. One year after the surge began an outburst of pressured subglacial water temporarily interrupted basal sliding and slowed ice front advance. Within days gravel and blocks of ice transported and deposited by that flood partially filled an ice-contact lake, forming a 1.5 km2 sandur. During the next few months a second outburst nearly dissected a foreland island with the resulting construction of two additional sandar, each nearly 1 km2. Both outburst sites coincided with a subglacial conduit system that has persisted for decades and survived two surges. When the surge resumed, advance was intermittent and slower. A prominent push moraine marks the limit of ice advance on the eastern sector. Although basal sliding across a saturated substrate was a major contributor to surge-related changes along the eastern sector, the most profound foreland altera. © 2010 The Geological Society of America.

Publication metadata

Author(s): Fleisher P, Bailey P, Natel E, Muller E, Cadwell D, Russell A

Publication type: Article

Publication status: Published

Journal: Special Paper of the Geological Society of America

Year: 2010

Issue: 462

Pages: 193-216

Print publication date: 01/01/2010

ISSN (print): 0072-1077

ISSN (electronic):

Publisher: Geological Society of America


DOI: 10.1130/2010.2462(10)


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