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Record #96599:

Calving ice walls / Terence J. Hughes.

Title: Calving ice walls / Terence J. Hughes.
Author(s): Hughes, Terence J.
Date: 1989.
Publisher: Cambridge: International Glaciological Society
In: Annals of Glaciology. (1989.), Vol. 12 (1989)
Abstract: Important ablation mechanism in calving bays, but also exist in subpolar glaciers terminating on dry land where they are safer to study. Describes opportunity for detailed field work afforded by 1970 volcanic eruption on Deception Island, Antarctic Peninsula, where thawing of surface layer of ice-cemented ash produced solifluction ramps that made parts of ice wall accessible. Measurements made in melt-water trough and in four tunnels cut into ice wall revealed numerous shear bands that rose almost vertically and curved forward. Shear offset increased upward and was greatest in shear bands that intersected tips of ring-fault crevasses on up-slope side of ice wall. Near base of ice wall, other shear bands, possibly related to slip-line field, intersected ice wall at about 45°. Ice slabs separated by ring faults calved straight down as result of shear rupture along these two sets of bands. Calving dynamics were analyzed and generalized for ice walls grounded in water.
Notes:

Annals of Glaciology. Vol. 12 :74-80 (1989).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.433 -- Land ice, ablation and calving.
E5 -- Glaciology: land ice.
(*7) -- Antarctic regions.
(*726) -- Maritime Antarctic.
(*726.1) -- South Shetland Islands.
(*726.18) -- Deception Island.
SPRI record no.: 96599

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100 1# ‡aHughes, Terence J.
245 10 ‡aCalving ice walls /‡cTerence J. Hughes.
260 ## ‡aCambridge :‡bInternational Glaciological Society,‡c1989.
300 ## ‡ap. 74-80 :‡bill., diags., table, maps.
500 ## ‡aAnnals of Glaciology. Vol. 12 :74-80 (1989).
520 3# ‡aImportant ablation mechanism in calving bays, but also exist in subpolar glaciers terminating on dry land where they are safer to study. Describes opportunity for detailed field work afforded by 1970 volcanic eruption on Deception Island, Antarctic Peninsula, where thawing of surface layer of ice-cemented ash produced solifluction ramps that made parts of ice wall accessible. Measurements made in melt-water trough and in four tunnels cut into ice wall revealed numerous shear bands that rose almost vertically and curved forward. Shear offset increased upward and was greatest in shear bands that intersected tips of ring-fault crevasses on up-slope side of ice wall. Near base of ice wall, other shear bands, possibly related to slip-line field, intersected ice wall at about 45°. Ice slabs separated by ring faults calved straight down as result of shear rupture along these two sets of bands. Calving dynamics were analyzed and generalized for ice walls grounded in water.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.433 -- Land ice, ablation and calving.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*726) -- Maritime Antarctic.‡2udc
651 #7 ‡a(*726.1) -- South Shetland Islands.‡2udc
651 #7 ‡a(*726.18) -- Deception Island.‡2udc
773 0# ‡7nnas ‡tAnnals of Glaciology. ‡gVol. 12 (1989) ‡wSPRI-60773
917 ## ‡aUnenhanced record from Muscat, imported 2019
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