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Record #125601:

Micro-earthquakes beneath ice streams B and C, west Antarctica: observations and implications / S. Anandakrishnan, Charles R. Bentley.

Title: Micro-earthquakes beneath ice streams B and C, west Antarctica: observations and implications / S. Anandakrishnan, Charles R. Bentley.
Author(s): Anandakrishnan, S.
Bentley, Charles R.
Date: 1993.
In: Journal of Glaciology. (1993.), Vol. 39(133) (1993)
Abstract: Subglacial micro-earthquakes have been monitored at two locations on Ice Stream B and one on C, using specially built seismographic array. They are 20 times more abundant beneath C than beneath B, despite 100 times more rapid movement of B, and contribute more to motion of ice stream by three orders of magnitude in absolute velocity, which contributes five orders of magnitude more, relative to ice-stream velocity. This result emphasizes importance of basal till in controlling ice-stream flow. Can be presumed that micro-earthquakes were much fewer beneath C when it was active, and that activity has increased as result of decrease in porosity of subglacial till. Implication is that transition of flow of ice stream from fast to slow occurred through dewatering and loss of dilantancy in lubricating till layer.
Notes:

Journal of Glaciology. Vol. 39(133) :455-462 (1993).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.29 -- Land ice, miscellaneous forms.
551.324.54 -- Land ice, flow of particular glaciers.
551.324.05 -- Land ice, effects of exogenous phenomena.
E5 -- Glaciology: land ice.
(*7) -- Antarctic regions.
(*767.3) -- Gould Coast.
(*767.5) -- Siple Coast.
SPRI record no.: 125601

MARCXML

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100 1# ‡aAnandakrishnan, S.
245 10 ‡aMicro-earthquakes beneath ice streams B and C, west Antarctica :‡bobservations and implications /‡cS. Anandakrishnan, Charles R. Bentley.
260 ## ‡a[S.l.] :‡b[s.n.],‡c1993.
300 ## ‡ap. 455-462 :‡bdiags., tables, maps.
500 ## ‡aJournal of Glaciology. Vol. 39(133) :455-462 (1993).
520 3# ‡aSubglacial micro-earthquakes have been monitored at two locations on Ice Stream B and one on C, using specially built seismographic array. They are 20 times more abundant beneath C than beneath B, despite 100 times more rapid movement of B, and contribute more to motion of ice stream by three orders of magnitude in absolute velocity, which contributes five orders of magnitude more, relative to ice-stream velocity. This result emphasizes importance of basal till in controlling ice-stream flow. Can be presumed that micro-earthquakes were much fewer beneath C when it was active, and that activity has increased as result of decrease in porosity of subglacial till. Implication is that transition of flow of ice stream from fast to slow occurred through dewatering and loss of dilantancy in lubricating till layer.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.29 -- Land ice, miscellaneous forms.‡2udc
650 07 ‡a551.324.54 -- Land ice, flow of particular glaciers.‡2udc
650 07 ‡a551.324.05 -- Land ice, effects of exogenous phenomena.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*767.3) -- Gould Coast.‡2udc
651 #7 ‡a(*767.5) -- Siple Coast.‡2udc
700 1# ‡aBentley, Charles R.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 39(133) (1993) ‡wSPRI-20534
917 ## ‡aUnenhanced record from Muscat, imported 2019
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