Ice Stream C, Antarctica, sticky spots detected by microearthquake monitoring

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Microearthquakes at the base of slow-moving Ice Stream C occur many times more frequently than at the base of fast-moving Ice Stream B. We suggest that the microearthquake source sites are so-called "sticky spots', defined as limited zones of stronger subglacial material interspersed within a weaker matrix. The fault-plane area of the microearthquakes (O(102m2)) is therefore a measure of the size of the sticky spots. The spatial density of the microearthquakes (O(10km-2)) is a measure of the distribution of sticky spots. The average stress drop associated with these microearthquakes is consistent with an ice-stream bed model of weak subglacial till interspersed with stronger zones that support much or all of the basal shear stress. -from Authors

Original languageEnglish (US)
Pages (from-to)183-186
Number of pages4
JournalAnnals of Glaciology
Volume20
StatePublished - Jan 1 1994

Fingerprint

ice stream
microearthquake
monitoring
stream bed
fault plane
shear stress
Antarctica
matrix

All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes

Cite this

@article{f1f4015677d846399d205d1a6958d23c,
title = "Ice Stream C, Antarctica, sticky spots detected by microearthquake monitoring",
abstract = "Microearthquakes at the base of slow-moving Ice Stream C occur many times more frequently than at the base of fast-moving Ice Stream B. We suggest that the microearthquake source sites are so-called {"}sticky spots', defined as limited zones of stronger subglacial material interspersed within a weaker matrix. The fault-plane area of the microearthquakes (O(102m2)) is therefore a measure of the size of the sticky spots. The spatial density of the microearthquakes (O(10km-2)) is a measure of the distribution of sticky spots. The average stress drop associated with these microearthquakes is consistent with an ice-stream bed model of weak subglacial till interspersed with stronger zones that support much or all of the basal shear stress. -from Authors",
author = "Sridhar Anandakrishnan and Alley, {Richard B.}",
year = "1994",
month = "1",
day = "1",
language = "English (US)",
volume = "20",
pages = "183--186",
journal = "Annals of Glaciology",
issn = "0260-3055",
publisher = "International Glaciology Society",

}

Ice Stream C, Antarctica, sticky spots detected by microearthquake monitoring. / Anandakrishnan, Sridhar; Alley, Richard B.

In: Annals of Glaciology, Vol. 20, 01.01.1994, p. 183-186.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ice Stream C, Antarctica, sticky spots detected by microearthquake monitoring

AU - Anandakrishnan, Sridhar

AU - Alley, Richard B.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - Microearthquakes at the base of slow-moving Ice Stream C occur many times more frequently than at the base of fast-moving Ice Stream B. We suggest that the microearthquake source sites are so-called "sticky spots', defined as limited zones of stronger subglacial material interspersed within a weaker matrix. The fault-plane area of the microearthquakes (O(102m2)) is therefore a measure of the size of the sticky spots. The spatial density of the microearthquakes (O(10km-2)) is a measure of the distribution of sticky spots. The average stress drop associated with these microearthquakes is consistent with an ice-stream bed model of weak subglacial till interspersed with stronger zones that support much or all of the basal shear stress. -from Authors

AB - Microearthquakes at the base of slow-moving Ice Stream C occur many times more frequently than at the base of fast-moving Ice Stream B. We suggest that the microearthquake source sites are so-called "sticky spots', defined as limited zones of stronger subglacial material interspersed within a weaker matrix. The fault-plane area of the microearthquakes (O(102m2)) is therefore a measure of the size of the sticky spots. The spatial density of the microearthquakes (O(10km-2)) is a measure of the distribution of sticky spots. The average stress drop associated with these microearthquakes is consistent with an ice-stream bed model of weak subglacial till interspersed with stronger zones that support much or all of the basal shear stress. -from Authors

UR - http://www.scopus.com/inward/record.url?scp=0028562435&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028562435&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0028562435

VL - 20

SP - 183

EP - 186

JO - Annals of Glaciology

JF - Annals of Glaciology

SN - 0260-3055

ER -