Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation
Long rifts near the front of the Ronne Ice Shelf, Antarctica, are observed to begin as fractures along the lateral boundaries of outlet streams feeding the shelf. These flaws eventually become the planes along which tabular icebergs calve. The fractures propagate laterally as they advect through the...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
PDXScholar
2010
|
Subjects: | |
Online Access: | https://pdxscholar.library.pdx.edu/geology_fac/33 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1032&context=geology_fac |
id |
ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1032 |
---|---|
record_format |
openpolar |
spelling |
ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1032 2023-05-15T13:58:46+02:00 Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation Hulbe, Christina L. LeDoux, Christine Marie Cruikshank, Kenneth M. 2010-01-01T08:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geology_fac/33 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1032&context=geology_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geology_fac/33 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1032&context=geology_fac Geology Faculty Publications and Presentations Glaciology -- Antarctica -- Ronne Ice Shelf Geographic information systems -- Antarctica -- Ronne Ice Shelf MODIS (Spectroradiometer) Fracture mechanics Geology Glaciology text 2010 ftportlandstate 2022-01-09T19:24:25Z Long rifts near the front of the Ronne Ice Shelf, Antarctica, are observed to begin as fractures along the lateral boundaries of outlet streams feeding the shelf. These flaws eventually become the planes along which tabular icebergs calve. The fractures propagate laterally as they advect through the shelf, with orientations that can be explained by the glaciological stress field. Fracture length remains constrained over much of the advective path, and locations of crack tip arrest are observed to coincide with structural boundaries, such as suture zones between ice from adjacent outlet glaciers. Geomechanical principles and numerical models demonstrate that in the absence of these suture zones crack tips are unlikely to arrest in these locations.We conclude that lateral inhomogeneity in the ice plays an important role in fracture mechanics through most of the ice shelf. Only near the shelf front are these local structural effects overcome such that the large rifts required for tabular iceberg production develop. Text Antarc* Antarctica Ice Shelf Ronne Ice Shelf Portland State University: PDXScholar Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
institution |
Open Polar |
collection |
Portland State University: PDXScholar |
op_collection_id |
ftportlandstate |
language |
unknown |
topic |
Glaciology -- Antarctica -- Ronne Ice Shelf Geographic information systems -- Antarctica -- Ronne Ice Shelf MODIS (Spectroradiometer) Fracture mechanics Geology Glaciology |
spellingShingle |
Glaciology -- Antarctica -- Ronne Ice Shelf Geographic information systems -- Antarctica -- Ronne Ice Shelf MODIS (Spectroradiometer) Fracture mechanics Geology Glaciology Hulbe, Christina L. LeDoux, Christine Marie Cruikshank, Kenneth M. Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation |
topic_facet |
Glaciology -- Antarctica -- Ronne Ice Shelf Geographic information systems -- Antarctica -- Ronne Ice Shelf MODIS (Spectroradiometer) Fracture mechanics Geology Glaciology |
description |
Long rifts near the front of the Ronne Ice Shelf, Antarctica, are observed to begin as fractures along the lateral boundaries of outlet streams feeding the shelf. These flaws eventually become the planes along which tabular icebergs calve. The fractures propagate laterally as they advect through the shelf, with orientations that can be explained by the glaciological stress field. Fracture length remains constrained over much of the advective path, and locations of crack tip arrest are observed to coincide with structural boundaries, such as suture zones between ice from adjacent outlet glaciers. Geomechanical principles and numerical models demonstrate that in the absence of these suture zones crack tips are unlikely to arrest in these locations.We conclude that lateral inhomogeneity in the ice plays an important role in fracture mechanics through most of the ice shelf. Only near the shelf front are these local structural effects overcome such that the large rifts required for tabular iceberg production develop. |
format |
Text |
author |
Hulbe, Christina L. LeDoux, Christine Marie Cruikshank, Kenneth M. |
author_facet |
Hulbe, Christina L. LeDoux, Christine Marie Cruikshank, Kenneth M. |
author_sort |
Hulbe, Christina L. |
title |
Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation |
title_short |
Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation |
title_full |
Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation |
title_fullStr |
Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation |
title_full_unstemmed |
Propagation of long fractures in the Ronne Ice Shelf investigated using a numerical model of fracture propagation |
title_sort |
propagation of long fractures in the ronne ice shelf investigated using a numerical model of fracture propagation |
publisher |
PDXScholar |
publishDate |
2010 |
url |
https://pdxscholar.library.pdx.edu/geology_fac/33 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1032&context=geology_fac |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Ronne Ice Shelf |
geographic_facet |
Ronne Ice Shelf |
genre |
Antarc* Antarctica Ice Shelf Ronne Ice Shelf |
genre_facet |
Antarc* Antarctica Ice Shelf Ronne Ice Shelf |
op_source |
Geology Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geology_fac/33 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1032&context=geology_fac |
_version_ |
1766267103152701440 |