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Submitted by shamita650 on May 15, 2005
Category: English
Words: 675 | Pages: 3
Views: 125
Popularity Rank: 87,006
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The position of thrust sheets around
the margins of landslide toe blocks, and their
morphology and direction of thrusting, suggests that
they were formed as a result of toe block pressing and
movement in the surrounding sand. Toe-thrust sheets
therefore can be considered as the morphological
expression of ongoing instability at the landslide
toe. The upthrust nature of these sheets at West
Runton suggests that rotation of toe blocks,
generating forward movement of the surrounding loose
beach sand, is the principal process of toe-thrust
sheet formation (fig. 6). Passive pressing of toe
blocks into the surrounding sand under gravity is
unlikely to result in either brittle failure of the
sand or differential movement of the sand away from
the toe blocks (i.e., different thrust sheet widths).
The presence of thrust sheets therefore suggests that
landslide blocks are actively excavating into the
softer and unconsolidated beach sand that is displaced
outward as a result of this process.
The size and extent of the thrust sheets can be used
as a proxy for the scale, rate, and timing of block
movement. For example, the bigger landslide blocks are
associated with more extensive thrust sheets, and
sheet width is likely associated with excavation
depth. The presence of multiple and overlapping thrust
sheets that vary in extent along the front of
landslide blocks (figs. 4, 5) also suggests that
different parts of the toe are active at different
times and therefore that sliding rates and volumes
averaged across the entire landslide (Waltham and
Dixon 2000) likely conceal wide spatial and temporal
variations.
[Graphic omitted] The presence of delicate toe-thrust
sheets within the intertidal zone at West Runton is of
...
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