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Mobility of large rock avalanches: evidence from Valles Marineris, Mars

Geology

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Abstract

Measurements of H/L (height of drop/length of runout) vs. volume for landslides in Valles Marineris on Mars show a trend of decreasing H/L with increasing volume. This trend, which is linear on a log-log plot, is parallel to but lies above the trend for terrestrial dry rock avalanches. This result and estimates of 104 to 105 Pa yield strength suggest that the landslides were not water saturated, as suggested by previous workers. The offset between the H/L vs. volume trends shows that a typical Martian avalanche must be nearly two orders of magnitude more voluminous than a typical terrestrial avalance in order to achieve the same mobility. This offset might be explained by the effects of gravity on flows with high yield strengths. These results should prove useful to future efforts to resolve the controversy over the mechanics of long-runout avalanches. -Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Mobility of large rock avalanches: evidence from Valles Marineris, Mars
Series title:
Geology
Volume
17
Issue:
12
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1111
Last page:
1114
Number of Pages:
4