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Active Boulder Movement at High Martian Latitudes
Colin M Dundas1, Michael T Mellon2, Susan J Conway3
1U.S. Geological Survey Astrogeology Science Center Flagstaff AZ USA.
Geophysical Research Letters
|August 20, 2019
Summary
Active boulder movement on Martian slopes suggests lobate landforms may be actively forming. This newly discovered process could be a significant factor in Martian slope erosion, potentially occurring without liquid water.
Area of Science:
- Planetary Science
- Geology
- Mars Exploration
Background:
- Lobate stony landforms are observed on steep, high-latitude Martian slopes.
- The processes shaping these landforms and Martian slopes are not fully understood.
Purpose of the Study:
- To investigate active geological processes on Martian slopes.
- To determine if boulder movement is occurring at lobate landform sites.
Main Methods:
- Analysis of high-resolution imagery from Mars orbiters.
- Identification and tracking of submeter-scale boulder displacements over time.
Main Results:
- Demonstrated active boulder movement at seven distinct lobate landform sites.
- Observed frequent boulder displacements of several meters, concentrated near lobate features but also on other slopes.
- Identified a common style of slope activity on Mars.
Conclusions:
- Active boulder movement is a widespread phenomenon on Martian slopes, contributing to slope degradation.
- Lobate landforms may be currently forming through mechanisms that do not require significant liquid water.
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