Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface
Abstract
Many asteroids in the Solar System exhibit unusual, linear features on their surface. The Dawn mission recently observed two sets of linear features on the surface of the asteroid 4 Vesta. Geologic observations indicate that these features are related to the two large impact basins at the south pole of Vesta, though no specific mechanism of origin has been determined. Furthermore, the orientation of the features is offset from the center of the basins. Experimental and numerical results reveal that the offset angle is a natural consequence of oblique impacts into a spherical target. We demonstrate that a set of shear planes develops in the subsurface of the body opposite to the point of first contact. Moreover, these subsurface failure zones then propagate to the surface under combined tensile-shear stress fields after the impact to create sets of approximately linear faults on the surface. Comparison between the orientation of damage structures in the laboratory and failure regions within Vesta can be used to constrain impact parameters (e.g., the approximate impact point and likely impact trajectory).
- Authors:
-
- Brown Univ., Providence, RI (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1143511
- Alternate Identifier(s):
- OSTI ID: 1434978
- Report Number(s):
- SAND-2013-10719J
Journal ID: ISSN 0019-1035; PII: S0019103514005302
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Icarus
- Additional Journal Information:
- Journal Volume: 247; Journal Issue: C; Journal ID: ISSN 0019-1035
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; asteroid vesta; impact processes; cratering
Citation Formats
Stickle, Angela M., Schultz, P. H., and Crawford, D. A. Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface. United States: N. p., 2014.
Web. doi:10.1016/j.icarus.2014.10.002.
Stickle, Angela M., Schultz, P. H., & Crawford, D. A. Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface. United States. https://doi.org/10.1016/j.icarus.2014.10.002
Stickle, Angela M., Schultz, P. H., and Crawford, D. A. Mon .
"Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface". United States. https://doi.org/10.1016/j.icarus.2014.10.002. https://www.osti.gov/servlets/purl/1143511.
@article{osti_1143511,
title = {Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface},
author = {Stickle, Angela M. and Schultz, P. H. and Crawford, D. A.},
abstractNote = {Many asteroids in the Solar System exhibit unusual, linear features on their surface. The Dawn mission recently observed two sets of linear features on the surface of the asteroid 4 Vesta. Geologic observations indicate that these features are related to the two large impact basins at the south pole of Vesta, though no specific mechanism of origin has been determined. Furthermore, the orientation of the features is offset from the center of the basins. Experimental and numerical results reveal that the offset angle is a natural consequence of oblique impacts into a spherical target. We demonstrate that a set of shear planes develops in the subsurface of the body opposite to the point of first contact. Moreover, these subsurface failure zones then propagate to the surface under combined tensile-shear stress fields after the impact to create sets of approximately linear faults on the surface. Comparison between the orientation of damage structures in the laboratory and failure regions within Vesta can be used to constrain impact parameters (e.g., the approximate impact point and likely impact trajectory).},
doi = {10.1016/j.icarus.2014.10.002},
journal = {Icarus},
number = C,
volume = 247,
place = {United States},
year = {Mon Oct 13 00:00:00 EDT 2014},
month = {Mon Oct 13 00:00:00 EDT 2014}
}
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