Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface

Stickle, Angela M.; Schultz, P. H.; Crawford, D. A.

doi:10.1016/j.icarus.2014.10.002

Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface

Journal Article · Mon Oct 13 00:00:00 EDT 2014 · Icarus

DOI:https://doi.org/10.1016/j.icarus.2014.10.002· OSTI ID:1143511

Stickle, Angela M. ^[1]; Schultz, P. H. ^[1]; Crawford, D. A. ^[2]

Brown Univ., Providence, RI (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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).

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1143511

Alternate ID(s):: OSTI ID: 1434978

Report Number(s):: SAND--2013-10719J; PII: S0019103514005302

Journal Information:: Icarus, Journal Name: Icarus Journal Issue: C Vol. 247; ISSN 0019-1035

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Subsurface failure in spherical bodies. A formation scenario for linear troughs on Vesta’s surface

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