DOI: 10.1002/2016GL071539
论文题名: The Coriolis effect on mass wasting during the Rheasilvia impact on asteroid Vesta
作者: Otto K.A. ; Jaumann R. ; Krohn K. ; Spahn F. ; Raymond C.A. ; Russell C.T.
刊名: Geophysical Research Letters
ISSN: 0094-8297
EISSN: 1944-8028
出版年: 2016
卷: 43, 期: 24 起始页码: 12340
结束页码: 12347
语种: 英语
英文关键词: asteroid Vesta
; Coriolis effect
; curved radial ridges
; impact cratering
; mass wasting
; modification stage
Scopus关键词: Coriolis force
; Friction
; NASA
; Asteroid vestas
; Coriolis effect
; Curved radial ridges
; Impact cratering
; Mass wasting
; Asteroids
英文摘要: We investigate the influence of the Coriolis force on mass motion related to the Rheasilvia impact on asteroid Vesta. Observations by the NASA Dawn mission revealed a pattern of curved radial ridges, which are related to Coriolis-deflected mass-wasting during the initial modification stage of the crater. Utilizing the projected curvature of the mass-wasting trajectories, we developed a method that enabled investigation of the initial mass wasting of the Rheasilvia impact by observational means. We demonstrate that the Coriolis force can strongly affect the crater formation processes on rapidly rotating objects, and we derive the material's velocities (28.9 ± 22.5 m/s), viscosities (1.5–9.0 × 106 Pa s) and coefficients of friction (0.02–0.81) during the impact modification stage. The duration of the impact modification stage could be estimated to (1.1 ± 0.5) h. By analyzing the velocity distribution with respect to the topography, we deduce that the Rheasilvia impactor hit a heterogeneous target and that the initial crater walls were significantly steeper during the modification stage. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007436487&doi=10.1002%2f2016GL071539&partnerID=40&md5=76325a8845f60b447b47db65fa1b474e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9260
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institute of Planetary Research, Deutsches Zentrum für Luft- und Raumfahrt, Berlin, Germany
Recommended Citation:
Otto K.A.,Jaumann R.,Krohn K.,et al. The Coriolis effect on mass wasting during the Rheasilvia impact on asteroid Vesta[J]. Geophysical Research Letters,2016-01-01,43(24).