The Rocky-Like Behavior of Cometary Landslides on 67P/Churyumov-Gerasimenko

DOI: 
10.1029/2019GL085132
Publication date: 
31/12/2019
Main author: 
Lucchetti A.
IAA authors: 
Gutiérrez, P.;Lara, L.;Moreno, J.L.
Authors: 
Lucchetti A., Penasa L., Pajola M., Massironi M., Brunetti M.T., Cremonese G., Oklay N., Vincent J.-B., Mottola S., Fornasier S., Sierks H., Naletto G., Lamy P.L., Rodrigo R., Koschny D., Davidsson B., Barbieri C., Barucci M.A., Bertaux J.-L., Bertini I., Bodewits D., Cambianica P., Da Deppo V., Debei S., De Cecco M., Deller J., Ferrari S., Ferri F., Franceschi M., Fulle M., Gutiérrez P., Güttler C., Ip W.-H., Keller U., Lara L., Lazzarin M., Moreno J.L., Marzari F., Tubiana C.
Journal: 
Geophysical Research Letters
Refereed: 
Yes
Publication type: 
Article
Volume: 
46
Pages: 
14336-14346
Issue: 
24
Abstract: 
Landslides have been identified on several solar system bodies, and different mechanisms have been proposed to explain their runout length. We analyze images from the Rosetta mission and report the global characterization of such features on comet 67P/Churyumov-Gerasimenko's surface. By assuming the height to runout length as an approximation for the friction coefficient of landslide material, we find that on comet 67P, this ratio falls between 0.50 and 0.97. Such unexpected high values reveal a rocky-type mechanical behavior that is much more akin to Earth dry landslides than to icy satellites' mass movements. This behavior indicates that 67P and likely comets in general are characterized by consolidated materials possibly rejecting the idea that they are fluffy aggregates. The variability of the runout length among 67P landslides can be attributed to the different volatile content located in the top few meters of the cometary crust, which can drive the mass movement. ©2019. American Geophysical Union. All Rights Reserved.
Database: 
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077219924&doi=10.1029%2f2019GL085132&partnerID=40&md5=56bdcded9b218e2bd64e1fc520626df3
Keywords: 
comet 67P; comet surface; landslides