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Rupture speed dependence on initial stress profiles: Insights from glacier and laboratory stick-slip

TitleRupture speed dependence on initial stress profiles: Insights from glacier and laboratory stick-slip
Publication TypeJournal Article
Year of Publication2015
AuthorsWalter J.I, Svetlizky I., Fineberg J., Brodsky E.E, Tulaczyk S., Barcheck C.G, Carter S.P
JournalEarth and Planetary Science Letters
Volume411
Pagination112-120
Date Published2015/02
Type of ArticleArticle
ISBN Number0012-821X
Accession NumberWOS:000349197500012
Keywordsantarctica; dynamics; earthquake physics; earthquakes; frictional stick-slip; ice sheet motion; ice stream; ice streams; motion; Onset; ross sea; slow slip
Abstract

Slow slip events are now well-established in fault and glacier systems, though the processes controlling slow rupture remain poorly understood. The Whillans Ice Plain provides a window into these processes through bi-daily stick-slip seismic events that displace an ice mass over 100 km long with a variety of rupture speeds observed at a single location. We compare the glacier events with laboratory experiments that have analogous loading conditions. Both systems exhibit average rupture velocities that increase systematically with the pre-rupture stresses, with local rupture velocities exhibiting large variability that correlates well with local interfacial stresses. The slip events in both cases are not time-predictable, but clearly slip-predictable. Local pre-stress may control rupture behavior in a range of frictional failure events, including earthquakes. (C) 2014 The Authors. Published by Elsevier B.V.

DOI10.1016/j.epsl.2014.11.025
Short TitleEarth Planet. Sci. Lett.
Student Publication: 
No