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Reconsidering earthquake scaling

TitleReconsidering earthquake scaling
Publication TypeJournal Article
Year of Publication2016
AuthorsGomberg J., Wech A., Creager K., Obara K., Agnew D.
JournalGeophysical Research Letters
Volume43
Pagination6243-6251
Date Published2016/06
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000380910100041
Keywordsinterface; mechanism; models; slow slip events; tremor
Abstract

The relationship (scaling) between scalar moment, M-0, and duration, T, potentially provides key constraints on the physics governing fault slip. The prevailing interpretation of M-0-T observations proposes different scaling for fast (earthquakes) and slow (mostly aseismic) slip populations and thus fundamentally different driving mechanisms. We show that a single model of slip events within bounded slip zones may explain nearly all fast and slow slip M-0-T observations, and both slip populations have a change in scaling, where the slip area growth changes from 2-D when too small to sense the boundaries to 1-D when large enough to be bounded. We present new fast and slow slip M-0-T observations that sample the change in scaling in each population, which are consistent with our interpretation. We suggest that a continuous but bimodal distribution of slip modes exists and M-0-T observations alone may not imply a fundamental difference between fast and slow slip.

DOI10.1002/2016gl069967
Student Publication: 
No