|Title||Reconsidering earthquake scaling|
|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||Gomberg J., Wech A., Creager K., Obara K., Agnew D.|
|Journal||Geophysical Research Letters|
|Type of Article||Article|
|Keywords||interface; mechanism; models; slow slip events; tremor|
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.