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Space‐time correlation of slip and tremor during the 2009 Cascadia slow slip event
Author(s) -
Bartlow Noel M.,
Miyazaki Shin'ichi,
Bradley Andrew M.,
Segall Paul
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl048714
Subject(s) - slip (aerodynamics) , episodic tremor and slip , geology , seismology , geodesy , space time , subduction , geophysics , physics , engineering , tectonics , thermodynamics , chemical engineering
Episodic Tremor and Slip (ETS), involving transient deformations accompanied by emergent, low‐frequency tremor occurs in subduction zones around the world. ETS events increase the shear stress on locked megathrusts and may potentially trigger damaging earthquakes. Despite the clear association of tremor and slip the physical relationship between them is unresolved. Tremor appears to result from slip on small asperities on the plate interface due to either creep on the surrounding fault, or stress increases ahead of the propagating slow‐slip front. Previous studies of migrating slow slip events have not had sufficient spatial and temporal resolution to differentiate between these two models. To address this, we invert GPS data from the August 2009 ETS event in central Cascadia for the space‐time evolution of fault slip‐rate. We find a correlation in both space and time between tremor epicenters and the independently determined position of high fault slip‐rate. This supports the first hypothesis that tremor asperities are loaded directly by slow slip, rather than by stress increases ahead of the slip front, and provides new insights into the mechanics of ETS.