Space-time correlation of slip and tremor during the 2009 Cascadia slow slip event

摘要: [1] Episodic Tremor and Slip (ETS), involving transient deformations accompanied by emergent, low-frequency tremor occurs in subduction zones around the world. ETS events increase shear stress on locked megathrusts may potentially trigger damaging earthquakes. Despite clear association of slip physical relationship between them is unresolved. appears to result from small asperities plate interface due either creep surrounding fault, or increases ahead propagating slow-slip front. Previous studies migrating slow have not had sufficient spatial temporal resolution differentiate these two models. To address this, we invert GPS data August 2009 event central Cascadia for space-time evolution fault slip-rate. We find a correlation both space time epicenters independently determined position high This supports first hypothesis that are loaded directly slip, rather than front, provides new insights into mechanics ETS.