A coupled phenomenon in which transient slow fault slip occurs with low-frequency seismic tremor, often near the downdip transition from locked to steadily creeping parts of a megathrust. Geodetic displacement and seismic signals provide complementary observations. Along-strike differences in recurrence, migration and cumulative slip help characterize subduction zone segmentation; tremor counts alone do not uniquely give fault slip or coupling.
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Episodic tremor and slip (ETS) is a phenomenon observed in subduction zones, particularly in regions where tectonic plates interact. It refers to a cyclical behavior of the crust that involves both low-frequency tremor and slow slip events on faults. ### Components of ETS: 1. **Tremor**: This involves the continuous release of low-frequency seismic waves. These tremors are not typically felt on the surface but can be detected by sensitive seismometers.