Recent data from the Pacific Northwest show that there are 3 distinct areas of movement above a subduction zone: 1) constant movement above the locked leading edge, 2) see-saw pattern of back-&-forth movement above a zone that alternately locks then slips in a process called episodic tremor and slip (ETS), 3) no movement far inland above the deeper part of the diving oceanic plate. ETS describes a particular type of tremor pattern observed in regions of convergent boundaries.
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